#linuxcnc Logs

May 09 2020

#linuxcnc Calendar

12:40 AM Deejay: moin
06:27 AM JT-Cave: morning
07:01 AM Tom_L: morning
07:13 AM Tom_L: 42°F
10:19 AM Eric__: we got 36F still. I guess I won't go ride my bike up in the forest today
10:23 AM highoctane: Anyone ever have linuxcnc freeze when you press the Ok button after choosing a configuration from the opening configuration screen?
10:24 AM highoctane: (Trying to run the simulator after building from source on Ubuntu 14.04)
10:25 AM Eric__: google results for linuxcnc ethenet mesa setup are badly polluted by whatever a smoothstepper is
10:26 AM Eric__: highoctane, maybe run it from a terminal and see if there are error messages?
10:29 AM highoctane: Eric__ good suggestion. I have done that, and no errors are reported in the terminal. Maybe there are some log files I can check?
10:33 AM Eric__: what configuration are you trying to run? Realtime kernel?
10:34 AM highoctane: I am intending to run just the simulator
10:35 AM Tom_L: Eric__, you lookin for an ethernet card?
10:35 AM Tom_L: 7i92 7i80 are a couple
10:37 AM highoctane: Eric__ I don't believe I have built it with realtime kernel enabled, but do you know of a way to check and see?
10:45 AM Eric__: I think uname -a will tell you if it has an RT kernel
10:45 AM Eric__: but not sure
10:48 AM Eric__: Tom_L I bought a 7i91 I think I just need a little help getting going with it, forgot everything I know from setting up the 5i20
10:50 AM Tom_L: what do you need to know? it's likely the 7i92 as i don't see a 7i91
10:50 AM Eric__: 7i93
10:51 AM Tom_L: ok so you needed the wide connector
10:51 AM Eric__: I have daughter cards
10:51 AM Tom_L: yeah
10:51 AM Tom_L: iirc default ethernet addy is
10:52 AM Tom_L: set your pc ethernet card up static ip in that range but not that address
10:52 AM Tom_L: i set mine at iirc
10:53 AM Eric__: good point. Nothing else for the ethernet port?
10:56 AM Eric__: manual says default ip is 192.168.1.something. I guess that's wrong?
11:01 AM Eric__: I have a 7i37 7i48. Any idea what firmware to run?
11:01 AM pcw_home: There is a jumper option for or
11:02 AM Tom_L: yeah i forgot which was the default
11:07 AM Eric__: as shipped should be That address is not mentioned in the manual at all ever
11:09 AM pcw_home: the default jumper setting but is suggested for final installation
11:10 AM pcw_home: I;ll fix the manual, its fixed in other manuals cards but looks like it missing from the 7I93 manual
11:11 AM pcw_home: at some point we changed our initialization to preset the EEPROM address to
11:23 AM Eric__: okay, thanks. Was wondering if I should check another manual
11:23 AM Eric__: pcw_home any advice on firmware for 7i37 7i48?
11:33 AM pcw_home: I don't think there are any 7I48 bitfiles in the 7I93 dist, let me cobble something up...
11:47 AM pcw_home: http://freeby.mesanet.com/7i93_7i48.zip
11:51 AM Tom_L: nothin like kurbside service
11:58 AM Deejay: hi
12:08 PM Eric__: thanks, I guess I gotta go try it now
12:16 PM justan0theruser is now known as justanotheruser
12:18 PM pcw_home: if you have a 5I20 configuration, it should be mostly portable
12:29 PM Eric__: been a long time since I messed with it, but I'll check
12:35 PM _unreal_: hello
12:57 PM Thorhian: skunkworks: Is this your youtube channel? https://www.youtube.com/user/samcoinc/videos
01:11 PM andypugh: Does anyone here do production milling? I am trying to guess how much it would cost to have 180 of a part made.
