#linuxcnc Logs
Feb 05 2019
#linuxcnc Calendar
12:22 AM CaptHindsight: !fragalot
12:26 AM SpeedEvil: https://imgur.com/gallery/FbVfpKJ Accurate parts handling is awesome.
12:26 AM CaptHindsight: which one in the pea under?
12:26 AM CaptHindsight: Chinese version of 3 card monty
01:27 AM CaptHindsight: https://imgur.com/gallery/vYCRwgJ Dice dotter
01:32 AM Rab: That's cool, but how do they orient the dice for that? By hand?
01:32 AM Rab: And how does it know which side is up, and how to paint it? Machine vision???
01:34 AM CaptHindsight: I don't see any machine vision
01:35 AM CaptHindsight: lots of ways to do this, not sure what they did
01:35 AM Rab: The pin painter linked in the comments is even crazier, has to be machine vision: https://imgur.com/gallery/nyrLJT6
01:36 AM Rab: Although I guess it's possible the machine started with a wide-angle picture of the whole tray, and the head is dumb.
01:36 AM CaptHindsight: yes
01:36 AM CaptHindsight: depends on are they random or not
01:37 AM Rab: The pins have got to be random.
01:38 AM CaptHindsight: looks that way
01:38 AM * Loetmichel now has to mill 4 19" 2U front panels... out of 8mm alu... http://www.cyrom.org/palbum/main.php?g2_itemId=14769&g2_imageViewsIndex=1 <- 2 front to back of that enclosure... slightly modified for the newer system inside... THAT will take a while with a 3mm 2 flute mill bit. :-)
01:39 AM Rab: Loetmichel, do you use coolant? Ever tried 3 flute?
01:40 AM Loetmichel: nope, dry
01:40 AM Loetmichel: and no, 3flute would clog to easy
01:58 AM Loetmichel: *MUHAHA* Boss went to a customer meeting this morning in his car, really angry that the coworker that should attend also hadnt shown up... coworker just arrived: "Nope, that appointment is tomorrow!" The planning in this company sometimes...:-)
02:20 AM Deejay: moin
02:30 AM Deejay: re
04:28 AM jthornton: morning
04:29 AM XXCoder: morning
04:52 AM CNC_Brian: Guy's, Anyone know of a Python based UI for LinuxCNC I want something I can edit.
04:52 AM XXCoder: jthornton: umm is yours python based? i dont think so but..
04:54 AM jthornton: yea one sec
04:54 AM XXCoder: i need to try building a ui and learning how it works
04:54 AM XXCoder: and write a how to for machine using 3axis-tutorial
04:55 AM jthornton: https://qtpyvcp.kcjengr.com/
04:55 AM jthornton: https://github.com/kcjengr/vcp-template
04:55 AM jthornton: https://github.com/jethornton/bp_touch
04:55 AM XXCoder: you extended it since then I see :)
04:55 AM jthornton: https://qtpyvcp.kcjengr.com/tutorials/basic_vcp.html
04:55 AM jthornton: that's my tutorial
04:56 AM XXCoder: examples wow!
04:56 AM jthornton: yea I need some new screenshots I updated the bp_touch a bit yesterday
04:56 AM XXCoder: 4 new sections
04:57 AM jthornton: in the tutorial?
04:57 AM XXCoder: yea
04:58 AM jthornton: I have another section to do I just thought of
05:01 AM XXCoder: cool :)
05:01 AM XXCoder: do you change ini to use whatever ui want to use?
05:01 AM XXCoder: for example its using axis, and i want to change to bp_touch
05:05 AM jthornton: yea, once you install a ui you just change one line in the ini to switch
05:05 AM XXCoder: nice. thanks
05:05 AM jthornton: CNC_Brian: that bp_touch ui took me an hour to make
05:06 AM jthornton: https://qtpyvcp.kcjengr.com/configuration/ini_options.html
05:06 AM XXCoder: do you know how to add notes to youtube? I need to change rolfmill to 3axis_tutorial in video lol
05:06 AM jthornton: no, been a long time since I posted a putube video
05:07 AM XXCoder: drat ok
05:07 AM CNC_Brian: Thanks, Will take a look
05:18 AM Loetmichel: *gnhihi* just cut off a 500mm by 110mm strip of a big 1000mm by 500mm 8mm thick Alu slab. With a scroll saw. That poor thing now smells badly like hot enamel... $me should really get a "cold saw" (slow circular saw) for metal for the company... that takes AAAGES.
05:19 AM Tom_L: morning
05:19 AM XXCoder: lol
05:19 AM XXCoder: hey
05:22 AM Tom_L: Loetmichel i found it easier to cut with a .125 em than a jig saw although i've cut 5/8 with one
05:23 AM Tom_L: you use what ya got
05:23 AM Tom_L: get a midsize bandsaw for cutoff
05:23 AM rmu: Loetmichel: get a band saw
05:44 AM XXCoder: walls of my room is as cold as outside.
05:44 AM SpeedEvil: Loetmichel: Or, well, a hacksaw
05:52 AM Loetmichel: SpeedEvil: i have a hacksaw. no chance to do a 500mm long cut with that
05:53 AM Loetmichel: unless you mean a naked hacksaw blade with some tape around for a handle
05:53 AM SpeedEvil: Loetmichel: you don't know how to use a hacksaw.
05:53 AM SpeedEvil: Loosen hacksaw blade, rotate 90 degrees.
05:54 AM SpeedEvil: Oh - I misread.
05:54 AM Loetmichel: still wont fit
05:54 AM SpeedEvil: I thought you wanted an 8mm strip.
05:54 AM XXCoder: lol
05:54 AM SpeedEvil: hacksaws with 110mm clearance are rarer
05:54 AM Loetmichel: the hacksaw has less than 100mm between blade and "bow"
05:55 AM Loetmichel: no, i need to make 4 of those fronts and backs and the 500*1000mm material dosent fit the CNC mill: http://www.cyrom.org/palbum/main.php?g2_itemId=14769&g2_imageViewsIndex=1
05:55 AM Loetmichel: 2 fronts and two backs
05:55 AM Loetmichel: so i have to cut it to "rough size" beforehand
05:56 AM Loetmichel: wich is a task in itself for 8mm thick sheet alu if you dont have the correct tool
05:59 AM SpeedEvil: For rough size in 8mm aluminium, any circular saw will work fine IME.
06:14 AM Tomoe: How are you gentlemen!!
06:14 AM XXCoder: move the zigs!!
06:14 AM XXCoder: seriously the zigs is on way of my battleships.
06:15 AM Tomoe: is this channel for cnc stuff only or for manual machining as well
06:15 AM Tomoe: ?
