#linuxcnc Logs

Aug 31 2022

#linuxcnc Calendar

12:24 AM mrec: andypugh: seems like you did gear hobbing already, it should be possible to use it via parallel port too no?
12:33 AM mrec: I'm getting a bit sick of cutting tooth by tooth it takes too long
12:45 AM Deejay: moin
01:38 AM randy: morning
03:03 AM mrec: did anyone do gear hobbing with linuxcnc?
03:11 AM Tom_L: yes
03:13 AM Tom_L: https://www.youtube.com/watch?v=ZhICrb0Tbn4
03:14 AM Tom_L: https://www.youtube.com/watch?v=xdE46yvckbM
03:18 AM cpresser: 12 years ago^^
03:19 AM XXCoder: its been a while lol at april 2010 I was just finishing off my college years
04:01 AM mrec: I saw Andy Pugh's video already.
04:02 AM mrec: I'm trying to use an AS5047P magnetic encoder with it
04:58 AM JT-Cave: morning
06:24 AM roscogamer[m]: Oké I have a weird question
06:25 AM roscogamer[m]: Can I address the pins on the 25pin mesa Conector
06:25 AM roscogamer[m]: Cus I kinda want my Mesa 7i96s to have a rs485 port for spindle Controll
06:37 AM JT-Cave-: the 7i96s has a rs-422/rs485 port
06:38 AM rs[m]: always funny how every alarm in every chat client goes off if rs485 is mentioned. guess i should fix the nick name.
06:39 AM * CloudEvil is annoyed the RS232 interface lead song got struck on youtube
07:33 AM roscogamer[m]: Isn't that one for smart serial controll
07:37 AM roscogamer[m]: Or can I trow a rs485 "switch" in there
07:40 AM JT-Cave-: hmm the manual says it's ntended for I/O expansion with smart serial devices
07:58 AM skunkworks: pcw--home: you around?
08:06 AM roscogamer[m]: So no rs485 Controll for my vfd?
08:09 AM roscogamer[m]: Or can I use the expansion header for that with some control board
08:12 AM jpa-: so far the most common way appears to be just usb-rs485 adapters, even though they can have a latency of few milliseconds
08:13 AM roscogamer[m]: Hmm
08:13 AM roscogamer[m]: Thing is I don't have many USB poorts free
08:14 AM roscogamer[m]: Or can I use a USB hub with lcnc
08:14 AM jpa-: should work
08:14 AM roscogamer[m]: Hmm
08:15 AM roscogamer[m]: Also can I program what the 25pin Conector does
08:15 AM roscogamer[m]: Like I could possibly make my own pcb for it
08:15 AM roscogamer[m]: Since I kinda rly don't want to use a USB thing if I can somewat help it
08:16 AM jpa-: you can program it in either VHDL running on the FPGA for fast control, or in C running in HAL for slower control
08:16 AM jpa-: AFAIK there is already a mesa UART component that could mostly do RS485, but there is no good way to interface it to LinuxCNC HAL so it would require some custom C code
08:17 AM roscogamer[m]: Oh
08:17 AM roscogamer[m]: I mean in hal is fine
08:18 AM roscogamer[m]: Like it's only start stop and speed feedback I want
08:18 AM jpa-: doesn't the VFD support PWM or analog input?
08:18 AM roscogamer[m]: It does
08:18 AM roscogamer[m]: But then I don't have speed feedback
08:19 AM jpa-: doesn't it have speed / tachometer output signal?
08:19 AM roscogamer[m]: It's a optidrive e3
08:19 AM roscogamer[m]: Not sure I can look
08:21 AM skunkworks: this is a vfd?
08:21 AM roscogamer[m]: Yea
08:21 AM roscogamer[m]: A optidrive e3
08:21 AM jpa-: looks like parameter P-25 Analog Output Function has option for motor speed
08:22 AM roscogamer[m]: Hmm
08:22 AM jpa-: but yeah, considering it only has one output you can't get both motor speed & current info
08:22 AM roscogamer[m]: Then I can use that to sense the speed with a analog input I'm guessing?