01:12 PM andypugh: https://a360.co/3chgnCo
01:13 PM andypugh: Should take you to a viewer for the model
01:13 PM andypugh: The space between the pins is about 3mm
01:14 PM Tom_L: andypugh, the asrock made it all the way thru the preempt-rt test
01:14 PM andypugh: THat’s good for preempt, and takes the potential blame off of some parts of linuxCNC.
01:15 PM Tom_L: you don't wanna make those parts?
01:15 PM Tom_L: i'd stack em for the 'comb' part
01:16 PM andypugh: I don’t really want to make 180 of them.
01:16 PM andypugh: If you stack them then the gap between the teeth is < 1mm
01:17 PM Tom_L: no, i mean the other direction
01:18 PM Tom_L: parts of it will be one off
01:18 PM Thorhian: Hey andy, do you have any experience using the Raspberry Pi 4 with LinuxCNC? I was thinking of getting a 7C80 mesa board as well.
01:18 PM Tom_L: Thorhian, why not ethernet?
01:18 PM andypugh: I made a little lathe wirh with a Pi and an ethernet Mesa card last summer.
01:19 PM andypugh: A very small lathe, but we got it threading: https://photos.app.goo.gl/zDMTmn2PqRJDYBFK9
01:19 PM Tom_L: ahh nevermind, i see now those are hex
01:20 PM Tom_L: what a pain
01:21 PM andypugh: Thorhian: LinuxCNC is currently buildiing packages for the Pi.
01:22 PM andypugh: I am not sure where the kernel package is, though.
01:24 PM Thorhian: Tom_L: I have heard about occasional hiccups in the ethernet connection to Mesa cards from RPi according to what I think is skunkworks youtube channel.
01:25 PM Tom_L: it is his channel and he's been running his for a good while now
01:25 PM Thorhian: Yeah, I was just wondering if there are any pitfalls I should be awater of andypugh ?
01:25 PM Tom_L: once he found the sweet spot i think it's been running pretty good
01:26 PM Tom_L: you could also try spi with a 7i90 etc
01:26 PM andypugh: Well, it’s not super fast, but the Pi4 is probably faster than the Atoms we used to use.
01:26 PM Tom_L: really?
01:26 PM Thorhian: I know it's not super fast but it is multicore and runs at 1.5GHz with proper cooling along with disabling frequency scaling.
01:26 PM Tom_L: maybe i should get one to play with
01:26 PM pcw_home: It does seem faster than a D525 for example (even with isolcpus = 1,2,3)
01:27 PM Tom_L: i'm still running the d525
01:27 PM Thorhian: Plus I doubt an Atom CPU + iGPU could run dual 4K displays in a non-linuxcnc situation.
01:27 PM Tom_L: buster even looked decent on it if the rtai can get worked out
01:28 PM CaptHindsight: RTAI should work on Buster, it works on Sid
01:29 PM Tom_L: seemes to break down with andy's test
01:29 PM Thorhian: Are there any pros/cons between running with a Ethernet Mesa card vs SPI?
01:29 PM Tom_L: ethernet requires a slower servo thread, i'm not sure about spi
01:30 PM CaptHindsight: Thorhian: Ethernet is easily extended to many many meters
01:30 PM Tom_L: you need a real short connection using spi
01:31 PM Thorhian: I mean, I plan on having the Pi and Mesa card close to eachother, probably in the same electrical box along with the stepper drivers and PSU (or is that a bad idea?). Distance isn't much of an issue in that case.
01:31 PM CaptHindsight: i don't keep track of the Rpi progress, is SPI to Mesa rock solid?
01:31 PM pcw_home: 1 KHz Ethernet seems OK on my RPI4 setup but I've only just started messing with Ethernet/RPI
01:32 PM andypugh: 7c80 plugged stright in to the Pi couldn’t be mich shorter
01:33 PM pcw_home: I've got more than a year of RPI3 and RPI4 / hm2_rpspi uptime with no issues
01:33 PM Thorhian: Technically the 7c80 is rated for 50MHz SPI communication according to the docs I read? Is that correct?