06:17 AM XXCoder: honestly we talk a lot about stuff thats not purely cnc
06:20 AM jthornton: don't forget we talk about chickens too :)
06:20 AM Tomoe: I'm trying to find more info about a lathe/mill thingy
06:21 AM Tomoe: and don't know where to look
06:22 AM Tomoe: https://www.2ememain.be/bricolage-construction/machines-appareils/tours/av-tours-fraiseuse-493178108.html
06:22 AM Tomoe: ^^^^ dis
06:26 AM SpeedEvil: First obvious step would be if there is a nameplate somewhere, I don't see one
06:26 AM Loetmichel: SpeedEvil: circular saw would work, been there done that... just that the company doesent own one... and i have NO idea where my private circular saw went
06:26 AM Loetmichel: cant find it
06:27 AM Loetmichel: so the scroll saw we have at the company was the only option
06:28 AM Loetmichel: angle grinder would have worked, too, but would probably need more grinding disks than i have at hand here (clogging, not using them up)
06:28 AM Tomoe: SpeedEvil: yeah went through that step already, seller says no info re: manufacturer/model#
06:29 AM SpeedEvil: I almost wonder if it's some bastardised cut+shut job
06:31 AM Tomoe: watumean
06:31 AM XXCoder: custom job.
06:32 AM SpeedEvil: Someone has sliced off parts of various machines and welded them together.
06:32 AM Tomoe: lol
06:32 AM Tomoe: because it seems complex?
06:32 AM Tomoe: I mean it's like
06:32 AM Tomoe: halfway between a universal mill and a mill/lathe combo
06:33 AM Tomoe: but anyho
06:33 AM SpeedEvil: A perjorative term applied to low-skilled vehicle remanufacture taking two broken cars and putting them together.
06:33 AM Tomoe: you guys know of a better place to ask
06:33 AM Tomoe: ?
06:33 AM SpeedEvil: Not off-hand. Wait aroind, someone might have a suggestion
06:54 AM jthornton: looks like some special machine like making gears or something
06:56 AM Loetmichel: SpeedEvil: in german: "aus zwei mach eins"
06:56 AM Loetmichel: :-)
06:57 AM Loetmichel: oder auch "aus drei mach eins"... one of my uncles did that back in the days with Renault R4 and R6
06:57 AM Loetmichel: ... infamous for already having rust when fresh out of the factory
07:14 AM jdh: that one look kinda cool
07:53 AM PL7icnc: Hi
07:53 AM PL7icnc: some Admin of the Forum Here
07:54 AM PL7icnc: Does someone Know if i can PM the Admins or MOd
07:58 AM PL7icnc: hi Samiam1999
07:58 AM PL7icnc: hi samsagaz
08:02 AM jthornton: yea
08:03 AM PL7icnc: jthornton, Hi
08:03 AM PL7icnc: is there some Help on the Forum
08:03 AM samsagaz: hi PL7icnc
08:04 AM PL7icnc: SMILE
08:04 AM PL7icnc: im n bright Sunshine Germany
08:04 AM PL7icnc: and siting in Office awaiting Workend
08:05 AM PL7icnc: i did Start to Upload the ICH... Videos https://www.youtube.com/channel/UCGuJsIoXW-exBAwdn38dXow/videos
08:07 AM PL7icnc: jthornton, i do not see Somthing like PM on the Forum sides
08:07 AM PL7icnc: Pages
08:08 AM JT-Shop: the forum does not have PM
08:09 AM PL7icnc: What is Connections
08:09 AM PL7icnc: Connection Pending Acceptance!
08:13 AM PL7icnc: Q: shoudt i start a Stand alone English Channel for ICH... Enlish Videos or Mix up with the German yhannel
08:14 AM JT-Shop: that's up to you
08:16 AM PL7icnc: As i SEE Lots of things got changed since 10.04 Linuxcnc 2.4.5
08:17 AM JT-Shop: yea quite a bit has been improved :)
08:18 AM PL7icnc: the Halui Renaming is giving mee some trouble
08:18 AM PL7icnc: as it is only remaining the Standard Files
08:18 AM PL7icnc: and Ich did alotoff its own Naming
08:29 AM PL7icnc: I'am Leaving
09:23 AM rmu: seems my vers tool setter let out the magic smoke
11:08 AM gp5st: is anyone familar with a channel for discussing (the non-digital hardware parts of a) cnc builds?
11:11 AM * ziper looks around
11:11 AM gp5st: I didn't know if that was verboten on this channel, and I didn't see any good candidates in the freenode channel list
11:14 AM cradek: it's perfectly fine
11:20 AM fragalot: Hi
11:22 AM gp5st: what i'd been thinking about is building a sort-of hybrid cnc/hc (computer and human controlled) machine in phases ontop of my wood working bench, primarily for use some repetitive cuts, fast positioning, and to help with me keeping the router straight on long cuts. So, I know it's probably a dumb idea as guides would be cheaper (but less ridgid). To make it even more dumb, my current plan was to have the entire gantry move up
11:22 AM gp5st: and down ~4' (as opposed to just something holding the router). That's a bit more heavy and I was planning on counterweighting it sort of like an elevator. The stupidity in that height of a z-axis is so that it's out of the way when i'm not using it. Thoughts on if i'd be able to maintain enough rigidity for woodworking tasks, say 1/16-1/32"? or is this just a fools errand and I should just stop where I am?
11:23 AM fragalot: depends on the size of the column
11:23 AM fragalot: but generally speaking, any error or deflection you may have will be amplified over 4'
11:23 AM fragalot: for what you want, you may be better off with something like this https://www.shapertools.com/
11:24 AM fragalot: (i have no idea if it's any good, but it looks fun)
11:26 AM gp5st: it does look fun! but part of what I need/want is to be able to cut notches on the side of wood, where normally you'd just run it over a router table, here the router would need to be suspended to not have to use a ton of extra stock to get it to sit right
11:26 AM fragalot: couldn't you just clamp some scrap stock to it?
11:26 AM gp5st: i could, but it ends up being a lot of stock to support the base of the router
11:26 AM fragalot: true
11:27 AM gp5st: (or i could just build a router table for those types of tasks, but when have I ever been sensible?)
11:27 AM fragalot: lol
11:27 AM gp5st: well, the other part that a router table isn't going to work for is when I need to notch the end of a board
11:28 AM gp5st: normally you'd clamp it to the side of bench and use a jig to support the router and line everything up
11:28 AM fragalot: big pantorouter? :D
11:28 AM gp5st: but then it just always seems like it's $$ for this, $$ for that, $$ for another jig, so I was just considering a large cnc-style control system for it
11:29 AM gp5st: fragalot, that actually might be a better idea ^_^ I'll have to think more about that, and maybe watch matthais' (sp?) videos again
11:30 AM gloops: moving the Y axis (gantry) up and down, hmm, possible
11:30 AM gloops: but one of those things where there are likely less complicated solutions
11:30 AM gloops: unless you just have this thing on your mind and want to do it anyway
11:31 AM gp5st: gloops, yeah, I just....don't have the confidence that I could build a router support z-axis with enough rigidity for a big router on a heavy cut
11:31 AM gp5st: maybe there is a better way :-\
11:31 AM fragalot: if you make the column 2' wide it would work fine
11:32 AM gp5st: yeah, i had no intntion of trying to make the columns of the gantry small
11:32 AM gp5st: but maybe not 2' :D
11:33 AM gloops: dont happen to be in the UK gp5st?
