#linuxcnc Logs
Dec 16 2018
#linuxcnc Calendar
12:00 AM veek: how does the quill in a drill press, move wrt the container for the quill (how does the feed handle mechanism work - how are they able to move a rotating chuck)
12:35 AM PL7icnc: hi got 12inches of snow here
12:35 AM PL7icnc: Need For Shuffle
12:38 AM infornography: wut
01:02 AM XXCoder: veek: nice video
01:20 AM XXCoder: LOL https://www.youtube.com/watch?v=zVkcJOgouR8
01:46 AM veek: XXCoder, did you check out his lubricity tester :) for lubricants.. he's taken a bearing element out of it's housing and mounted it in a non-rotating direction to a rotating bearing race (because bearings are manufactured to a high tolerance so consistent results) then he rotates the race using a motor+pulley and dumps lubricant on - to see how the bearing element erodes :)
01:46 AM XXCoder: nope
01:46 AM veek: https://www.youtube.com/watch?v=N0gP4aEad-w
01:48 AM XXCoder: watching
01:56 AM veek: XXCoder, check out this as well, it's machining art https://www.youtube.com/watch?v=1mZhOlr5v-s
01:56 AM veek: effing brilliant!
01:56 AM XXCoder: will do once video im watching is done
01:57 AM veek: they should screen that at cannes or whatever
02:00 AM veek: that part where he splits the block of steel with a couple of dowels is especially awesome
02:01 AM XXCoder: lol yeah hes in my sub list
02:01 AM XXCoder: watched before
02:01 AM XXCoder: i learned trick of using wire for vise unevenness when making true squares
02:05 AM XXCoder: so far my favorite is feeding cat steel and getting nuts and bolts as poop
02:06 AM veek: hoo link? man :( I did not know about that blue stuff he used :( 'marking blue'
02:06 AM XXCoder: oh lol its done in that video
02:06 AM XXCoder: its called blue
02:06 AM XXCoder: yeah
02:06 AM XXCoder: machinist blue
02:07 AM XXCoder: dykeem machinist blue is most common brand
02:07 AM XXCoder: one e'
02:08 AM veek: we can mix our own :) prepared by mixing Prussian blue with a non-drying oily material (for example, grease)
02:08 AM XXCoder: clickgear he felt that orginially it was candle soot, from burning candle into part
02:08 AM XXCoder: (hovering part right above fire)
02:09 AM XXCoder: he used it that way and it was very workable
02:09 AM Wolf__: I like blue sharpie
02:10 AM XXCoder: I just use perment marker for some uses
02:10 AM veek: 'It's the same for large boulders. He didn't show how to score the breakage line, so the secret's still safe. TOT, that was close... maybe too close.'
02:11 AM Wolf__: hmm 1204 ball screws or T8-8 lead screws for my plasma machine…
02:14 AM Wolf__: I got lazy (no spare time) so I got a open build sphinx plate set https://imgur.com/2A5tZvj
02:15 AM XXCoder: veek: that video I love the endimng
02:15 AM XXCoder: wowrather large one
02:16 AM Wolf__: 1m x 1.5m
02:16 AM XXCoder: is it plasma?
02:16 AM Wolf__: thats the plan, I need to order some mesa for it
02:16 AM XXCoder: nice
02:17 AM Wolf__: trying to make up my mind for the x/y drive tho, acme, ball screw or belt
02:18 AM XXCoder: dont belt have bit issues with speed if theres enough mass
02:18 AM Wolf__: I think all 3 have issue with speed lol
02:18 AM XXCoder: besides that I dunno, it suffers zero sideload so as long as it reliably moves it doesnt matter?
02:19 AM Wolf__: yeah no real slide load other then the torch lead
02:19 AM XXCoder: yeah only sideload is changing directions at speed
02:20 AM Wolf__: most of my cuts are going to be 3/16”+ so its not going to be rocking any thing quickly
02:21 AM Wolf__: I’m leaning towards 8mm x 8mm 4 start acme just because its simple, plate set was made to use it
02:23 AM XXCoder: more starts the faster right?