01:33 PM CaptHindsight: pcw_home: good to know
01:34 PM pcw_home: Yes with an optimal SPI master I think you are limited to about 40 MHz on TX and 25 MHz on RX with a RPI
01:36 PM CaptHindsight: we went below 32F last night (0C)
01:37 PM andypugh: RTAI doesn’t work on ARM. Preempt-RT is the only option.
01:42 PM CaptHindsight: pcw_home: which ethernet controllers seem to work better in laptop applications and hm2_eth
01:43 PM Thorhian: Well, it seems SPI seems to be the more reliable option according to pcw_home then.
01:43 PM Thorhian: At least for RPi4
01:44 PM CaptHindsight: until there is more testing
01:45 PM pcw_home: Ethernet should be OK but it has not had as much testing (since it was not a great option on RPI3)
01:46 PM pcw_home: CaptHindsight: Intel of RealTek are both good, stay away from offbrands like Atheros
01:55 PM pcw_home: CaptHindsight: The latest (actually working) xy2mod driver has now been merged into master (thanks jepler)
01:55 PM pcw_home: it does requite current firmware as well
01:55 PM pcw_home: require
01:56 PM Tom_L: what's involved in updating firmware?
01:56 PM Tom_L: same as loading a bit file?
01:56 PM pcw_home: yes
01:57 PM Tom_L: is it packaged in the board zip files?
01:57 PM Thorhian: I guess Ill go with the more tested option then pcw_home, Ill go ahead and order a 7c80.
01:58 PM pcw_home: but there are no bitfiles for the latest xy2mod firmware except on this computer (though the source in the zipfiles has been updated)
01:59 PM Tom_L: i just use these to test for now
01:59 PM Tom_L: no big rush but it might be worth doing at some point
02:01 PM Thorhian: Tom_L: Is the 7i90 good? It seems you have to buy daughterboards with it to do anything.
02:01 PM Tom_L: it requires daughter cards yes
02:01 PM Tom_L: i like it
02:04 PM Thorhian: It says in it's product description that it can produce step gen, encoder counting, pwm generation, digital I/o and more, but you need the daughter cards to actually connect stepper drivers and encoders along with other stuff like spindle control. The 7C81 seems to be similar but oriented to the RPi
02:05 PM Tom_L: yes
02:06 PM Tom_L: some of the newer mesa cards are designed to be all in one
02:07 PM Thorhian: Yeah, 7C81 is the non-all-in-one board specifically for RPI. Only $89, but I'm not sure if that or the 7i90 would be better in my case.
02:07 PM Thorhian: The 7C80 is the all-in-one board for RPi.
02:08 PM Thorhian: Lol these boards are all capable of so much it's hard to choose lol
02:10 PM andypugh: If you are building a “normal” machine using a Pi then I would say 7C80.
02:12 PM andypugh: It’s about the same as a 7c81 + 7i76 for about the same price.
02:12 PM Tom_L: does the 7c80 have any analog out for spindle etc?
02:12 PM andypugh: Yes, and encoder in
02:12 PM Tom_L: cool
02:12 PM Thorhian: Yep, http://store.mesanet.com/index.php?route=product/product&path=83_85&product_id=345&sort=p.sort_order&order=ASC
02:13 PM Tom_L: Thorhian, where are you located?
02:13 PM Thorhian: andypugh: I guess I'll just get the 7c81. However, why would one want the 7i90?
02:14 PM Thorhian: Tom_L: USA, MST time zone ;)
02:14 PM Tom_L: jt is a distributor for mesa also: mesaus.com
02:14 PM Thorhian: jt?
02:15 PM Tom_L: and isn't as busy developing so you might get it quicker
02:15 PM Tom_L: he's also on here
02:15 PM Tom_L: probably hangin out with the chickens
02:15 PM andypugh: 7i90 (and other ethernet cards) can be useful if you want the PC and controller a long way apart. Ethernet is also the only option with sme PCs that don\t have p-port or PCI slots, NUC etc.