08:22 AM skunkworks: The k&T has a vfd running the spindle with no feedback.. PWM into it. (or maybe 0-10v) and it is scaled and seems to track 'good enough' for us
08:23 AM roscogamer[m]: Like I send it 0-10v and it sends 0g10v back
08:23 AM skunkworks: try it open loop
08:23 AM jpa-: yeah, i'd expect the VFD to have its own control loop considering it is a vector control one, so you might be fine with just the "at target speed" relay output and use the analog output to get information about maximum load
08:23 AM roscogamer[m]: And I I were to use a USB thing
08:23 AM roscogamer[m]: Witch one whould I use
08:24 AM roscogamer[m]: And how would I integrate it
08:24 AM jpa-: https://github.com/aekhv/vfdmod supports many models
08:25 AM skunkworks: (it actually has feedback but I never closed the loop)
08:26 AM roscogamer[m]: I don't need a closed loop
08:26 AM jpa-: https://www.seeedstudio.com/USB-TO-RS232--RS485--TTL-Industrial-Isolated-Converter-p-3231.html something like this is pretty ok AFAIK
08:26 AM roscogamer[m]: I just kinda wanna know if its doing what I told it to
08:26 AM roscogamer[m]: Wait
08:26 AM roscogamer[m]: That's like the defenition of closed loop
08:26 AM skunkworks: lol
08:27 AM roscogamer[m]: 🤔
08:27 AM roscogamer[m]: Hmm
08:27 AM skunkworks: onions have layers..
08:27 AM roscogamer[m]: Lemme take a look
08:27 AM jpa-: being able to stop X/Y/Z axis quickly when spindle faults for whatever reason is the difference between a broken tool and just a loud noise
08:30 AM roscogamer[m]: Nono he's got a point
08:37 AM roscogamer[m]: That convertor works with lcnc?
08:38 AM roscogamer[m]: If so imma pick up one of them
08:41 AM roscogamer[m]: Also if I want a touchscreen do I need to look for anything specific
08:48 AM roycroft: look for one that is supported by your operating system
08:58 AM Gamad8381[m]: i got an issue.. when spindle is ON and sometimes OFF spindle blink for 2-3sec ... any idea whats going on ?
08:58 AM Gamad8381[m]: but not everytime .. but mostly it does
09:13 AM pcw--home: skunkworks: yes
09:14 AM jpa-: Gamad8381[m]: what does that mean?
09:19 AM skunkworks: pcw--home: hi - stupid question. If I am running pwm out to run the servo - and the drive just passes the pwm to the servo. What loop is that concidered in linuxcnc
09:20 AM skunkworks: is it really just a current loop? or a voltage/current loop.
09:21 AM skunkworks: voltage loop? lol
09:21 AM pcw--home: depends on the drive, a bare Hbridge would be close to voltage mode
09:21 AM skunkworks: *velocity loop
09:21 AM Gamad8381[m]: oh eh lol 😄 my bad let me write one more time:
09:21 AM pcw--home: (and voltage mode is close to velocity mode)
09:21 AM Gamad8381[m]: i got an issue.. when spindle is ON and sometimes OFF Monitor blinks for 2-3sec ... any idea whats going on ?
09:21 AM Gamad8381[m]: but not everytime .. but mostly it does
09:22 AM skunkworks: pcw--home: https://www.a-m-c.com/wp-content/uploads/documents/AMC_Datasheet_BD15A8.pdf
09:22 AM pcw--home: EMI from drive
09:22 AM Gamad8381[m]: so blinks -> goes out black and back on .. everything else working fine meanwhile
09:22 AM skunkworks: pretty much just a bare h-bridge I think :)
09:22 AM jpa-: yeah, electrical noise from motor to monitor cable
09:22 AM jpa-: make sure all cables are shielded and the shields are grounded
09:23 AM skunkworks: pcw--home: it tunes suprisingly easy - both with mesa and just the printer port.