11:33 AM gp5st: i was thinking more along the lines of 6"-8" wide for the column
11:33 AM gp5st: gloops, no, usa
11:33 AM gloops: i saw something on ebay
11:34 AM gloops: https://www.ebay.co.uk/itm/Trend-Elu-Combination-Router/283355231024?
11:35 AM gp5st: oh interesting
11:35 AM gloops: to raise the gantry id just have it on linear rails - 2 screws, leadscrews are fine, join the screws with a belt or chain, wind gantry up and down
11:36 AM gp5st: I was considering a moving table design, but was again concerned with the rigidity of the arm (and that it 4x the area of the required footprint for a given working area)
11:36 AM gloops: youd need a welded beam accross the top
11:36 AM gp5st: that was the plan basically
11:37 AM gloops: it would work
11:39 AM * gp5st ponders
11:39 AM gp5st: thanks :)
11:42 AM gloops: the bottom of the uprights will be locked by the ballscrews driving the gantry along X, the top will be held by a welded or well bolted beam,
11:47 AM gp5st: that's the idea, yes
12:03 PM gloops: well, ive got 2 weeks to play after this thursday
12:04 PM gloops: just got a fence to fit to my upright work surface mkii, and i might get round to swapping 2 motors for bigger ones
12:06 PM gloops: 1 year after starting this thing might actually get into production
12:09 PM gp5st: :D
12:17 PM Tom_L: what's up gloops
12:17 PM Tom_L: mill still runnin good?
12:21 PM gloops: yeah still working fine Tom_L im just finishing a job off then im back on the cnc project
12:22 PM Tom_L: you were making a log saw too weren't you?
12:22 PM gloops: i think this customer ive been on with for months is finally broke lol
12:22 PM Tom_L: time to move on..
12:23 PM gloops: yeah the bandsaw works ok, ive cut some slices off 12 inch logs with it, a bit of tweaking and tidying up to do with it but basically it works
12:24 PM gloops: are you doing much with your mill Tom_L?
12:24 PM Tom_L: i did a little job the other day
12:25 PM Tom_L: some goober at the vo'tech my kid goes to wanted me to do one for him
12:25 PM Tom_L: he got a quote for $6k by a shop and wanted me to do it
12:25 PM Tom_L: i took one look at it and sent him down the road
12:25 PM fragalot: lol
12:26 PM gloops: too awkward or something?
12:26 PM Tom_L: horrible design
12:26 PM Tom_L: some sword / knife you wear on your wrist i guess
12:26 PM Tom_L: they tried to 3d print it for him and gave up
12:26 PM Tom_L: it wouldn't render
12:26 PM Tom_L: probably a dozen or more parts
12:27 PM Tom_L: the kid has no concept of machining or how to
12:27 PM gloops: suppose it depends how much he was willing to pay
12:27 PM fragalot: ._.
12:27 PM Tom_L: not worth my time
12:27 PM Tom_L: now he thinks he's gonna have it 3d metal printed
12:28 PM fragalot: offer consultancy for 5k to design it to be printed for under 500.
12:28 PM Tom_L: i've got all the files
12:28 PM fragalot: still 500 better than their previous quote.
12:28 PM Tom_L: heh
12:30 PM gloops: https://vignette.wikia.nocookie.net/hohrpgseries/images/9/9a/Wrist_Blade.jpg/revision/latest?cb=20091009042731
12:30 PM gloops: just googled wrist knife out of curiousity
12:31 PM Tom_L: this is alot more complicated
12:31 PM gloops: doesnt look like the typical camping implement
12:31 PM Tom_L: no
12:31 PM Tom_L: something you'd find in some video game
12:31 PM fragalot: furze made a nice one
12:34 PM Tom_L: he insisted it be made from damascus steel or titanium :D
12:34 PM fragalot: lol
12:35 PM Tom_L: i doubt he knows much about either
12:36 PM fragalot: well, damascus is just inferior steel that looks pretty
12:37 PM gloops: they make some nice blades on the facebook group
12:37 PM gloops: bike chains, all kinds of stuff they hammer out
12:43 PM fragalot: the boring head I ordered last year is still stuck at customs >.>
12:44 PM gloops: from china?
12:47 PM fragalot: ukraine
12:48 PM fragalot: a Kaiser PA
12:52 PM fragalot: https://i.ebayimg.com/images/g/wy0AAOSwy2pcHgyp/s-l1600.jpg
12:52 PM fragalot: swiss made boring & facing head. I'm quite looking forward to it
12:55 PM gloops: that does look very nice actually
12:56 PM fragalot: you could get this one for your router: https://www.ebay.co.uk/itm/Kaiser-Type-G-Automatic-Boring-Facing-Head-VGC-With-Manual-BIG-L-K/392220652152?hash=item5b522c3278:g:1yYAAOSw4SxcRjgG:rk:4:pf:1&frcectupt=true
12:58 PM rmu: this thing is probably heavier than your typical cheese-grater-router
12:59 PM fragalot: :D
01:00 PM rmu: also, max rpm of the boring head is smaller than min rpm of the router spindle
01:01 PM fragalot: by quite a large margin, lol
01:02 PM fragalot: ha. another 130 million euro worth of bitcoin lost forever
01:02 PM rmu: fragalot: report on vers probes will have to wait. magic smoke escaped from a LDO. will need some SMD fixing under the microscope
01:05 PM fragalot: ._.
01:05 PM fragalot: that's not a good start
01:07 PM gloops: routers dont need a boring head
01:07 PM gloops: especially not boring heads worth more than the router lol
01:07 PM rmu: no. it seems there is an issue when the pull-up on the output gets voltage before the internal power supply is stable. but not sure.
01:07 PM fragalot: of course they do
01:07 PM fragalot: how else are you going to fit dowels
01:07 PM rmu: routers are boring
01:08 PM gloops: routers are the machines that make dreams into reality
01:08 PM gloops: milling machines make parts
01:08 PM gloops: usually for other machines
01:08 PM fragalot: rmu: have had issues similar to that before when using shitty power supplies
01:09 PM fragalot: power didn't stabilize very well at the start, messing up internal ADC calibrations
01:09 PM fragalot: was resolved by holding the cpu in sleep for the first second after power up >.>
01:09 PM rmu: the 24V is not the issue
01:10 PM rmu: the output-fet is also blown
01:11 PM fragalot: :/
01:11 PM rmu: (open)
01:11 PM gloops: https://www.ebay.co.uk/itm/Schmid-Boring-Head/113614164721?
