#linuxcnc Logs

Aug 29 2022

#linuxcnc Calendar

01:05 AM Deejay: moin
01:37 AM silopolis[m]: <Tom_L> "yes but you have to have the img..." <- You say you can make a bootable sd right? So you can dump it to an image file with dd, right?
01:37 AM silopolis[m]: Maybe something I don't get here 🤔
02:01 AM randy: morning
04:45 AM Tom_L: morning
04:57 AM mrec: can anyone recommend a tool for cutting off 30cm sheet metal?
04:57 AM mrec: a small tool
04:58 AM rmu: angle grinder
04:58 AM Loetmichel_: mrec: metal shears?
04:59 AM mrec: I need a good straight edge
04:59 AM mrec: https://ttmc.en.alibaba.com/product/237888802-220956442/3_IN_1_305_TTMC_12_Shear_Press_Brake_and_Slip_Roll_Machine_Sheet_Metal_Fabrication_Machines.html?spm=a2700.wholesale.0.0.1d6f1a81rfPZn6
04:59 AM mrec: does anyone have experience with that one?
04:59 AM mrec: 305mm shearing width ...
04:59 AM Loetmichel_: depending on what metal: a straight edge, a sharp knife or chisel, some scoring and just break it off. (in a pinch)
04:59 AM mrec: soft steel
05:00 AM mrec: I want to make some spur gears 0.8mm thick, before I milled circles that worked but it takes too long for my taste
05:00 AM mrec: so I'd just drill the sheets and put it into the lathe to make them round
05:14 AM rmu: https://en.wikipedia.org/wiki/Nibbler
05:14 AM rmu: there are also powered variants
05:20 AM JT-Cave: morning
05:22 AM mrec: rmu: this is interesting
05:22 AM mrec: I never heard about that before
05:25 AM rmu: german wikipedia linked this article https://www.ausbaupraxis.de/arbeiten-mit-dem-nibbler-ein-echter-knabberspass-17112021
05:53 AM mrec: the company which sells steel nearby has a shearing machine, however they're not sure if they can handle the thin metal sheet we'll see tomorrow
05:54 AM mrec: I will probably get a nibbler after that
06:07 AM rmu: 0,8mm steel is a bit too much for manual snips, but angle grinder with cutoff discs should work nicely
06:10 AM mrec: I used a single flute endmill to pre-cut the discs from the raw material it was okay so far. but of course it takes too long
06:11 AM mrec: on the lathe I can make it round within a few seconds if I have a square
06:12 AM mrec: best would be laser cutting of course but I don't have that available plus if I order it it will take maybe 2 weeks
06:14 AM rmu: mrec: plasma could work also but is a bit messy
06:33 AM mrec: rmu: did you do some more work with sheet metal in the past?
06:34 AM mrec: currently I'm using regular drills for getting holes into it... I just learned that using brad point drills (also known as the regular wood drills in Germany) seem to work well with it.
06:35 AM mrec: however I wouldn't go into the material with a regular wood drill... so I'm looking for HSS
06:38 AM -!- #linuxcnc mode set to +v by ChanServ
06:38 AM -!- #linuxcnc mode set to +v by ChanServ
06:43 AM mrec: this 0.8mm sheet metal looks so weak unfortunately my teeth aren't good enough to bite the slices off
06:44 AM -!- #linuxcnc mode set to +v by ChanServ
07:18 AM -!- #linuxcnc mode set to +v by ChanServ
07:19 AM -!- #linuxcnc mode set to +v by ChanServ
07:27 AM ZincBoy[CAON][m]: One hint for holes in sheet metal is to use step drills in an impact driver. The holes stay nice and round and using an impact driver means no grabbing of the workpiece.
07:30 AM mrec: I'll try to slice them with CNC again because that's just what I have here... for now
07:30 AM mrec: just clamp it on the table and run through the nut holes with an endmill
07:46 AM rmu: mrec: i do work with sheet metal. 0.8mm seems very thin for spur gears.