09:23 AM skunkworks: (or I am just getting better at it)
09:23 AM pcw--home: Yes it's "Direct PWM"
09:25 AM JT-Shop: make sure shields are grounded on one end only
09:26 AM skunkworks: pcw--home: once you get a stable PD ff1/2 tune - you can just throw I at it.
09:27 AM pcw--home: so basically a lousy velocity mode drive (but no local feedback so susceptible to supply voltage changes)
09:29 AM skunkworks: sure
09:30 AM skunkworks: Thanks!
09:30 AM pcw--home: If you can raise the servo thread frequency you can usually do better tuning wise
09:31 AM skunkworks: I upped it to 2khz and it helped
09:31 AM skunkworks: honestly though - it works suprisingly well.
09:32 AM skunkworks: The little pittman moter feels like a brick when you try to turn it.
09:32 AM pcw--home: We made Hbridge controllers for many years (mostly using SoftDMC) and we got really good results
09:33 AM skunkworks: I am using a laptop power supply to run it initally and I can trip the over-current in it.
09:33 AM pcw--home: (though SoftDMC has a up to 30 KHz "servo thread" )
09:34 AM roguish[m]: forecast going over 100 the next few days......
09:34 AM skunkworks: Lol - that is on thing people say - you need a control loop in the the mhz for anything to work well..
09:34 AM pcw--home: yeah we could usually get pretty much full performance (+- 1,2 encoder counts at peak motor current accels)
09:36 AM pcw--home: unless you are moving something very quick (say a piezo servo) a MHZ loop is silly
09:37 AM jpa-: even for on/off current regulation loop, 100 kHz is usually enough
09:39 AM pcw--home: Most drive PWMs are lower (20 to 50 KHz) due to switching losses
09:39 AM jpa-: yeah
09:39 AM pcw--home: and big stuff using IGBTs is often lower than that
09:40 AM skunkworks: https://www.youtube.com/watch?v=sUz5ZZyf2LU
09:40 AM pcw--home: SC MOSFETS are changing some of that
09:41 AM skunkworks: Ecoder count limited...
09:42 AM skunkworks: encoder
09:43 AM skunkworks: I also need to lower the voltage to the drives..
09:53 AM pcw--home: That's neat. Did you post that to the forum?
09:53 AM skunkworks: oh - linuxcnc forum. No.
09:53 AM skunkworks: I should :)
09:56 AM pcw--home: I don't see that there would be much difference (other than PWM/PDM resolution and encoder count rate)
09:57 AM skunkworks: I mean - it is totally usable as is..
09:58 AM skunkworks: certianly got a bit better tune with mesa. :)(
09:58 AM skunkworks: same 2khz
09:59 AM pcw--home: Right, so its great demonstration of LinuxCNC capabilities (you could use those Ebay/Chinese cheap Hbridges)
09:59 AM skunkworks: I have some new ball screws coming for it - a bit corser. (4mm vs 2.5) which will help the encoder counting a bit.
10:00 AM skunkworks: pcw--home: I was actually thinking of trying the l298n based ones you can get for <10 dollars
10:00 AM pcw--home: I think forum tommylight has done this (cheap Hbridge though not with parallel port I think)
10:01 AM skunkworks: pcw--home: also - the pci printer ports I have allow for x mode - which balances out the in/out pins better.
10:01 AM skunkworks: the pci-e ones I have do now.
10:01 AM skunkworks: not
10:08 AM perry_j1987: hmm well looks like i might be picking up a lms 3990 with dro and tooling for 1000 bucks
10:31 AM skunkworks: perry_j1987: seems like a good deal... :)
10:36 AM perry_j1987: ya hard to pass up
10:38 AM skunkworks: R8 - nice
10:41 AM skunkworks: pcw--home: do you know of a pwm+dir to +/-10v converter. (I will probably just make one with 2 op amps..)