02:24 AM Wolf__: yeah, 8mm per rotation
02:26 AM Wolf__: I could go 12mm ball screw with 4mm pitch but I may have to mess with the plates to make that work
02:36 AM Deejay: moin
02:42 AM veek: in a drill press arbor, which is the major dia and the minor dia https://images-na.ssl-images-amazon.com/images/I/512aGuGr8NL._SX425_.jpg (there are two truncated cones)
02:42 AM veek: isn't there a book that explains all this stuff :(
02:52 AM Wolf__: ugh, guess T8 x8mm acme it is for this build, I need working soon > super accurate anyways lol
02:53 AM XXCoder: dont think it'll make much difference anyway
02:53 AM XXCoder: maybe get backlash nut then done
02:53 AM Wolf__: going to use the open builds backlash nut with it
02:54 AM Wolf__: should be fun to see how fast the thing wears with use lol
02:54 AM XXCoder: yeah
02:55 AM Wolf__: but I only need weld fitment and rubber grommet accuracy =D
02:57 AM XXCoder: yeah you have huge flexability on this due to low precision needs
02:57 AM gloops: i had a t8 screw on z was fine, ill use them for my lathe short axis
02:58 AM Wolf__: https://imgur.com/2A5tZvj =)
02:58 AM gloops: they also do a t10 of those cheapo chinese screws on ebay
02:58 AM Wolf__: just ordered 2x 2000mm T8x8 for that thing
02:59 AM gloops: well, the issue with 2m is whip at that diameter
02:59 AM Wolf__: rapids aren’t on that thing lol
03:00 AM Wolf__: already know thats a issue
03:00 AM gloops: should be ok then, i got some extra nuts for pennies for mine, if you can get some very thin shim even paper i guess, bolt the nuts together with shim, no backlash
03:01 AM Wolf__: https://openbuildspartstore.com/anti-backlash-nut-block-for-8mm-metric-acme-lead-screw/
03:01 AM gloops: just need something to spring the 2 apart
03:01 AM Wolf__: time crunch build sorta here, need it up and making parts soon
03:01 AM gloops: not used the anti-backlash nuts
03:03 AM gloops: there isnt much backlash in them anyway, although i suppose it would grow with a lot of use
03:05 AM Wolfmetalfab is now known as Wolf__
03:06 AM Wolf__: also its not 2m axis, the long side of the machine is only 1500mm
03:08 AM gloops: https://www.ebay.co.uk/itm/8MM-Anti-Backlash-Spring-Nut-for-T8-Threaded-Acme-Lead-Screw-for-3D-Printer/392162426758?
03:08 AM gloops: these are only £2 on the mainland now anyway
03:09 AM Wolf__: yeah, the screws I ordered have those included
03:10 AM Wolf__: but this is the view in my shop right now https://i.imgur.com/Gse5frx.jpg and I have 3 more trucks waiting outside
03:10 AM gloops: youre looking at about 350 rpm according to the calculator, 8mm pitch = 2800mm/min
03:10 AM Wolf__: dont have the time to machine anything lol
03:14 AM gloops: lol, well better to have no time than only time i guess
03:14 AM Wolf__: somewhat
03:14 AM gloops: ive had several goes at launching my router into a profitable status, too busy atm
03:14 AM Wolf__: need some time to get shop improvements done
03:14 AM gloops: cant really leave other work that pays much more to play with a router, i just keep putting a little bit more in place to be ready with it
03:14 AM gloops: then when the iron is hot...!!