07:55 AM mrec: it is yes
08:27 AM mrec: riding through the t-slots seems to work fine
08:27 AM mrec: I directly clamped the sheet to the table
08:28 AM mrec: I'm getting nice slices out of it
09:37 AM skunkwor1s: https://photos.app.goo.gl/N8mz44FBNuycRe9C7
09:37 AM skunkwor1s: replaced..
09:37 AM skunkwor1s: https://photos.app.goo.gl/sM1ZwjCoBkMPAjFy9
09:39 AM skunkwor1s is now known as skunkworks
12:22 PM -!- #linuxcnc mode set to +v by ChanServ
02:12 PM perry_j1987: how goes it
02:15 PM jdh: it would go better if you bought my g0704
02:15 PM perry_j1987: lol
02:15 PM perry_j1987: someone's trying to sell me a lms high torque mini mill right now too
02:26 PM jdh: buy them both!
02:27 PM jdh: that's a better X2?
02:30 PM roycroft: i could be interested in a g0704 at some point, but certainly not now
02:31 PM roycroft: although the pm25-mv essentially the same machine, without the stand that i would not need, and with a better fit and finish from the factory
02:45 PM perry_j1987: gah spotty internet
02:51 PM roguish[m]: roycroft: if you purchase a PM unit, make sure it's one made in Tiawan, not China...... my PM-940 is Chinese and it's manuf is horrible.....
03:02 PM perry_j1987: that 728vt looks sure nice
03:11 PM JT-MachineShop: so for 5k you get a desktop CNC ready mill
03:18 PM -!- #linuxcnc mode set to +v by ChanServ
03:20 PM perry_j1987: there's that cnc baron for around that price
03:20 PM perry_j1987: all cnc'd up
03:23 PM roycroft: the cnc baron is a smaller machine and costs a lot more
03:24 PM roycroft: the pm940v would ba good for a cnc conversion
03:27 PM perry_j1987: depending on whta you want /need those emco concept 55 mills are around 5-6k
03:27 PM perry_j1987: fully enclosed 8 tool atc power drawbar etc
03:28 PM perry_j1987: i've been down this rabbit hole so many times
03:28 PM perry_j1987: its always 1k more and you get this and that heh
03:28 PM perry_j1987: till you start looking at used VF2 machines heh
03:40 PM CaptHindsight[m]: https://www.cncmasters.com/baron-milling-machine/ it at least has a square post
03:40 PM CaptHindsight[m]: New CNC Baron Mill for $6,350
03:41 PM perry_j1987: talked to drpros they refuse to import weiss mills they have listed on their site cause of trumps tarrifs they said lol
03:41 PM CaptHindsight[m]: I see used Matsuuras for far less all the time
03:45 PM perry_j1987: my main reason for looking at these smaller ones is power constraints and space
03:46 PM perry_j1987: i am not planning on being in this shop long
03:46 PM Tom_L: you just want a smaller paper weight
03:48 PM perry_j1987: yup lol
03:48 PM perry_j1987: well i figure i could always use it for 2nd op stuff or someting n the future
03:48 PM CaptHindsight[m]: tons of used small mills and parts for cheap still on ebay
03:48 PM perry_j1987: those emco concept 55 mills look real nice
03:50 PM perry_j1987: smaller work envelope but everything is there
03:50 PM perry_j1987: fully functioning just smaller
03:50 PM perry_j1987: i could throw a 4th with rotary pallet on there and have a ton of space equivalent
03:55 PM CaptHindsight[m]: look at the small mill Tom built for hardly anything
03:56 PM CaptHindsight[m]: invested in a good welder first
03:56 PM perry_j1987: im starting to get burnt out on constantly tinkering i want to just start making parts for a while
04:07 PM perry_j1987: kinda want to order a coaxial indicator
04:07 PM perry_j1987: would make this lathe a lot less tedious
04:16 PM -!- #linuxcnc mode set to +v by ChanServ
04:17 PM * JT-Shop thought it might be easy for a while but got two jobs today
04:18 PM perry_j1987: what are they
04:19 PM Tom_L: JT-Shop, you know much about building packages?