01:11 PM rmu: which i find odd, i have more "experience" with the permanently-shorted-type-of-FET
01:11 PM gloops: german..but probably works
01:12 PM fragalot: rmu: pot luck. :-)
01:12 PM fragalot: I like the description
01:12 PM fragalot: "comes with Happy bidding"
01:14 PM quqnuss: hello everyone :-)
01:15 PM gloops: evening
01:16 PM quqnuss: hey gloops .. remember me from yesterday ? :-)
01:16 PM quqnuss: I was asking somthing about five axes cnc
01:17 PM gloops: yes we were all poised to ponder your questions quqnuss
01:18 PM quqnuss: :-D .... so basically I am getting more noobed by trying to understand, how to setup (and control, obviously) a five axes ..
01:19 PM quqnuss: should the xyb on c or cb on xy bead ?
01:19 PM quqnuss: is there any difference at all ?
01:19 PM rmu: the controller is probably the easiest thing of it
01:20 PM quqnuss: controller ?!$%& you mean stepper controller ?
01:20 PM gloops: the mechanical build quqnuss?
01:20 PM quqnuss: yes .. mechanical build
01:22 PM rmu: quqnuss: mechanical build and actually generating toolpaths is way more challenging than controlling 5 motors.
01:22 PM rmu: IMHO
01:22 PM gloops: https://www.ebay.co.uk/itm/5-Axis-CNC-3040-Table-Column-Type-Engraving-Machine-High-pricision-Ball-Screw-/251354779186
01:22 PM quqnuss: exactly rum
01:22 PM quqnuss: that is my concern
01:22 PM gloops: i suppose there are pros and cons for various designs
01:23 PM fragalot: that price is ridiculous
01:23 PM gloops: that seems to be the favoured approach
01:24 PM quqnuss: you are right gloop
01:24 PM quqnuss: or the other possibility would be to move whole xy and c on a (or b)
01:25 PM gloops: the A axis is well, an A axis, youve only got to add another rotary to it
01:26 PM gloops: any pic of that quqnuss?
01:26 PM quqnuss: so, you guys think, both approaches would be same at the end
01:26 PM fragalot: quqnuss: you can configure it however you want, it all depends on what you intend to make and what fits best
01:26 PM gloops: if you start rotating the spindle you might need to consider the loss of travel in other axis
01:27 PM quqnuss: hmm
01:27 PM quqnuss: ok .. here is what i actually want
01:27 PM fragalot: heck, some make it even more complicated and put the axis on a 45° offset
01:28 PM fragalot: like the DMU 60 eVo linear
01:28 PM quqnuss: I want to make some design on a circular ring .. say, like wedding ring, but 2 inch dia :-)
01:30 PM gloops: hmm
01:30 PM quqnuss: X and Y would more laterally ..
01:30 PM gloops: so the profile of the ring is not flat, you want to project a design onto the curved surface of a ring
01:30 PM quqnuss: right
01:31 PM gloops: it seems instinctive to tilt the spindle for that with an A axis
01:31 PM fragalot: standard XYZ spindle movement, with a standard stacked rotary would be the easiest
01:31 PM quqnuss: sure fragalot
01:31 PM fragalot: tilting the spindle is also possible, but a little harder to do as it adds a lot of mass to the thing you want to move quickly
01:32 PM quqnuss: and have to handle any possible vibration generated by hi speed spindle ..
01:32 PM fragalot: yes
01:32 PM quqnuss: hmm ..
01:33 PM fragalot: where-as if you have the 2 rotary axis mostly stationary, they can be a lot beefier without compromising speed too much
01:33 PM quqnuss: I have already built a prototype A and B rotaries on XY
01:33 PM gloops: i dont like the double rotary for this
01:33 PM quqnuss: Z is stationary as usual
01:34 PM gloops: im not sure you will get the angle for one side of the ring
01:34 PM fragalot: gloops: you'd face that same problem regardless of how you tilt the axis
01:35 PM quqnuss: If the ring moves like a wheel .. it has to rotate on sides to get a curve on the surface .. that is my understanding
01:35 PM gloops: not with just a normal A axis and a spindle that tilts, you can get both sides of the ring
01:35 PM fragalot: the only difficulty is spindle clearance to the fixture
01:36 PM fragalot: regardless of what moves, that problem remains the same
01:36 PM quqnuss: how can I share the pic of my crude proto ?
01:36 PM fragalot: imgur.com
01:36 PM quqnuss: hmm wait ..
01:36 PM gloops: http://www.mfgnewsweb.com/archives/imts_south_hall_prod_prev/aug16/pics/Chevalier-IMTS-2.jpg
01:36 PM gloops: he cant get to the back of that disc at an angle
01:37 PM gloops: have to turn it over
01:37 PM fragalot: yes, how would tilting the spindle reach it?
01:37 PM fragalot: it's still going to hit that same big chuck / faceplate / fixture
01:38 PM rmu: you want something like a millturn
01:38 PM fragalot: I do love me a good millturn
01:38 PM rmu: a big one
01:38 PM fragalot: wouldn't mind having a "little" mazak like edge precision uses
01:38 PM fragalot: the only problem is that the toolchanger alone is bigger than my whole workshop
01:39 PM rmu: https://www.wfl.at/fileadmin/user_upload/loesungen/millturns/M200-TECH_370.jpg
01:39 PM rmu: hehe
01:39 PM rmu: walk-in tool magazine
01:39 PM rmu: that boring bar in the picture is insane
01:40 PM gloops: fragalot not if the ring is mounted on an A axis along which the Z can travel with a spindle tilting both ways
01:42 PM quqnuss: +brb
01:42 PM gloops: like this http://www.centroidcnc.com/images/cnc_cylinder/2013_a560_1200.jpg
01:43 PM fragalot: gloops: the only difference I see is that the fixturing is made a lot smaller, and the ring would be mounted on a slim arbor
01:43 PM gloops: that can find both sides of the cylinder, at say 45 and 135
01:43 PM fragalot: but, this would indeed be more rigid than a single arbor sticking out as it can be supported on 2 ends
01:44 PM gloops: and ill leave the g-coding to someone else lol
01:44 PM fragalot: rmu: I think that boring bar is one of sandvik's silent series (or something like that)
01:46 PM fragalot: should go up to 14xD iirc
01:47 PM rmu: i'm happy with 5mm holes 30mm deep in aluminium...
01:47 PM fragalot: they make mill arbor extensions too
01:48 PM gloops: im assuming the non-trivial kinematics for these standard designs are already out there
01:48 PM fragalot: I'm also pretty sure that one boring bar costs more than my mill does
01:50 PM rmu: :)
02:02 PM CaptHindsight: hah, tried getting a rate quote on parcelmonkey.com to Pakistan...