02:16 PM Tom_L: ethernet does require preempt-rt
02:16 PM Tom_L: andypugh, didn't you say the pi does also?
02:16 PM Thorhian: Okay, I know the 7i90 also does SPI. Also you want preempt-rt don't you?
02:16 PM andypugh: For Etheret yes, and also for Pi.
02:17 PM Tom_L: i don't have a rpi but i'm using the 7i90 on a parallel port with rtai on my mill
02:17 PM Tom_L: it has 3 interfaces iirc
02:18 PM Thorhian: I dont think JT has the RPI cards Tom_L
02:18 PM Thorhian: http://mesaus.com/raspberry-pi-4-solutions/
02:18 PM Thorhian: lol
02:19 PM Tom_L: jt tries to simplify things for users
02:19 PM Tom_L: and the pi is a fairly new option
02:20 PM Thorhian: Well looks like I will be using the mesa shop then :/
02:20 PM Thorhian: They are located in California which isn't super far away either compared to east coast states.
02:21 PM Tom_L: jt is in Mo
02:21 PM Thorhian: In Montana? Dang, that would be quick. is jt's username "jt-Cave", trying not to ping him.
02:21 PM Tom_L: Missouri
02:22 PM Thorhian: Oops.
02:22 PM Thorhian: Well Cali would be closer then. Guess I'll order soon. Thanks Tom and andypugh!
02:30 PM elmo40: andypugh: that is a sweet looking tiny lathe!
02:31 PM elmo40: i have one of these i'd like to turn into CNC :-)
02:32 PM elmo40: https://www.aliexpress.com/item/32228223149.html
02:32 PM elmo40: actually, 2 of them. one setup as a lathe the other a mill.
02:32 PM elmo40: could be nice having them both setup with lcnc
02:33 PM andypugh: I think the micro lathe was one of these: https://www.axminstertools.com/axminster-model-engineer-series-c1-micro-lathe-505101
02:34 PM andypugh: It turned out to be quite a neat CNC conversion, and we did the conversion in one day.
02:35 PM Tom_L: is there a certain rpi4 to get?
02:35 PM Tom_L: more ram i suppose is good
02:35 PM XXCoder: more current link https://www.aliexpress.com/item/32364704636.html 101 usd looks like
02:35 PM XXCoder: tom dont get 1 gb model, its same price as 2 gb one
02:36 PM XXCoder: 292 usd for 8 in 3. https://www.aliexpress.com/item/538035205.html
02:36 PM Tom_L: wasn't the unimat similar?
02:39 PM andypugh: The 4GB one is a lot more expensive. But still not very expensive.
02:40 PM Tom_L: $66 us
02:40 PM andypugh: I would also recoomend this style of passive-cooled case: https://www.amazon.com/Metal-Raspberry-Heatsink-Thermal-Adhesive/dp/B07VMD25SK
02:40 PM Tom_L: that was the next question :)
02:40 PM andypugh: It makes the whole thing a lot more rugged feelig.
02:41 PM XXCoder: yeah its still good idea even past patch that fixes bug that heated pi4s
02:41 PM CaptHindsight: ^^ is the case I use and have been overclocking the Rpi4 to 2GHz for months
02:42 PM andypugh: Or, make one of these: https://hackaday.com/2019/06/25/the-cheese-grater-in-fusion-360/
02:42 PM CaptHindsight: max case temp has been ~36C in a 19C ambient
02:42 PM elmo40: andypugh: that is a very inexpensive rpi4 case! i like it.
02:42 PM Tom_L: do you need a certain programming cable etc for it?
02:43 PM CaptHindsight: 2GHz on the core clock and GPU running a 4K display, think the GPU clock is at max as well
02:43 PM XXCoder: tom nah just need sd reader in case you mess it so bad it cant boot.