04:21 PM CaptainHindsight: https://polyspectra.com/ what are you supposed to do with $1k per Liter resin?
04:22 PM perry_j1987: charge it to the company cc of course CaptHindsight[m]
04:23 PM Tom_L: does that really matter if you _are_ the company?
04:27 PM JT-Shop: convert a Bacci copy lathe to PLC and convert a double chucker (makes straight handles) from pneumatic to PLC
04:27 PM Tom_L: still doin the copy lathes?
04:28 PM JT-Shop: 1 left, I think he got the parts in to make it run
04:28 PM JT-Shop: gotta do the double chucker first
04:28 PM Tom_L: i pm'd about the rpi thing
04:28 PM JT-Shop: so are you adding the raspi package to a stock debian then doing a live build?
04:28 PM JT-Shop: I read it
04:28 PM perry_j1987: double chucker is that one of those center headstocks with a chucker on both ends?
04:29 PM Tom_L: well i'm trying to figure out where to put it
04:29 PM Tom_L: pere was talking to a guy that is a raspi firmware maintainer about it
04:29 PM JT-Shop: double chucker holds the shaft and shapes both ends and drill a hole in the tool end if needed
04:30 PM JT-Shop: didn't Andy have a branch where he built an iso for the rpi?
04:30 PM perry_j1987: what kind of items are typically made on those
04:31 PM Tom_L: i'm not sure how he did it but i think this may be part of his work
04:31 PM Tom_L: i think he added bookworm to it
04:31 PM JT-Shop: the copy lathe makes 4 handles at a time usually 24" to 48" long like axe, sledge hammer etc
04:32 PM JT-Shop: well one thunder and internet is failing
04:32 PM * JT-Shop better go and spoil the hens before it rains
04:32 PM perry_j1987: ok
04:32 PM JT-Shop: https://gnipsel.com/images/customers/Foxy/
04:33 PM JT-Shop: a couple of other machines I did for Foxy
04:35 PM perry_j1987: thats pretty cool
04:46 PM roycroft: i was just at the store picking up some oil for my van
04:46 PM roycroft: i saw they have a new product - pre-mixed fuel for 2 stroke engines
04:46 PM roycroft: i looked at the label, and what is is is gasoline pre-mixed with 2 stroke oil
04:47 PM roycroft: they are selling it for $38/gallon
04:48 PM roycroft: i'm really thinking that just about everyone is capable of buying a little $3 bottle of 2 stroke oil, dumping it in a 1 gallon gas can, and handing it to a filling station attendent for topping off with what is now cheaper (<$5/gallon) gasoline
04:49 PM roycroft: perhaps i'm wrong though
04:53 PM JT-Shop: perry_j1987, https://gnipsel.com/images/customers/Foxy/Bacci/
04:54 PM JT-Shop: I saw premix at menards the other day but didn't look at the price
04:56 PM roycroft: even if it was cheap, like $8/gallon, there's the problem of the big gallon jug that would not be refillable
04:56 PM roycroft: a gas can can be refilled indefinitely - i have gas cans that are decades old and are still fine
04:57 PM JT-Shop: Oh no your using outlaw gas cans!
04:57 PM JT-Shop: LOL
04:57 PM JT-Shop: 7i96S support has made it to Debian 13
04:58 PM Tom_L: but has it made it to 2.8.4?
04:58 PM JT-Shop: 2.8.4 has not been released yet
05:00 PM Tom_L: is linuxcnc in the debian 13 repo now?