03:14 AM Wolf__: my problem is for example today i got in the shop at 10am, got home at 12am
03:15 AM gloops: you could do with training a lad up, or some old bloke looking for something to pass the time
03:17 AM Wolf__: wish is was that simple, I’m dong everything from simple fab work to custom bent hydraulic hard lines and electrical system integration on these trucks
03:19 AM gloops: surprising though, it can be a big relief if you can just leave someone plodding on with one thing while you work on something else - its getting them to the point where they can be left with something
03:19 AM Wolf__: compound angle bending makes my head hurt https://imgur.com/l6fdYwn
03:21 AM gloops: my mate posted a vid of a new machine hes got, cuts pipe ends for welding, pretty neat thing
03:21 AM Wolf__: those things are cool
03:21 AM Wolf__: pipe welding on the other hand, not so much fun lol
03:23 AM gloops: https://www.facebook.com/martin.keenan.58/videos/2259571904055339/
03:23 AM gloops: dunno if youd have to be a friend to watch
03:24 AM XXCoder: its global
03:24 AM gloops: the welding is easy when that bit is done lol
03:25 AM Wolf__: ooo that’s not what I was expecting, plasma tube notcher, nice
03:26 AM gloops: he makes chassis for kit cars
03:27 AM XXCoder: it does look nice yeah
03:27 AM XXCoder: makes making framing much easier
03:28 AM Wolf__: when I hear pipe cutting http://hmpipe.com/machines/standard-beveling-machine/ is what comes to mind
03:30 AM gloops: saves all the hassle with an angle grinder
03:31 AM XXCoder: probably need to grind surfaces though
03:39 AM gloops: well anything that cuts prep time down is a bonus, i suppose if you were doing a lot of work it wouldnt need a skilled operator for those things
03:40 AM XXCoder: indeed
03:40 AM XXCoder: https://www.youtube.com/watch?v=YYd5tooqNGQ new fordboy casting
03:42 AM gloops: something id like to get into lol
03:42 AM gloops: scrap aluminium everywhere round here
03:42 AM XXCoder: stream assisted interesting
03:43 AM XXCoder: nice
03:43 AM XXCoder: I want to try casting but only comparateky low temperate alloys
03:44 AM gloops: i saw one of those blacksmiths kiln things, i bet they would work for melting alloys
03:45 AM gloops: they get a horseshoe glowing yellow, no fires or smoke or anything
03:45 AM XXCoder: yeah. plan to play with wood casts
03:45 AM XXCoder: since temperate is low enough
03:46 AM gloops: in fact, an electric cooker ring
03:47 AM XXCoder: im considering 75c to 100c
03:47 AM gloops: (probably burn the element though if insulated)
03:47 AM XXCoder: which can be easily melted by say 3d printer hotend lol
03:48 AM gloops: ive not seen those kind of alloys, my main interest was aluminium - as available free lol
03:48 AM XXCoder: i want to try alum too but neighborhood dont really permit that
03:48 AM XXCoder: maybe when has shop
03:49 AM gloops: im ok occassionally, think something would be said if it was regular lol
04:06 AM veek: man ball screw design is quite clever.. who'd have thought of sticking balls under a nut to reduce friction - it's like a mini bearing for the threaded-contact portion
04:07 AM veek: but on the other hand once you create bearings :) it seems so obvious heh
04:08 AM XXCoder: i guess so yeah
04:08 AM XXCoder: we have supoer precision bearing balls now so yeah
04:08 AM XXCoder: you ever seen that video
04:08 AM veek: yeah :) https://www.youtube.com/watch?v=K3i-Ecb698g this one ?
04:08 AM XXCoder: no
04:09 AM XXCoder: https://www.youtube.com/watch?v=41Z5v4NybWA i think
04:09 AM veek: heck we need an awesome videos bot :)
04:10 AM veek: it'll tell us if there are duplicates and we can categorize emm
04:11 AM XXCoder: more details on balls themselves https://www.youtube.com/watch?v=19duYMdiXi0
04:13 AM veek: f! all my childhood Q's answered one-by-one - man-o-man
04:13 AM XXCoder: heh yeah
04:24 AM XXCoder: veek: bearings is really cheap at aliexpress lol
04:24 AM XXCoder: 2 mm 50 peices not even a dollar
04:24 AM XXCoder: though I'd build a size sorter at home to sort em
04:28 AM XXCoder: with bearings that cheap can buy so much for evil pranks.
04:28 AM XXCoder: 10mm ones, under 5 usd for 50 of em
04:47 AM jthornton: morning
04:48 AM XXCoder: hey jt
04:53 AM XXCoder: jt I was bored and after talking about bearings, I looked up bearings at aliexpress
04:53 AM XXCoder: prices is nuts, though I bet yuou tols are bit ranged also
04:54 AM jthornton: what kind of bearings?
04:54 AM XXCoder: just bearing balls.