02:43 PM XXCoder: you can then just flash again into sdcard
02:44 PM CaptHindsight: Tom_L: yeah reflash SD card in a minute or two
02:44 PM Tom_L: my sole purpose would be to test lcnc with it
02:44 PM CaptHindsight: fix attempts always take longer
02:44 PM Tom_L: agreed
02:45 PM XXCoder: will we get rpi4 images as download someday?
02:45 PM Tom_L: should yes
02:45 PM Tom_L: it's in the build cycle now
02:45 PM XXCoder: cool. i want to run machines off my rpi4 sometime
02:46 PM Tom_L: afik anyway
02:47 PM Tom_L: https://www.amazon.com/Raspberry-Model-2019-Quad-Bluetooth/dp/B07TC2BK1X/ref=sr_1_3?crid=2C0UFERZVMK87&dchild=1&keywords=rasberry+pi4+4gb&qid=1589053568&sprefix=rasberry+pi4+4g%2Caps%2C200&sr=8-3
02:47 PM Tom_L: doesn't look so bad
02:47 PM XXCoder: lemme link one i got a second
02:47 PM Tom_L: 4g
02:48 PM XXCoder: https://www.amazon.com/gp/product/B07XTQL6YZ/
02:48 PM andypugh: XXCoder: Rpi4 debs have been on the buildbot for months now
02:48 PM XXCoder: nice
02:48 PM Tom_L: i don't need all the extras do i?
02:49 PM XXCoder: some is nice to have. like switched usb cable
02:49 PM andypugh: You might want a properly-rated power supply
02:49 PM XXCoder: makes it easy to power down when not using
02:49 PM XXCoder: yep
02:49 PM Tom_L: andypugh, what's it rated at? i got dozens of those
02:50 PM Tom_L: i've got a 12v 8A 12v 5A
02:50 PM Tom_L: used on my itx with the pico psu
02:50 PM Tom_L: looks like they use a 5v supplyu
02:51 PM andypugh: You need a USB power supply, USB-C output and a solid 3A I think. The average phone charger is a bit weak.
02:52 PM Tom_L: k, i've got several 'fast chargers' for android
03:15 PM Tom_L: yeah that kit is probably best
03:18 PM elmo40: Tom_L: always get the extras!
03:18 PM elmo40: life is too short to live with 'stock' ;-)
03:22 PM Tom_L: yeah, i just got lots of 'extra' junk just sitting on the shelf though
03:38 PM elmo40: i have some extra junk sitting around my belt line...
03:38 PM elmo40: and my garage is full of too much junk! :-P
04:04 PM Deejay: gn8
04:16 PM _unreal_: ARG... had to take a break from screwing with my cnc
04:16 PM _unreal_: running wires in the drag chains
04:20 PM Tom_L: fun ehh
04:45 PM Thorhian: Just ordered my RPi4 along with that metal case along with a 64GB uSD card and 3A USBC powersupply. Hopefully it will all get here this coming week.
04:45 PM _unreal_: no
04:45 PM _unreal_: not fun
04:46 PM _unreal_: I've been cutting short sections of heat shrink to keep the wires neat
04:46 PM _unreal_: and heating
04:46 PM _unreal_: must better then using zip ties
04:46 PM _unreal_: When I'm done I'll likely just put a few zip ties holding the entire bundle together
04:48 PM elmo40: _unreal_: you not done with your machine yet?
05:07 PM _unreal_: qfuck no
05:08 PM _unreal_: I dont get time to do stuff
05:08 PM _unreal_: remember I'm helping my father stage 4 cancer and getting better
05:12 PM dirty_d: I think I might have found a bug, unless I'm doing something wrong. If I use coordinate system rotation, the DRO shows the relative position in the rotated coordinate frame, but halui.axis.x.pos-relative shows the relative position as if it were not rotated at all.
05:15 PM andypugh: Ah yes, that’s believable.
05:16 PM andypugh: halui is backcalculating from the axis positions, whereas the GUI is showing the G-code command.