02:03 PM CaptHindsight: 168lb (76kg) $9697 USD
02:05 PM Tomoe: lol
02:05 PM gloops: that would buy a casino in pakistan
02:08 PM CaptHindsight: UPS air freight is only $430
02:10 PM CaptHindsight: i think that site has some deal with DHL slow boat service, rates are 50% of anything else but everybody complains it take as long as 6 weeks to arrive
02:12 PM CaptHindsight: waiting to see pics of the proto machine by quqnuss
02:13 PM MacGalempsy: good afternoon
02:13 PM quqnuss: almost done
02:13 PM fragalot: CaptHindsight: long live shipping stuff
02:14 PM gloops: thing is you are only coming in along the axis of the cylinder, a pod would give radial angles
02:17 PM CaptHindsight: MacGalempsy: have you returned to civilization or is the internet onsite gotten much better :)
02:17 PM gloops: gyro axis hexapod
02:17 PM MacGalempsy: hahaha. I run an office in OKC now =)
02:18 PM MacGalempsy: we moved back to OKC in August, but just getting the toys unpacked
02:18 PM CaptHindsight: did you dog up any dinosaurs while you were down there? :)
02:18 PM CaptHindsight: dog/dig
02:18 PM quqnuss: PLEASE forgive me for such a childish proto pic , but it is just to see, how can I move my theoretical toy ..
02:18 PM quqnuss: https://imgur.com/a/Id0VrCE
02:19 PM quqnuss: waiting for firing squad :-)
02:20 PM CaptHindsight: too abstract for me this early
02:21 PM quqnuss: hmm
02:21 PM gregcnc: what is the function of the linear axis mounted to the rotary?
02:21 PM quqnuss: so that the ring's surface could be adjusted according to its radius
02:21 PM fragalot: guessing it is to offset the ring he wants to machine to reduce the travel needed from the rest of the machine
02:22 PM quqnuss: exactly
02:22 PM gregcnc: that would require calibration every time it was changed
02:22 PM fragalot: indeed it would
02:22 PM quqnuss: sure ..
02:22 PM gregcnc: just build it bigger
02:22 PM MacGalempsy: no dinos, but we find invertebrates pretty often
02:23 PM fragalot: its the vertebrates you have to watch out for
02:24 PM quqnuss: if I try to manage those variable slides via lcnc .. would those be called another axes ? a seven axes thing ?!
02:24 PM quqnuss: current plan is not to, btw.
02:24 PM gregcnc: I don't see the need 5 is enough unless there is a real reason a larger machine isn't possible
02:25 PM MacGalempsy: it makes me laugh that ppl are trying troubleshoot their 3D printer problems with facebook posts
02:25 PM gloops: never be rigid enough for metal
02:26 PM CaptHindsight: did I miss a pic of the part trying to be made with this multiaxis machine?
02:26 PM fragalot: no
02:26 PM quqnuss: the black ring would be
02:26 PM CaptHindsight: walked in late
02:26 PM quqnuss: marked as "supposed Ring"
02:26 PM gregcnc: the other issue is always what are you programming 5axis with?
02:27 PM quqnuss: a million dollar question ..
02:27 PM quqnuss: :-D
02:27 PM gregcnc: answer it first
02:27 PM CaptHindsight: NX CAM, MasterCAM
02:28 PM fragalot: jog wheel
02:28 PM CaptHindsight: does fusion360 do 4+ axis CAM?
02:28 PM fragalot: yes
02:28 PM gregcnc: $50 machine, $20,000 software
02:28 PM CaptHindsight: never used Fusion
02:28 PM syyl: yes it does
02:28 PM fragalot: fusion is great for CAM if you don't mind the cloud
02:28 PM quqnuss: $50 is not reallistic
02:28 PM gregcnc: fusion does some things, you have to be sure it's capable
02:28 PM syyl: but you wont have a postprocessor for a random machine
02:28 PM fragalot: evening syyl
02:28 PM syyl: ahoi
02:28 PM gloops: 4 axis indexing is around, its the 5th
02:29 PM fragalot: our 'new' deckel arrived
02:29 PM syyl: yay
02:29 PM syyl: does it work?
02:29 PM fragalot: still getting used to heidenhain controls
02:29 PM fragalot: it does work
02:29 PM fragalot: the table was even resurfaced by FPS 2 years ago & looks absolutely spotless
02:29 PM CaptHindsight: I have a few heidenhain controls here, never use them
02:30 PM syyl: cant go wrong with FPS
02:30 PM syyl: a lot of ex-deckel personel there
02:31 PM fragalot: :)
02:31 PM gloops: however quqnuss this build might be about working out the principles and testing etc
02:31 PM gloops: you will learn from it
02:31 PM quqnuss: that is the main point
02:31 PM gregcnc: is there something about existing designs that isn't suitable for this?
02:31 PM CaptHindsight: isn't there a 5-axis SIM in LCNC?
02:32 PM quqnuss: as I said .. I am pretty noob in lcnc ..
02:32 PM fragalot: CaptHindsight: I spent some time trying to get it to work before figuring out you had to clear the "power interrupted" message using the CE button rather than "clear all errors"
02:32 PM fragalot: that took me a few hours
02:32 PM fragalot: it's the little things, really
02:32 PM CaptHindsight: yes
02:32 PM CaptHindsight: have done similar
02:32 PM syyl: CE is your magic button ;)
02:32 PM fragalot: but.. at least all screws in the electrical cabinet have been tightened, lol
02:33 PM CaptHindsight: start with the simple and most likely first
02:33 PM fragalot: spindle also wouldn't run for some reason until you send "STOP" via the MDI first... except now that I try running it again it always JustWorks
02:33 PM syyl: do you have to hold NC start button after powerup to reset the e-stop on that controll?
02:33 PM fragalot: syyl: push it twice
02:33 PM fragalot: that also took me a while
02:33 PM CaptHindsight: ever have a customer call in frantic with all sorts of error codes and theories?
02:34 PM fragalot: CaptHindsight: yes, going to one on monday.
02:34 PM syyl: ah
02:34 PM CaptHindsight: and it's obvious it's something simple like power is out
02:34 PM syyl: on ours you had to hold it :D
02:34 PM fragalot: even if a system has been running for 5 years, it's NOT the pump that needs servicing, it's obviously a software bug.
02:35 PM gregcnc: capthindsight how bad is the icestorm going to be?
02:35 PM CaptHindsight: gregcnc: haven't heard, what day?
02:35 PM fragalot: syyl: :D
02:35 PM gregcnc: tonight
02:36 PM CaptHindsight: all salted by 7am
02:36 PM MacGalempsy: CaptHindsight: you can download Fusion360 for free. just trial it as a hobbyist
02:37 PM CaptHindsight: MacGalempsy: I have heard of it but I have NX and MasterCAM
02:37 PM fragalot: or trial it as a company for free for the first time
02:37 PM MacGalempsy: there is an emc2 post processor. Andy is a magician on it
02:37 PM gregcnc: but you actually have to use it to know what it will do. I've had a license for 3 years maybe?