04:54 AM XXCoder: sorry doidnt specify balls lol
05:06 AM jthornton: lol I'm watching 6 videos at once using the skew chisel
05:06 AM jthornton: only 2 are cc
05:07 AM veek: XXCoder, but how do they create the rings for the bearings?? like how do they join them up? that's not shown
05:08 AM XXCoder: first video does
05:08 AM veek: nope .. starts off with fully formed rings
05:08 AM XXCoder: it does show em being made on automated lathe
05:08 AM XXCoder: then finished
05:13 AM XXCoder: man
05:13 AM XXCoder: hes insane https://www.youtube.com/watch?v=t557dPspLxo
05:13 AM XXCoder: dont worry he gets to main event evenually. he always do weird start of video.,
05:25 AM veek: yeah that's a frigging awesome video - wish i knew what he was actually doing .. as in he's taking a casting/mold - there's a subreddit for that vacuum forming and then he literally makes a knife blade out of milk
05:25 AM veek: and tests it's hardness and stuff
05:26 AM XXCoder: yeah
05:26 AM XXCoder: he uses silicne to make mold
05:26 AM XXCoder: then he uses epoxy for initial part
05:26 AM XXCoder: then he uses uv cure unknown as coating
05:26 AM veek: bet it'd be useful for us.. in die making
05:27 AM XXCoder: the cow head handle is awesome and maybe awkward a little
05:27 AM XXCoder: did you see cut demo end? wow
05:27 AM veek: yeah
05:27 AM veek: totally awesome
05:27 AM XXCoder: its sharper than regular metal knives here
05:28 AM XXCoder: I'd say he could make paper knife sharp enough to really easily cut paper, except he already did that
05:39 AM veek: crud i gtg dig in the garden bbl
05:49 AM jthornton: dang I got banged up scrambling in the dark to get to the egg Veronica laid during the night before anyone busted it
06:54 AM veek: ow my back's fscked up.. i forgot to bend at the knees
07:11 AM uniqdom: Hello, I'm testing a MPCNC that has a Mini-Rambo board. Steppers are moving, but after the movement I can hear a high pitch. Also, motor drivers IC in the board are getting hot. This is a problem, right?
07:11 AM Loetmichel: uniqdom: depends on HOW hot
07:12 AM Loetmichel: and usually the steppers emit "white noise" not a high pitch whine
07:12 AM Loetmichel: sounds a bit like a gas leak
07:13 AM uniqdom: this is a high pitch, like the one you hear in TV
07:14 AM jthornton: anyone remember where the debian 9 iso is located at?
07:15 AM veek: jthornton, https://www.debian.org/CD/http-ftp/
07:16 AM jthornton: no, I meant the one with uspace and linuxcnc on it
07:16 AM jthornton: we have one somewhere IIRC
07:25 AM jthornton: https://www.youtube.com/watch?v=Hy2zg9K4iWw
07:25 AM jthornton: wow this guy is using a spring pole lathe I think
07:26 AM jthornton: hmm maybe a treadle lathe
07:42 AM Tom_itx: jthornton, http://www.linuxcnc.org/testing-stretch-rtpreempt/
07:42 AM Tom_itx: that?
07:43 AM jthornton: yes, thanks
08:24 AM sensille: Loetmichel: how to you do z-touchoff, and do you use the tool probe that comes with the machine?
08:57 AM veek: what's the thread in this linear actuator - how is he able to move the thread forward that way? https://en.wikipedia.org/wiki/Linear_actuator
08:57 AM veek: is the rotor moving forward as well inside the stator
08:59 AM veek: Ooo nm linear motor (but in the case of that green motor?)
09:01 AM veek: I don't get how the distance of the thread reduces from the tip.. that's weird
09:02 AM veek: usually - the shaft rotates the thread and the yellow object/nut is forced forward (if it's held preventing rotation)
09:45 AM PL7icnc: hi
09:46 AM PL7icnc: Is Andy from the Forum Somhere around
09:47 AM PL7icnc: Someone in Europ or Even Germany
09:48 AM PL7icnc: is there a Channel Log somwhere
09:49 AM PL7icnc: so i can Reread answers
09:49 AM PL7icnc: Forum is Quite good
09:57 AM PL7icnc: Can i see in the Forum How is online
09:57 AM PL7icnc: No direct messaging i guess is posible
09:58 AM PL7icnc: Someone here that did Know the OLD german Guy that Build all this Education mashines
09:59 AM PL7icnc: im off
09:59 AM PL7icnc: seams only weekdays and US Timesone Responds Here
10:07 AM uniqdom: My printer is partly working. I'm using a pen as a tool to do some drawings and do some calibrations. it draws, but it draws like a child.