05:16 PM andypugh: It is entirely possible that halui can’t “see” the rotation value.
05:18 PM dirty_d: hmmm, ill look at the code
05:27 PM dirty_d: *(halui_data->axis_pos_relative[0]) = emcStatus->motion.traj.actualPosition.tran.x - emcStatus->task.g5x_offset.tran.x - emcStatus->task.g92_offset.tran.x - emcStatus->task.toolOffset.tran.x;
05:28 PM dirty_d: it doesn't look like the rotation value is in any of those structures, emcPose, or pmCartesian
05:28 PM andypugh: That was my suspicion.
05:28 PM dirty_d: where do you think the rotation should actually be stored?
05:29 PM andypugh: It might only exist in the interpreter.
05:30 PM Thorhian: Hey andypugh, what kind of cable would I use to wire a 7i76 card to the 26 pin of the 7C81? Would this work:
05:30 PM Thorhian: http://store.mesanet.com/index.php?route=product/product&path=74_79&product_id=315
05:31 PM andypugh: dirty_d: The Python module might have it: https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/usr_intf/axis/extensions/emcmodule.cc#L326
05:33 PM dirty_d: andypugh, it's also in the c++ EMC_TASK_STAT class, rotation_xy
05:33 PM andypugh: can halui see that?
05:33 PM dirty_d: yea it can
05:34 PM dirty_d: emcStatus->task.rotation_xy
05:35 PM andypugh: Well, if you fancy making a pull request..
05:36 PM dirty_d: sure
06:31 PM TurBoss: hello
06:31 PM TurBoss: I can see you but not sure if others can
06:32 PM andypugh: Who?
06:32 PM TurBoss: does anyone see Lcvette hmessages here?
06:33 PM andypugh: I see Lcvette in the list, but no messages.
06:33 PM TurBoss: ok thanks
06:41 PM dirty_d: andypugh, do you know what's causing this error trying to rip? "This script is only useful on run-in-place systems."
06:41 PM dirty_d: this has happened before and it took me forever to figure out what was wrong, but I don't remember
06:41 PM dirty_d: oh, is it because i passed --prefix to configure?
06:42 PM andypugh: It generally means that you didn’t configure for run-in-place when compiling.
06:47 PM dirty_d: not setting --prefix fixed it
06:54 PM Lcvette: hello
06:54 PM TurBoss: not here
06:55 PM TurBoss: oops
06:55 PM TurBoss: sorry wron window
06:55 PM Lcvette: can you see me now?
06:55 PM Tom_L: no
06:56 PM Lcvette: Tom_L: Hurray!
06:56 PM Lcvette: Tom_L: you have a lathe with linuxcnc?
06:57 PM Lcvette: we need a lathe guru to help us polish off the last few questions we have in the probe basic lathe gui
06:57 PM dirty_d: I made a thing today https://photos.app.goo.gl/CQiDAjMcqfaSm2hr6
06:58 PM Tom_L: no
06:58 PM dirty_d: https://photos.app.goo.gl/EhFUteqnCnQvW8wv8
06:58 PM Tom_L: no cnc lathe
06:58 PM XXCoder: dirty_d: nice
07:00 PM dirty_d: and to think, I was worried if the tape method would be strong enough
07:00 PM dirty_d: I had to break out a mallet
07:00 PM XXCoder: carpet tape?
07:00 PM Lcvette: anyone on here with linuxcnc cnc lathe experience?
07:00 PM dirty_d: its just blue masking tape on the table, and bottom of the work, then super glue on one surface, and activator on the other
07:01 PM dirty_d: I've yet to have it fail
07:01 PM XXCoder: ah superglue. strong but brittle
07:01 PM _unreal_: Tom_L, your are suposed to have a cnc lathe
07:01 PM _unreal_: now march....