05:00 PM JT-Shop: 12 and 13
05:00 PM Tom_L: good
05:00 PM JT-Shop: as well as mesaflash
05:00 PM Tom_L: right
05:02 PM JT-Shop: I don't think anyone that knows how has pushed the latest mesaflash to debian it's still 3.4.2
05:07 PM Tom_L: well.. don't look at me :)
05:08 PM Tom_L: if i remember on that there was some package they were questioning on it. i don't know what though
05:25 PM perry_j1987: hmm
05:45 PM perry_j1987: spindle at speed on the new lathe is wanting to fight me
05:45 PM perry_j1987: apparently its not near enough
05:46 PM JT-Shop: whip it
05:47 PM -!- #linuxcnc mode set to +v by ChanServ
05:48 PM JT-Shop: this cracked me up last week when I went to look at a sullair compressor, boss said we need an expert to look at this... me why did you call me? him you're the closest thing to an expert we got
05:49 PM Tom_itx: regular or screw compressor?
05:49 PM JT-Shop: screw
05:49 PM Tom_itx: in a room by itself?
05:49 PM Tom_itx: they're kinda noisy
05:50 PM JT-Shop: under a roof outside
05:50 PM Tom_itx is now known as Tom_L
06:00 PM JT-Shop: this one is much quieter than the 50's piston compressor that it replaced
06:00 PM Tom_L: yeah some of those were just as bad
06:00 PM JT-Shop: can't hear the compressor inside because it's too noisy
06:00 PM Tom_L: i'd rather hear a thump thump than a whine though
06:00 PM JT-Shop: with all 4 copy lathes going that's 16 rotary cutters gnawing on wood... not too quiet
06:00 PM JT-Shop: and that don't count all the support ops
06:00 PM Tom_L: no that wouldn't be either
06:00 PM JT-Shop: I don't charge them much for my work as they are a family business
06:01 PM perry_j1987: far as i know the encoder on the spindle was 4000 for scale and its 2000 max rpm
06:02 PM perry_j1987: so i see that in spindle_0 in the .ini
06:02 PM Tom_L: i set mine to within 80% of commanded
06:03 PM Tom_L: the near component
06:06 PM perry_j1987: this is odd
06:07 PM * JT-Shop calls it a day and goes inside before the rain gets here
06:08 PM perry_j1987: have good evening JT-Shop
06:09 PM -!- #linuxcnc mode set to +v by ChanServ
06:12 PM perry_j1987: so pwmgen scale is your machine's max spindle speed
06:12 PM perry_j1987: so i set that to 2000
06:12 PM perry_j1987: if i command it to go 2000 i put meter on the pwm to 0-10v module and trimmed the pot to be steady 10v
06:12 PM perry_j1987: so thats working
06:13 PM perry_j1987: so now its should just be spindle encoder scaling right?
06:15 PM perry_j1987: nope
06:16 PM perry_j1987: ok now i think somethings funky with the VFD
06:16 PM perry_j1987: just probing around i command 2000 rpm and get 10v thats right
06:16 PM perry_j1987: 0 volts when 0 rpm ok
06:17 PM perry_j1987: so i command 2000 rpm it spins up and reads 10v
06:17 PM perry_j1987: then i tell it 1000 rpm the motor doesnt change speed so probe it and it reads 5v
06:17 PM perry_j1987: so thats odd
06:17 PM perry_j1987: the vfd still showed it was 60hz at 1000 rpm
06:49 PM perry_j1987: ah hah fixed
06:51 PM perry_j1987: there must have been a typo in the docs
06:51 PM perry_j1987: just went over vfd programing and there was a 1 where there should have been a 0
06:51 PM perry_j1987: now its responding as it shoud
06:51 PM perry_j1987: now to figure out near
06:53 PM roycroft: my vfds have a setting to set the spindle speed control source
06:54 PM roycroft: some vfds have a physical jumper setting for the source
06:54 PM roycroft: you might check your docs to make sure everything is set properly
06:58 PM perry_j1987: ya i just finished gonig through all that its all set right on the vfd end
06:58 PM perry_j1987: now im trying to figure out why spindle-at-speed isnt seem to be working
06:58 PM perry_j1987: the red led turns on when it ramps up and never turns green again
06:58 PM perry_j1987: so i assume its not close enough to commanded rpm for it to turn green etc
06:59 PM perry_j1987: i also need to figure how to fine-tune the actual rpm too
06:59 PM perry_j1987: if i tell it 2000 it reports about 2080ish
06:59 PM perry_j1987: if it tell it 500 its about 540ish right now
06:59 PM perry_j1987: er 520ish
07:02 PM Tom_L: i added a pid in linuxcnc for my bottom end rpm and it made a big difference
07:03 PM roycroft: i know i can tweak that with my vfds
07:04 PM roycroft: i would ask, though, if that slight discrepency in speed really matters much
07:04 PM roycroft: is it worth chasing down?