02:37 PM syyl: i want to break myself free from fusion
02:37 PM syyl: the cad side annoys the heck out of me
02:37 PM CaptHindsight: I never got the hang of autoCAD either
02:38 PM quqnuss: If you guys could suggest me, which software should I use to make tool path, just to see if the toy is moving accordingly ? like to make a curved surface on a ring ?
02:38 PM gregcnc: does the basic post even include 4th axis?
02:38 PM gloops: g-code ripper wraps, youd just have to pick the the lines and stick the B angles in as and when required
02:38 PM CaptHindsight: I tried Inventor once and went back to NX, SW, Catia, Creo etc
02:38 PM gloops: pick through the lines
02:38 PM CaptHindsight: not the same
02:38 PM syyl: gregcnc, it has posts for a whole lot of 4 and 5 axis machines
02:38 PM fragalot: and you can make your own
02:38 PM gregcnc: syyl yes of course, but for linuxcnc?
02:38 PM MacGalempsy: when I took a gcode class, the instructor spent the last week with solidworks and said all the stuff we learned would likely not be used too much. lol
02:39 PM fragalot: syyl: we're using autodesk HSM.. because apparently we've been paying licenses for it for the past decade or so & nobody actually seemed to use it until now as they all used mastercam >.>
02:39 PM gregcnc: macgalempsy, you'll be glad to have some clue when the post makes bad code
02:39 PM syyl: good luck with that gregcnc ;)
02:40 PM syyl: you will have to modify something else with more than 3 axis
02:40 PM fragalot: MacGalempsy: great way to end, haha
02:40 PM MacGalempsy: it has been a few years since my machine ran last. at that point Fusion360 was not continuous 4 axis. I wonder if it has cha
02:40 PM gregcnc: there is a guy on YT with Siemens to 5 axis Linuxcnc with TCP
02:42 PM gloops: ill do a 5 or 6 one day, too much other atm
02:42 PM MacGalempsy: they said the framework for fusion was something that could handle 4 and 5 axis, but the programming end hadn't been done
02:43 PM fragalot: I believe it can do at least 4+1 axis work
02:43 PM MacGalempsy: I still need to get rid of this damn edm... anyone interested?
02:43 PM fragalot: and I want to say 5 axis continuous but never done that myself so I won't :D
02:43 PM gregcnc: yes it can, but many people seem unhappy
02:43 PM gregcnc: or are tired of waiting
02:43 PM fragalot: MacGalempsy: depending on size, and whether or not you deliver it for free. :P
02:44 PM MacGalempsy: where are you fragalotm
02:44 PM MacGalempsy: ?
02:44 PM gregcnc: lol
02:44 PM fragalot: Belgium
02:44 PM MacGalempsy: hahahahaa
02:44 PM fragalot: :D
02:44 PM MacGalempsy: it's on a trailer, and prices to sell
02:44 PM fragalot: is this where you happen to live around the corner and i'm now stuck with an edm?
02:44 PM fragalot: oh good. :D
02:45 PM MacGalempsy: kind of, we moved and no place to set it up
02:45 PM MacGalempsy: 110v 30A sinker EDM
02:46 PM MacGalempsy: https://oklahomacity.craigslist.org/tls/d/oklahoma-city-hansvedt-201e-edm-tooling/6797330656.html
02:46 PM MacGalempsy: the finish quality is pretty awesome due to the lower power setting
02:46 PM fragalot: that's one way to say it's underpowered
02:47 PM MacGalempsy: built to fit
02:47 PM fragalot: good luck selling it, wrong end of the world for me :)
02:48 PM MacGalempsy: thanks, I beed
02:48 PM MacGalempsy: I would trade it to so.
02:48 PM MacGalempsy: someone who would get my tool changed and 4th axis 100%
02:49 PM MacGalempsy: chamger
02:49 PM fragalot: what's wrong with them?
02:50 PM MacGalempsy: tuning and coding
02:52 PM gregcnc: the little benchman?
02:52 PM MacGalempsy: yeah.
02:54 PM MacGalempsy: its sitting in my mother-in-law's garage until my garage is cleaner.
03:01 PM Joe_Hildreth: Hello all.
03:02 PM Joe_Hildreth: Can someone point me to PDM spindle control for dummies? I understand how PWM works, but not finding anything that explains PDM in a way that makes sense to me. Any suggestions?
03:03 PM CaptHindsight: it's similar
03:03 PM CaptHindsight: pulse width vs pulse density
03:04 PM CaptHindsight: pulse width varies vs set pulse width but more or less frequent
03:05 PM CaptHindsight: Joe_Hildreth: https://forum.linuxcnc.org/16-stepconf-wizard/28510-using-pdm-mode-for-spindle-control
03:06 PM Joe_Hildreth: So it works like FM radio, but instead of audio shifting the frequency, some preset range shifts the frequency. Correct?
03:06 PM CaptHindsight: yes
03:07 PM CaptHindsight: https://wapl.es/cnc/2015/12/04/huanyang-linuxcnc-2.7-speed-control.html
03:08 PM Joe_Hildreth: OK, that was sort of where I was leaning. Will read the post you linked too. Now, in FM radio you have a base carrier frequency and it is modulated by the audio. For driving a spindle, what serves as the base carrier? Half the servo thread frequency?
03:08 PM CaptHindsight: heh, ignore that last link
03:08 PM CaptHindsight: they tried PDM and then used serial
03:09 PM CaptHindsight: Joe_Hildreth: which VFD are you using?
03:09 PM Joe_Hildreth: I am trying to finish up my next tutorial, but want to make sure I have a grasp on PDM before I finish.
03:10 PM Joe_Hildreth: CaptHindsight: I am not using one. Just covering the stepconf wizard for a turorial and am trying to get an idea of how it works so I can give a five mile flyover of it.
03:11 PM gregcnc: the manual of a drive which has frequency input in addition to 0-10V, 4-20mA input signals would be best source
03:11 PM Joe_Hildreth: gregcnc: Could you point me to one? No idea what I am looking for really.
03:15 PM CaptHindsight: https://en.wikipedia.org/wiki/Pulse-density_modulation
03:16 PM rmu: i would not say that PDM modulates a frequency
03:16 PM CaptHindsight: no, it's not FM
03:17 PM CaptHindsight: but he's starting to get it
03:19 PM Joe_Hildreth: rmu: so PDM runs at a set frequency like PWM? I was under the impression that the frequency changed to represent a different analog value.
