#linuxcnc Logs
Sep 18 2025
#linuxcnc Calendar
12:36 AM lcnc-relay: <meisterdippel@> moin
01:50 AM Guest46: ???
02:20 AM lcnc-relay: <lucid.nonsense@> I'm not in the least bit qualified, but would be surprised if the RT kernel worked on a VM
02:22 AM lcnc-relay: <meisterdippel@> Guest46: should work for testing, but it's a bad idea running realtime stuff in VM
02:46 AM Guest46: I'm a beginner. I just want to use LinuxCNC for learning purposes. But why did it prompt me to restart after being installed in the VM, yet after restarting, it remained in a black screen state and has been like this for an hour?
02:47 AM Guest46: Can only be installed on Raspberry Pi.
03:47 AM lcnc-relay: <meisterdippel@> maybe vmware will not work with rt-kernels, other vm's do
04:10 AM Tom_L: morning
04:20 AM lcnc-relay: <TurBoss> mornign
04:37 AM lcnc-relay: <meisterdippel@> I need a PCB for differential encoder (ABZ) inputs and all the I/Os for my machine.
04:37 AM lcnc-relay: I'm now considering whether to build a daughter board for the Mesa 7c81 or one with its own FPGA (or dev board) on it.
04:58 AM jpa-: much easier to just interface to some mesa board
05:22 AM lcnc-relay: <meisterdippel@> jpa-: not realy, the 7c81 is only an FPGA with 5V shifter, i can also handle 3.3V on the IO board and an FPGA dev-board cost 1/3 of a Mesa-board
05:22 AM lcnc-relay: <meisterdippel@> and i can use OpenSource toolchains, no need for the old ISE
05:25 AM jpa-: what gateware & linuxcnc driver would you use with it? does hostmot2 work with other FPGA boards?
05:27 AM lcnc-relay: <meisterdippel@> hostmot2 only works with spartan6 and efinix FPGA's, but have my own for other FPGA's
05:30 AM Deejay: hi
05:33 AM lcnc-relay: <meisterdippel@> jpa-: https://github.com/multigcs/riocore/blob/dev/riocore/boards/README.md
05:37 AM jpa-: nice
05:46 AM lcnc-relay: <meisterdippel@> https://www.youtube.com/shorts/KLijHrYiQXw
07:11 AM rdtsc-w: Guest46, the rpi .iso is very particular and I would not be surprised at all if it did not work in a VM. Just put it on a rpi :)
11:59 AM lcnc-relay: <lesliet@> currently rtfm'ing, have found the linuxcnc user and integration manuals. Watching various vids on yt to wrap my head around what I need to know. Probably using mesa card, ac servos (unless I can find a nema 42 stepper that maintains 4nm across the speed range, and turns up to 3k rpm) So, I'm just wondering if there are other resources I should absorb?
12:00 PM lcnc-relay: <lesliet@> (heading back to work, responses will be slow)
12:11 PM BorgPipe_: do snapped bits usually make a ping noise ?
12:12 PM BorgPipe_: or a squeel then snap
12:14 PM Rab: In my experience it's generally a crack or pop. Fragments might ping off nearby surfaces.
12:16 PM rdtsc-w: lesliet, if you go the Mesa route, JT's mesact 2 will make 90% of a configuration for you; can even download and flash the card firmware (some frequent combinations of cards + add-ons are natively supported.)
12:27 PM rdtsc-w: squeal / chatter could be from a too fast/slow a feed rate, a dull/wrong type/wrong geometry cutter for that material, the material work-hardening (stainless), insufficient coolant/lubricant, etc. squeal = bad
12:31 PM lcnc-relay: <rs> lesliet@: 3krpm is not the domain of steppers. you can probably reach such speeds if you are careful, but useable torque will be very low.
12:45 PM rdtsc-w: if it were mine, I'd at least look into what it would take to re-use the existing drives and motors (assuming they all work.) sure, it's old and currently a wiring mess, but those parts are already suitable for that machine, and are mounted. might be easier/cheaper/better/faster to use existing than replace it all.
12:47 PM Rab: lesliet, which machine is this? (Just joined, sorry if you've already mentioned it.)