07:04 PM perry_j1987: it shouldnt for the most part i'd think
07:04 PM perry_j1987: threading is off the encoder so +/- some speed doesnt effect that either right?
07:04 PM roycroft: as long as it's repeatable, absolute precision doesn't matter that much
07:05 PM roycroft: or shouldn't matter that much
07:05 PM roycroft: i know it would bug me and i'd want to get it sorted, but i'd probably worry about other problems first
07:06 PM perry_j1987: aye
07:06 PM perry_j1987: so for now this spindle at speed
07:06 PM perry_j1987: its just the default one thats generated with the conf wizard
07:19 PM Tom_L: it increased my low end torque recovery quite a bit
07:24 PM perry_j1987: i'll have to look into that some time
07:25 PM perry_j1987: ok i am encountering a problem i remember having couple years ago but i forgot what it was
07:25 PM perry_j1987: testing out doing a thread and it just hangs there
07:25 PM perry_j1987: at that part of the gcode on g76 spindle running and what not but it wont do the thread
07:26 PM -!- #linuxcnc mode set to +v by ChanServ
07:26 PM -!- #linuxcnc mode set to +v by ChanServ
07:28 PM Tom_L: synchronized motion
07:29 PM perry_j1987: ya
07:29 PM perry_j1987: so somethin isnt right with the spindle encoder part of the config i take it
07:32 PM Tom_L: motion.spindle-index-enable
07:33 PM Tom_L: http://linuxcnc.org/docs/ja/html/man/man9/motion.9.html
07:33 PM Tom_L: For correct operation of spindle synchronized moves, this signal must be hooked to the index-enable pin of the spindle encoder.
07:33 PM Tom_L: net spindle-index-enable spindle.0.index-enable <=> hm2_[HOSTMOT2](BOARD).0.encoder.01.index-enable
07:34 PM Tom_L: mine
07:35 PM perry_j1987: i think the index was not inverted
07:35 PM perry_j1987: doing test now
07:35 PM perry_j1987: hmm still nope
07:35 PM perry_j1987: going over the old config vs the new one to see what other changes
07:36 PM perry_j1987: the old one worked
07:39 PM perry_j1987: hmm
07:42 PM perry_j1987: man i wish i could understand this config stuff easier lol
07:43 PM Tom_L: read
07:43 PM Tom_L: it will come
07:53 PM solarwind_: I just machined a simple shaft 15cm long, 2cm in diameter, that has a tolerance of 1µm along every point I measure it
07:53 PM solarwind_: I guess that means my lathe is holding its tolerances well
07:53 PM solarwind_: Final pass was done using a vertical shear tool
07:54 PM -!- #linuxcnc mode set to +v by ChanServ
07:54 PM -!- #linuxcnc mode set to +v by ChanServ
08:06 PM perry_j1987: i've gone thorugh the configs with a fine tooth comb
08:06 PM perry_j1987: cant figure out why its not threading i fired up the old config and it threads
08:07 PM perry_j1987: copy pasted the hal from the old conf into the new one and saved and restarted and still no threading just pauses odd
09:13 PM -!- #linuxcnc mode set to +v by ChanServ