03:19 PM CaptHindsight: Joe_Hildreth> So it works like FM radio, but instead of audio shifting the frequency, some preset range shifts the frequency. Correct? Frequency of a preset pulse width, width doesn't change but how often it occurs changes with amplitude of the modulating signal
03:19 PM CaptHindsight: https://en.wikipedia.org/wiki/Pulse-density_modulation#Examples
03:19 PM CaptHindsight: graphical example ^^
03:20 PM CaptHindsight: every pulse is the same width
03:20 PM CaptHindsight: how often a pulse occurs varies
03:21 PM rmu: Joe_Hildreth: so if you imagine PWM that counts to 100 and then starts over at 0, and that counter runs at 100khz, then you can (simplified) output 100 different voltages with 1khz update rate
03:22 PM rmu: in a PDM, you would decide each counter tick of the 100khz counter if the next pulse is 0 or 1 whereas in PWM you count to e.g. 50 for 50% and then set output to 1 and reset at 100/0
03:22 PM Joe_Hildreth: CaptHindsight: Been looking at the wikipedia page. Still digesting it.
03:22 PM gregcnc: I was headed down the wrong path
03:23 PM CaptHindsight: Joe_Hildreth: thick of a picket fence with all the same size pickets but...
03:23 PM CaptHindsight: you vary the spacing between them
03:23 PM rmu: in integer multiples of picket sizes
03:24 PM CaptHindsight: say, touching each other = 100%, 3 feet apart = 0%
03:25 PM CaptHindsight: 1.5 feet apart = 50%
03:26 PM CaptHindsight: the pulse are at a much higher frequency than the modulation
03:26 PM rmu: 0% would be infinite distance. 1.5 feet apart = 50% implies 1 foot pickets.
03:26 PM Joe_Hildreth: CaptHindsight: so we are counting the pickets over a predefined distance, then starting over for another predefined distance. The number of pickets in the distance translates into some analog value?
03:26 PM rmu: 0% would be infinite distance. 1.5 feet apart = 50% implies 0.75 foot pickets.
03:26 PM rmu: hehe
03:26 PM rmu: depends where you measure distance i guess ;)
03:26 PM CaptHindsight: yes
03:27 PM gregcnc: i guess a valid question is why choose one or the other
03:27 PM rmu: that depends on your output filtering
03:27 PM CaptHindsight: depends on the problem and the cats involved
03:27 PM gregcnc: but what if it's dogs?
03:28 PM rmu: in either case you have to switch to paw density modulation
03:28 PM Joe_Hildreth: so what determines the clock rate and what determines the sample rate? So what detrimines the 100kHz and what determines the 1Khz sample rate?
03:28 PM CaptHindsight: now you're into modulation techniques and hows and whys of whats better for the application based
03:29 PM Joe_Hildreth: I don't mean to be dumb. It just comes natural to me.
03:29 PM CaptHindsight: on what the environment is
03:29 PM rmu: in PDM clock and sample rate are more or less the same
03:30 PM CaptHindsight: Joe_Hildreth: there are a few youtubes on it, maybe the graphics will help it sink in
03:30 PM rmu: sample rate limits the frequency you can reproduce (to half sample rate at max)
03:30 PM Joe_Hildreth: In stepconf, you set the clock frequency for PWM, and set it to 0 for PDM. YouTube would be great, but my searches didn't turn up much.
03:32 PM rmu: Joe_Hildreth: i think in this case the clock is the frequency of the base thread
03:34 PM rmu: Joe_Hildreth: for PWM, the PWM rate configures the resolution
03:34 PM Joe_Hildreth: rmu, that helps. Clock is freq of base thread, what would determine the sampling rate frequency then?
03:37 PM rmu: i'm guessing, would need to check the code. In PDM case, sample freq = clock freq. in PWM case, documentation says you configure the PWM rate in Hz, so resolution (number of different voltage levels after filtering) should be clock freq / configured PWM rate
03:39 PM rmu: Joe_Hildreth: look at manpage of pwmgen
03:39 PM rmu: pwmgen(9)
03:39 PM Joe_Hildreth: Thanks for the help folks. I have looked a some webpages on the topic but it confuses me. I think I am getting a better understanding. I will look at pwmgen manpage.
03:42 PM rmu: conclusio: software PWM/PDM is limited by slow max clock (around 20kHz). if you need high-resolution analog voltages with kHz update rate, use some dedicated hardware PDM/PWM or a DAC.
03:45 PM CaptHindsight: Joe_Hildreth: back to the picket fence analogy, picture it as a very long fence and you are driving by it at a constant rate
03:45 PM CaptHindsight: Joe_Hildreth: another analogy that might help is replace the pickets with fire hoses spurting water...
03:46 PM CaptHindsight: you are driving by with your leaky bucket catching the spray
03:46 PM CaptHindsight: the closer the hoses the higher the water will be in your leaky bucket
03:47 PM CaptHindsight: the farther apart the lower the water level in the bucket
03:48 PM Joe_Hildreth: CaptHindsight: So in some given distance (time / sampling frequency) I will have more pickets (value) than other times. The number of pickets represents the encoded value, more pickets, higher value, less pickets smaller value.
03:48 PM CaptHindsight: hoses are the carrier frequency, depth of water in the bucket is the modulation
03:49 PM CaptHindsight: yup, yah got it
03:49 PM Joe_Hildreth: PWM measures the percent of duty cycle of the signal for a constant frequency and PDM measures the weight of values over a sampling of the frequency? Is this correct?
03:51 PM CaptHindsight: https://en.wikipedia.org/wiki/Pulse-width_modulation#/media/File:PWM,_3-level.svg
03:51 PM CaptHindsight: PWM ^^
03:51 PM Joe_Hildreth: So at 100kHz taking a sample every 1 kHz, I would have 100 samples and the total number of 1's would represent a percentage of my signal?
03:52 PM CaptHindsight: for PDM yes
03:52 PM CaptHindsight: have to be careful not to confuse time with frequency domains
03:53 PM rmu: PDM doesn't have a sample rate
03:53 PM CaptHindsight: me have to get to real work now
03:53 PM rmu: in the bucket analogy, the buckets have a leak
03:54 PM rmu: and leak at a rate proportional to water in them
03:55 PM CaptHindsight: yes some tuning would be required, size and laeks of bucket, fire hose flow, speed of ox pulling bucket etc
03:55 PM rmu: PWM: 50 hoses on, 50 off, 50 on, 50 off
03:55 PM rmu: PDM: 1 on, 1 off, 1 on, 1 off, 1 on, 1 off
03:55 PM rmu: in both cases, after 100, you have 50 "on" and 50 "off", but they are distributed differently
03:56 PM Deejay: gn8
03:56 PM rmu: gn8
03:58 PM Joe_Hildreth: rmu, but there is an interval in which they are checked, right. If I have a stream of hoses going by at 10000 per second, to be able to get a change in rate I would compare the first 100 hoses to the next 100 hoses, right?