12:50 PM rdtsc-w: Rab, think he's doing work stuff at the moment - a Bridgeport V2E3: https://duckduckgo.com/?q=Bridgeport+V2E3
12:54 PM rdtsc-w: https://www.mattshaver.com/site.php?link=v2e3/index.htm drives appear to be Servo Dynamics - wonder if a manual for them can be found
12:55 PM Rab: rdtsc-w, cool, thanks. I would be naturally inclined to try reusing the existing servo stuff first. But since it's already essentially a factory "retrofit", fitting motors and drives might be easier than with a more specialized/tightly integrated machine.
12:55 PM Rab: +new
01:01 PM rdtsc-w: https://www.servodynamics.com/manuals
01:08 PM rdtsc-w: looks like it could be a SDSMB 1625-17
01:08 PM rdtsc-w: ok back to work here :)
01:11 PM Rab: If there's any issue with the drives I'd be more inclined to replace everything, both for motor maintenance reasons and because brushed DC drives aren't so easy to find these days.
01:13 PM Rab: Looks like standard +/-10V input, though, so should be easy to work with.
01:14 PM lcnc-relay: <skunkworks8841@> The thing is.. For as much as he is using the machine.. (granted I am making assumptions here) I bet he would never wear the brushes out.,
01:16 PM Rab: Not sure how much mileage is already on the machine, but maybe they're marginal now.
01:18 PM Rab: But ascertaining condition should be part of the project anyway.
01:19 PM peter__ is now known as pcw-at-home
01:20 PM pcw-at-home: I thought his machine had large Steppers, or am I mixing it up with another
01:22 PM lcnc-relay: <skunkworks8841@> different machine
01:26 PM lcnc-relay: <meisterdippel@> haha, i build the best charge-pump detector 😎 😇
01:27 PM lcnc-relay: <meisterdippel@> I thought about how best to do this so that it also works when the signal remains high or low. Sometimes it can be so simple.
01:28 PM lcnc-relay: <meisterdippel@> cheap, easy, rocksolid
01:30 PM rdtsc-w: window comparator? :)
01:30 PM lcnc-relay: <meisterdippel@> too complicated 🙂
01:33 PM rdtsc-w: you must have been studying https://www.romanblack.com/index.htm#elec :)
01:34 PM rdtsc-w: lots of miscellaneous goodies there
01:34 PM lcnc-relay: <meisterdippel@> signal -> nf-transformer -> rectifier -> transistor (+resistor and capacitor) -> Relais/SSR
01:36 PM lcnc-relay: <meisterdippel@> this only responds to clocked signals.
01:42 PM lcnc-relay: <meisterdippel@> and it is also galvanically isolated
01:49 PM lcnc-relay: <meisterdippel@> https://cserver1.multixmedia.org/charge-pump-detector1.jpg
01:50 PM lcnc-relay: <meisterdippel@> https://cserver1.multixmedia.org/charge-pump-detector2.jpg
02:01 PM rdtsc-w: nice, doesn't get much simpler and fool-proof than that
02:12 PM pcw-at-home: Thats how many of our I/O cards create DC ~2A SSRs (transformer --> voltage doubler --> MOSFET)
02:14 PM pcw-at-home: (Ethernet transformer as they contain common mode chokes for better HF AC isolation)
02:16 PM rdtsc-w: There's a certain line of Siemens VFDs which use (abuse?) three-winding gate-pulse transformers for isolated +/- power delivery :)
02:55 PM lcnc-relay: <meisterdippel@> https://cserver1.multixmedia.org/charge-pump-detector3.jpg
02:55 PM lcnc-relay: <meisterdippel@> https://cserver1.multixmedia.org/charge-pump-detector4.jpg
03:01 PM lcnc-relay: <meisterdippel@> need to go sleep, gn8
04:56 PM * JT-Shop stops looking at the forecast for the weekend... we are going rain or shine and just hope Saturday allows some track time
04:58 PM Unterhausen: apparently hexchat just gives up on reconnecting sometimes
05:00 PM JT-Shop: yup I've noticed that
05:00 PM xxcoder: I have set mine to never reconnect
05:00 PM JT-Shop: why?
05:00 PM xxcoder: no reconnect/disconnect spam
05:00 PM JT-Shop: ah that makes sense
05:01 PM lcnc-relay: <unterhausen@> xfinity is so bad that I would never be connected if I did that
05:01 PM JT-Shop: isn't that just local?
05:01 PM JT-Shop: or do you see me trying to connect?