10:07 AM uniqdom: I mean, my cnc
10:21 AM Loetmichel: sensille: i touch the workpiece with running spindle until i see a mark, then back up z 0.02 to 0.05
10:24 AM HighInBC: uniqdom: probably because a child holds a pen in a fist and does not alter the angle as they write
10:24 AM HighInBC: like a CNC
10:24 AM HighInBC: the fancy signature machines have pens that change pressure and angle
10:25 AM uniqdom: comparison here: https://imgur.com/a/0iONYbU
10:25 AM uniqdom: there are two images there
10:26 AM gregcnc: backlash? lost steps?
10:29 AM uniqdom: gregcnc, sorry I'm new in CNC's world, and my english is limited. I can't understand what backlash means.
10:29 AM uniqdom: I don't know if there are lost steps. I don't here any strange in steppers. I only hear a high pitch when the movement ends.
10:30 AM gregcnc: the figures are closed so probably no lost steps
10:30 AM uniqdom: ok
10:31 AM gregcnc: http://www.machinetoolhelp.com/Repairing/What_is_backlash.html
10:31 AM uniqdom: backlash is related to lost steps?
10:31 AM uniqdom: thanks :)
10:32 AM gregcnc: poorly designed/built machines can be problematic
10:35 AM gregcnc: if this is a purchased machine /kit, search for what others have done to improve it
10:42 AM uniqdom: it's a MPCNC, I will take a look
10:54 AM fragalot: hey
11:15 AM uniqdom: hello
11:20 AM uniqdom: If I have the same setup for X axis and Y axis (same stepper motors), steps per millimeter should be the same in both axis, right?
11:20 AM fragalot: same stepper motors, same stepper driver settings (most can do microstepping), and the same leadscrews or belt setups, yes
11:21 AM uniqdom: The only thing that differs from both axis is the lenght.
11:22 AM fragalot: that's fine, the length is a different setting
11:23 AM uniqdom: 105 steps per mm for X axis and 121 per mm for Y. That's the setting that I have in mini-rambo board
11:23 AM uniqdom: so, they should be equally
11:24 AM fragalot: if they have the same leadscrews, yes
11:28 AM uniqdom: I only have a leadscrew for Z axis, if I understand correctly what a leadscrew is. for the other axis i'm using a conduit
11:28 AM fragalot: that's fine, what i'm trying to say is that if they're the same, your steps/mm setting will also be the same
11:29 AM fragalot: what linuxcnc wants to know is how many "pulses" to send to the motor controller to have it move 1 mm
11:30 AM fragalot: and that number depends on the motor controller settings (microstepping), the motor(steps / revolution), any mechanical gearing (pulley ratio, if applicable) and the 'pitch' of the axis (mm / revolution)
11:32 AM uniqdom: Oh. I have set those parameters in Marlin firmware. there should other pair of settings for steps per mm in LinuxCNC?
11:33 AM uniqdom: I'm still not using linuxcnc. it's still downloading, I don't have a fast internet connection here. I'm using repetier. In mini-rambo I'm using Marlin.
11:35 AM fragalot: I don't think linuxCNC does what you think it does if you are using Marlin and repetier
11:36 AM uniqdom: If I understand it well, I can change repetier by linuxcnc, right?
11:37 AM fragalot: you can, but you'll have to throw the board that currently runs Marlin out the window
11:37 AM fragalot: and replace it with a linuxcnc compatible breakout-board, which you'll then wire into the stepper drivers
11:37 AM uniqdom: lol.. I see
12:14 PM gloops: anywhere near the yellow vest rioting fragalot?
12:19 PM sensille: Loetmichel: and same procedure for tool changes within a program?
12:20 PM fragalot: gloops: nah
12:21 PM fragalot: just came back from the UK
02:07 PM syyl: fragalot!
02:07 PM syyl: i ship tomorrow morning
02:08 PM syyl: at the dawn of light, walking trough the snow to the post office, fighting wolves.