03:58 PM rmu: i don't understand that question
03:58 PM Joe_Hildreth: In terms of how many are on and off? Otherwise how would I get an amplitude over time?
04:00 PM Joe_Hildreth: Tell ya what. Let me digest what you guys have explained to me, and find some more stuff to read about it on the net, then I will come back when I can formulate a question proper. Thanks for being so patient with me. I do appreciate it.
04:00 PM rmu: suppose your bucket half the water one hose would squirt into it while moving by
04:00 PM rmu: so all hoses on would fill the bucket at a rate of half what a hose outputs
04:00 PM rmu: all hoses off would empty the bucket
04:00 PM rmu: one hose on one off would keep current level
04:01 PM rmu: that is the idea of PDM
04:02 PM rmu: oups
04:02 PM rmu: that should be suppose your bucket leaks...
04:02 PM Joe_Hildreth: OH, so its the change in the stream of hoses that determines an increase or decrease. so if I had hose on, hose on, hose off I would be at 2/3
04:02 PM rmu: yes
04:03 PM gregcnc: what will this video convey?
04:03 PM rmu: but, as i said, it also depends on the output filtering (= size of buckets and leak-rate)
04:03 PM Joe_Hildreth: One last, how are they sampled? am I just comparing a moving window so to speak where I can only compare say 10 or 100 hoses to get a percentage of output?
04:03 PM gregcnc: are PWM and PDM for spindle control all that common? or are you just covering all options?
04:06 PM Joe_Hildreth: In the stepconf video, if you have a spindle it can be controlled via PWM or PDM. The controller I have for my router is PWM controlled, so depending on the length of the duty cycle determines it output speed. There is an option on the dialog to use PDM comtrolled spindles. I just wanted to mention it as an option and give just a brief statement how the two differed.
04:06 PM rmu: Joe_Hildreth: you mean in the PDM case? I suppose the code assumes a simple RC lowpass filter with much lower cutoff freq than clock
04:07 PM Joe_Hildreth: rmu, yes, I meant PDM
04:07 PM rmu: Joe_Hildreth: are you sure it is controlled by PWM and not by analog voltage?
04:07 PM rmu: usually PWM and PDM is a means to generate an analog voltage, i.e. (with proper filter) a type of DAC if you want
04:08 PM gregcnc: I used PWM to drive a RC speed controller, but that isn't common.
04:08 PM rmu: those 1-bit audio-DACs are in fact PDMs
04:08 PM gregcnc: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?VFD_Digital/Analog_Interface
04:08 PM CaptHindsight: might be fun to ask in ##electronics
04:09 PM Joe_Hildreth: rmu, I have to look at the docs for it, I am not sure now. It is http://www.vhipe.com/product-private/SuperPID-home.htm I have not hooked it up yet. Wanted to do a video on it when I did.
04:09 PM rmu: my VFD takes +-10V and translates that to "speed" (frequency) for the induction motor
04:11 PM Joe_Hildreth: rmu, so the PWM and PDM generates the digital version of the analog voltages you need to run the VFD? Where does the DAC take place?
04:11 PM rmu: potentiometer means voltage
04:11 PM gregcnc: depends if you need it
04:11 PM gregcnc: that's what I was getting at. it's not a common situtation
04:11 PM Joe_Hildreth: Are you controlling the spindle speed with LCNC, or external.
04:12 PM CaptHindsight: http://www.tf.llu.lv/conference/proceedings2009/Papers/50_Janis_Donins.pdf
04:12 PM gregcnc: unless you are driving directly from partport?
04:12 PM rmu: Joe_Hildreth: in my case, the mesa card generates (via PDM, filtering and i suppose an opamp) +-10V
04:13 PM rmu: i am controlling spindle speed from linuxcnc
04:14 PM Joe_Hildreth: yes, the intent is to use the parport for PWM or PDM. That is what I am let to believe stepconf is doing.
04:14 PM rmu: but "open loop", no feedback, just setting motor frequency.
04:17 PM rmu: btw, this thing seems expensive. there are industrial grade brand VFDs that are cheaper (about 100)
04:18 PM rmu: (that come in a proper case)
04:19 PM CaptHindsight: " PDM using signals from the parallel port. This doesn’t set the speed accurately at all and the PDM/speed conversion curve is hilariously inaccurate."
04:19 PM rmu: who says that
04:22 PM rmu: i guess i'm going back to my miami vice rewatch project ;-)
04:22 PM Joe_Hildreth: It is designed to be used with a router. Probably too much money, but at this point I have it, soooo..... I have the one for the hitachi 12mvc. I may have to call it stupid tax. Comes with the territory of being a newbie hobbyist
04:27 PM Joe_Hildreth: Thank all for the help. I gotta run.
04:47 PM methods_: https://www.denverpost.com/2019/02/05/how-runner-killed-mountain-lion-attack-larimer-county/
04:47 PM methods_: rawr
04:54 PM CaptHindsight: https://imgur.com/gallery/ZYScT cat slap
04:55 PM methods_: hahaha
05:14 PM MacGalempsy: nice
07:01 PM CaptHindsight: freezing rain here
07:07 PM MacGalempsy: it got cold here, too...
07:43 PM norias: hello
07:48 PM CaptHindsight: howdy
07:53 PM norias: how goes?
07:56 PM infornography: good?
07:57 PM Rab_ is now known as Rab
07:58 PM norias: cool
07:59 PM infornography: how are you?
08:01 PM norias: well, thank you
08:01 PM norias: researching benchtop sized horizontal mills
08:46 PM _unreal_: join #arduino
08:46 PM _unreal_: ?
08:46 PM _unreal_: oh missed the /
08:49 PM _unreal_: So whats new?
08:49 PM infornography: everyone to #arduino!
08:50 PM _unreal_: I had first
08:50 PM _unreal_: infornography, I was totally like "!!!!! th faaaak?" just happend?
09:27 PM skunkworks: finally geared down the B axis of the K&T... it was not very consistant at actually rotating it every time..
09:27 PM skunkworks: 3:1 seems to have fixed it.
09:28 PM skunkworks: https://youtu.be/9e9IyWELn2Y
09:31 PM skunkworks: it was an old floor scrubbing dc motor.. low rpm - high torque. just not quite high enough for our initial gearing
09:34 PM Tom_L: much backlash on that?
09:35 PM Tom_L: or does it lock in place once turned?
09:39 PM MacGalempsy: picked up this 3D printer and in less than 2hrs it is putting down a test print.
09:39 PM MacGalempsy: so far it is looking decent
09:40 PM Tom_L: nice
09:41 PM MacGalempsy: the first layer height was not perfect, but it is running smooth on subsequent layers.
09:48 PM skunkworks: Tom_L: curvix coupling.
09:48 PM skunkworks: 5 deg index
09:48 PM skunkworks: so doesn't need to be perfect
09:48 PM skunkworks: although it does suprisingly well