05:01 PM xxcoder: local only on failure to reconnect
05:01 PM xxcoder: im talking about success then disconnect repeatively
05:02 PM xxcoder: like what your phone irc client does jt :)
05:02 PM lcnc-relay: <unterhausen@> I don't think I have ever seen that behavior
05:02 PM JT-Shop: yep the phone irc client is not the best
05:03 PM lcnc-relay: <unterhausen@> Is talla83 from utube on here?
05:04 PM JT-Shop: no clue
05:05 PM JT-Shop: we can't see who is on from the dark side
05:05 PM Tom_L: probably best that way
05:05 PM JT-Shop: lol
05:05 PM Unterhausen: I looked on irc first
05:05 PM Unterhausen: the inactive users on discord are really difficult to see on my browser
05:06 PM Tom_L: you can't adjust the colors?
05:06 PM JT-Shop: another reason I don't use discord
05:07 PM xxcoder: you can now, with pay
05:07 PM xxcoder: I dont bother
05:08 PM xxcoder: I only pay for minimal nitro, so i can use emojis on any server from any server
05:08 PM xxcoder: and rarely needed, larger files
05:09 PM Tom_L: sounds too much like a video game
05:10 PM xxcoder: theres people making open source version of discord
05:11 PM xxcoder: so it'd be more like irc where server owners can do more, and there can be more servers.
05:32 PM Tom_L: how many are in the discord channel?
05:33 PM lcnc-relay: <skunkworks8841@> 155
05:33 PM lcnc-relay: <skunkworks8841@> 156
05:33 PM Tom_L: if it's matrix here it doesn't show the '@' right?
05:34 PM Tom_L: i don't think matrix is all that active is it?
05:34 PM lcnc-relay: <skunkworks8841@> lol - I don
05:35 PM Tom_L: i think i tried it briefly
05:35 PM lcnc-relay: <skunkworks8841@> lol - I dont know how this all works. But all the IRC people say APP after their name
05:35 PM xxcoder: matrix, lcnc main channel very little, but qt channel, theres more matrix users
05:35 PM xxcoder: matrix shows their profile image on discord so thats how you can tell on discord
05:35 PM Tom_L: for probe basic?
05:36 PM xxcoder: qtpyvcp channel on discord matrix and irc
05:36 PM JT-Shop: yup probe basic is the only thing still alive for qtpyvcp
05:37 PM * Tom_L grabs another slice of pizza
05:38 PM xxcoder: bah im in mood for pizza lol
05:39 PM Tom_L: i think i'm gonna add a couple buttons to axis for a couple probe routines and see how that works out
05:44 PM JT-Shop: I "think" I'm ready to head out tomorrow
05:44 PM Tom_L: rain or shine
05:44 PM JT-Shop: yup
05:44 PM Tom_L: good luck
05:45 PM JT-Shop: thanks
05:45 PM xxcoder: have safe trip
05:45 PM JT-Shop: thanks
05:45 PM Tom_L: how are cup 2's in rain?
05:45 PM JT-Shop: less than ideal
05:45 PM JT-Shop: All Season is better in the rain
05:45 PM Tom_L: i figured
05:46 PM JT-Shop: dry track the cup 2's will stick like glue
05:46 PM JT-Shop: I hope
05:46 PM Tom_L: maybe you'll get to find out
05:47 PM JT-Shop: I hope so
05:47 PM Tom_L: they don't do any track prep do they?
05:48 PM JT-Shop: I've not seen any track prep but maybe they do it the day before dunno
05:48 PM Tom_L: sweepers etc
05:48 PM JT-Shop: I know at Ron Fellows in Parhump they use blowers to clean the tracks before dawn
05:52 PM JT-Shop: it's pretty surreal to hear the mechanics checking wheel torque between dawn and sunrise at Spring Mountain
05:53 PM Tom_L: clickety click click
05:53 PM JT-Shop: yup
05:53 PM Tom_L: did you get a larger torque wrench for that?
05:54 PM Tom_L: 1/2" drive
05:54 PM Tom_L: all i have is 3/8 drive
05:54 PM Tom_L: but it was big enough to do engine heads etc
05:54 PM JT-Shop: yup quite a while back I got 3 from mcmaster carr which are snap on iirc
05:55 PM JT-Shop: 150 is the big one
05:55 PM Tom_L: i remember that but didn't now how many
05:55 PM JT-Shop: you gave me the info
05:56 PM JT-Shop: interesting it seems to take more than 140 lb/ft to loosen the lug nuts
05:56 PM Tom_L: aluminum wheels?