02:08 PM fragalot: syyl: Sweet :-)
02:48 PM miss0r2: fragalot
02:48 PM miss0r2: Where you been ? :)
02:48 PM miss0r2: fragalot: I got license plates on the landrover
02:49 PM fragalot: miss0r2: been working. (read: visited the inlaws)
02:50 PM miss0r2: Sounds tough :]
02:50 PM miss0r2: I'm not sure theres a surefire way to flush all that tea from your system
02:50 PM fragalot: it was followed by a solid 11hrs of sleep when I got back, so yeah xD
02:50 PM fragalot: the tea flushes itself through my system almost instantly
02:51 PM miss0r2: lol
02:51 PM fragalot: all 3 gallons per day
02:51 PM miss0r2: aehm... /hour...
02:52 PM gloops: fragalot has been on an engineering pilgrimage to Britain
02:52 PM fragalot: pretty sure that if I had over 13 liters of tea per hour that'd kill a man
02:52 PM fragalot: gloops: social engineering, yes. :-)
02:52 PM gloops: he seeks the deep knowledge of the great makers
02:52 PM miss0r2: sure.. but not a british man :P
02:53 PM gloops: fragalot ahh youve been to London
02:53 PM * miss0r2 needs to get some tea brewing skills..
02:53 PM fragalot: gloops: skipped london
02:53 PM miss0r2: One can hardly work on a land rover purely on coffee
02:53 PM fragalot: miss0r2: you can if you dilute it with petrol
02:54 PM miss0r2: Indeed.. I had a leaky petrol pump.. so I had to suck the hose to prime it once or twice.. so that is basically a given
02:54 PM fragalot: :D
02:54 PM gloops: forensics would probably uncover a lot of ancient tea stains on that landrover lol
02:54 PM miss0r2: gloops: well.. the old chassis would tell a story of its own - with all the old grit from off roading lodged in there
02:55 PM gloops: swill it out with old sump oil
02:55 PM miss0r2: Glad that thing is gone. The only bit of the old frame remaining is a 6x4cm piece in my keychin
02:56 PM miss0r2: it was close to original thickness, as it was close to the outside splash lubrication on the gearbox
02:56 PM gloops: the chassis reacted with the ally anyway over time
02:56 PM fragalot: is that thickness INCLUDING the rust buildup?
02:57 PM miss0r2: fragalot. Absolutly. How else would you even get close to original dimensions? :P
02:57 PM fragalot: paint
02:57 PM miss0r2: hehe and lots of it
02:57 PM fragalot: :D
02:57 PM gloops: several coats of thick fergusson enamel on a cold morning once a year kept the rust out of sight
02:58 PM miss0r2: I need to get some shuteye. The misses can go into labour any day now.. so I need to stay rested.
02:58 PM fragalot: enjoy it while you can
02:58 PM gloops: oh yeah, the joys...
02:58 PM * miss0r2 remembers that part quite vividly.. thanks
03:01 PM miss0r2: See you around.
03:01 PM gloops: be strong
03:56 PM Deejay: gn8
06:54 PM veek: https://en.wikipedia.org/wiki/Buttress_thread what does he mean by 'perpendicular face, operating in a split nut, generates minimal disengagement force when tightened in the normally loaded direction' ?
06:55 PM XXCoder: reading
06:55 PM veek: because the nut face is parallel to the thread face?
06:55 PM XXCoder: see picture?
06:55 PM XXCoder: small one
06:56 PM XXCoder: thread faces is T to force, so force doesnt deform or make it extra tight
06:56 PM XXCoder: so you can always easily re-loosen even with huge torque pushing it towards tightening
06:58 PM veek: ah hmm thanks
06:58 PM XXCoder: no problem. theres small chance i could be wrong but yeah
07:19 PM cnomad is now known as secondfart
07:20 PM secondfart is now known as securityfart
07:25 PM securityfart is now known as cnomad
08:27 PM jbar: In a subroutine..............
08:28 PM jbar: One line: G53 G0 z1
08:28 PM jbar: Next Line: G0 X0 Y0
08:29 PM jbar: In the next line it goex to the G54 X0 Y0. Why does it do this when the previous line was G53, and no G54 was declared in the Next line ??
08:47 PM skunkworks: G53 isn't modal.. You have to have it on every line you want to use it
08:48 PM XXCoder: yeah
08:48 PM XXCoder: hey all
08:52 PM jbar: OK, thanks.