07:02 PM Tom_L: not as much demand for them as mills
07:02 PM jdh: I have a mostly cnc'ed 9x20, but it is covered up with other stuff
07:03 PM Lcvette: I am trying to resolve some things im not clear on for the latghe interface being new to lathes myself
07:04 PM Lcvette: and since im the blind making an interface for lathe users, im pretty sure its gonna have some problems
07:04 PM Lcvette: lol
07:04 PM Tom_L: like what?
07:08 PM Lcvette: all the css, rpm mode, unit per rev mode,
07:08 PM Lcvette: crap my riot stopped working again
07:20 PM Tom_L: skunkworks, you around?
07:21 PM * Lcvette uploaded an image: Screenshot_2020-05-09_20-06-29.png (173KB) < https://matrix.org/_matrix/media/r0/download/matrix.org/KtmogsEKjeFAspyxOHqzqeKE >
07:21 PM Lcvette: bottom right corner
07:21 PM Lcvette: very confusing
07:22 PM Lcvette: i have them tied to mdi buttons gor G94, G95, G96, G97 i made them auto exclusive
07:22 PM Lcvette: and added boxes for S and F words
07:22 PM Lcvette: but not sure if that is correct
07:22 PM Lcvette: need someone who uses those functions to help hash out if i have it setup right or what to change to make it right
07:25 PM Tom_L: also, some lathes the tools come in from the back side
07:25 PM Lcvette: yeah we are handling that
07:26 PM Lcvette: easy enough to swap the backplot
07:26 PM Lcvette: and i got it covered in the tools i think
07:27 PM * Lcvette uploaded an image: Screenshot_2020-05-09_20-26-34.png (250KB) < https://matrix.org/_matrix/media/r0/download/matrix.org/cTJPWTJXJmYWzFfvYHEmPNlF >
07:31 PM jdh: Looks cool
07:48 PM Thorhian: Quick question, when I buy a Mesa 7C81 with a 7I76, should I get the current sourcing output version of the 7I76 or and the current sinking output version?
08:08 PM Tom_L: depends on your needs
08:09 PM Thorhian: The problem is that even after looking what current sourcing and sinking is I am still unsure how it affects the use of cards and how they are wired :/
08:10 PM jdh: depends on what outputs you are driving and what they need.
08:10 PM pcw_home: I'd probably avoid the sinking version (since they are out of stock) though mesaus may have some
08:11 PM pcw_home: Sinking is mainly for retrofits where the existing wiring is for sinking drivers
08:13 PM Thorhian: Oh I'm dumb. It's refering to the output pins (like for the stepper drivers). For some reason I was thinking of the connection between the 7C81 and 7I76 *facepalm*
08:16 PM pcw_home: the step/dir signals are sinking, sourcing, or differential, depending on wiring
08:16 PM Thorhian: I better double check my stepper drivers, I only know that they expect a 5V to 24V signals.
08:23 PM Thorhian: According to the documentation pcw_home, my stepper drivers can accept differential and "single-ended" inputs).
08:24 PM Tom_L: you probably want source
08:30 PM Thorhian: Sounds good tom
09:55 PM veegee: Anyone know of an easy trick to flush most of the liquid out of the water lines in my TIG torch so it doesn't leak all over the floor when I swap torches?
09:55 PM veegee: What I do now is just plug it into the argon line and tap the pedal to activate the gas for a few seconds. That works, but I'd rather not waste the gas
09:56 PM veegee: What do professional welders do?
09:57 PM Tom_L: dunno, can you leave the argon off and tap the pedal?
09:58 PM Tom_L: or are you using the gas pressure to purge the line?
09:59 PM Tom_L: air compressor would do that
10:03 PM veegee: Yeah just using the gas pressure to purge the line, with the other end pointing back into the reservoir
10:03 PM veegee: Yeah could hook up my air compressor to that, true
10:07 PM veegee: I just plug it into the gas port because it's the same coupler: https://canadaweldingsupply.ca/collections/tig-cable-connectors/products/ck-worldwide-qdgap-gas-cooled-quick-connect-fitting
10:08 PM Tom_L: yeah