05:57 PM JT-Shop: when the chief designer was asked about the torque increase he said that's what is needed to provide enough clamping force
05:57 PM JT-Shop: yup forged aluminum
05:58 PM JT-Shop: the C7 Grand Sport (wide body) the wheels would split a lot
05:58 PM Tom_L: i think the studs on NASCAR ones before they went to the single nut were bigger than your average auto
05:58 PM JT-Shop: I bet
05:58 PM Tom_L: kids brought back some lug nuts when we were out there
05:59 PM Tom_L: now they use a single nut
05:59 PM JT-Shop: the nuts are 22mm on the C8
05:59 PM Tom_L: i never checked theirs
06:00 PM JT-Shop: the C5-7 the torque is 100 ft/lb
06:00 PM JT-Shop: the C3 is 80 ft/lb
06:00 PM JT-Shop: dunno what the C4 is
06:02 PM JT-Shop: it lcvette is here he whould know
06:03 PM Tom_L: i'm sure
06:03 PM JT-Shop: he built an amazing C4
06:03 PM Tom_L: is he in Ca?
06:04 PM Tom_L: not sure i ever knew
06:04 PM JT-Shop: South Carolina
06:04 PM Tom_L: ahh ok
06:04 PM JT-Shop: by the coast iirc
06:05 PM Tom_L: been over the cavenagh bridge a couple times
06:06 PM JT-Shop: I think we'll stop at Mary Jane's in Perryville for lunch tomorrow
06:06 PM Tom_L: sounds like a good plan
06:06 PM * JT-Shop calls it a day
06:07 PM JT-Shop: they have some good burgers
06:07 PM Tom_L: i bet
06:08 PM Tom_L: for home cooking we get the angus burgers from sams
06:09 PM lcnc-relay: <skunkworks8841@> we have been getting frozen burgers from aldi's
06:10 PM lcnc-relay: <skunkworks8841@> they are pretty good. but now that I have some actual real meat (1/4 of a cow) I have been making burgers. The kids like them better
06:12 PM lcnc-relay: <skunkworks8841@> they opened up a raising canes here.. we went there for supper today. I is ok.
06:12 PM lcnc-relay: <skunkworks8841@> *it is ok
06:13 PM xxcoder: I keep misreading that as raising cain
06:13 PM xxcoder: which is very different. no idea why either
06:18 PM lcnc-relay: <lesliet@> Rab: These aren't a retrofit, they were CNC as originally built. I looked at possibly reusing the old dc servos and drives, but it gets expensive fast. Less cost and less complicated to get a set of AC servos and drives. Nema 42 is a bolt on. The old DC servos are missing some parts, and are 43 years old, the wiring panel is missing parts as well. One of the transformers is missing, too. The existing drives are not complete drives,...
06:18 PM lcnc-relay: ... they have some of the signals going to other boards and it looks like a major headache to figure out, The DC servos on it are powertronics, with 250 line encoders.
06:18 PM lcnc-relay: <lesliet@> so, apparently Raising Cane is named after the founder's Labrador
06:18 PM lcnc-relay: <lesliet@> gotta be connected to the common saying, though
06:23 PM Tom_L: they have a raising canes here as well
06:29 PM Tom_L: seems there's a chicken place on every other block here
07:05 PM rdtsc: part-out those pieces and sell them intact on ebay or something - recoup some of the expense
07:18 PM lcnc-relay: <lesliet@> p much what I was thinking
07:19 PM lcnc-relay: <lesliet@> clean the cabinets out and fresh paint, relocate the vfd into the top cabinet for noise isolation
07:21 PM lcnc-relay: <lesliet@> not sure what the person who mounted the vfd outside a cabinet, next to the column was thinking
07:22 PM lcnc-relay: <lesliet@> found the mesact 2 stuff on github, and bookmarked, thanks!
07:49 PM Tom_L: lesliet, https://www.gnipsel.com/linuxcnc/mesact/index.html
07:49 PM Tom_L: help
08:49 PM xxcoder: wow.
08:49 PM xxcoder: samsung is adding ads to refs
08:49 PM xxcoder: glad mine arent samsung, and not smart one
09:06 PM lcnc-relay: <lesliet@> Tom_L: thanks!