10:41 AM skunkworks: for spindle control
10:45 AM pcw--home: Dont know off hand
10:46 AM skunkworks: ok.. seems like something that should exist.. ;)
10:47 AM skunkworks: On the other lathe I used a relay to switch between +/-.. Cludge..
10:47 AM pcw--home: I think I have PCB for one (never got around to producing it)
11:13 AM CaptHindsight[m]: skunkworks: https://www.axiomatic.com/converter.pdf
11:31 AM roguish[m]: a very simple drive. I use these for my brushed motors on an old PB Series II. https://www.cytron.io/p-20amp-6v-30v-dc-motor-driver
11:41 AM -!- #linuxcnc mode set to +v by ChanServ
11:49 AM skunkworks: CaptHindsight[m]: that seems expensive.. ;)
11:51 AM skunkworks: roguish[m]: do you know if they are opto-isoltated inputs?
11:51 AM pcw--home: I can send you a PCB
11:52 AM skunkworks: pcw--home: um.. Yes! are the parts available?
11:53 AM pcw--home: Just op amps and fairly generic OPTOs so yes probably
11:53 AM pcw--home: I didn't test its so it may have bugs however
11:54 AM skunkworks: pcw--home: I don't mind.
11:56 AM pcw--home: I have found that the low temp 138C SN/BI solder paste is very nice for SMT protos
11:57 AM pcw--home: no danger to connectors etc if you need to rework
12:01 PM cpresser: +1 for bismuth-solder. Thats awesome stuff. I solder all my stuff on a cooking-plate. The process-window is so big, its hard to make a mistake :)
12:03 PM CaptHindsight[m]: roguish: yes, page 1 of the data sheet
12:03 PM roguish[m]: skunkworks: I don't think so.... I use a 6i24 and then a 7i42 isolator.
12:03 PM CaptHindsight[m]: skunkworks: yes, build vs buy
12:04 PM CaptHindsight[m]: what is your time worth?
12:04 PM skunkworks: roguish[m]: ok - thanks - the l298 are not either.
12:04 PM skunkworks: CaptHindsight[m]: not much?
12:05 PM -!- #linuxcnc mode set to +v by ChanServ
12:06 PM CaptHindsight[m]: skunkworks: I saw a much cheaper non-isolated one but it was only 0-10V, you could add an opamp
12:06 PM jdh: seems like (without much thought) that pwm would be better suited for unipolar
12:06 PM CaptHindsight[m]: skunkworks: http://www.icstation.com/voltage-converter-module-adjustable-converter-power-module-digital-analog-signal-p-12498.html
12:07 PM skunkworks: CaptHindsight[m]: about $10k?
12:07 PM skunkworks: https://photos.app.goo.gl/M6CEUwRghkAwEvMu8
12:08 PM CaptHindsight[m]: skunkworks: how did it turn out?
12:08 PM skunkworks: https://photos.app.goo.gl/DfLcucyCbTCk6Tp16
12:08 PM skunkworks: only need a grill
12:08 PM skunkworks: still
12:09 PM skunkworks: been running awesome.. ave about 35mpg
12:11 PM JT-Shop: what is it?
12:11 PM skunkworks: 2017 volkswagen jetta.
12:11 PM JT-Shop: cool
12:11 PM skunkworks: got it for scap prince
12:11 PM skunkworks: price
12:11 PM skunkworks: have about 5k into it. very happy
12:12 PM JT-Shop: that's the one you had to replace some body parts?
12:12 PM skunkworks: ye
12:12 PM skunkworks: yes
12:12 PM CaptHindsight[m]: skunkworks: my neighbor got a diesel passat from an auction, they said it was similar damage to yours and supposedly runs.... it showed up with a cracked block
12:12 PM JT-Shop: I'm guessing a grill at a salvage yard is hard to find
12:13 PM CaptHindsight[m]: I think he is getting a used engine shipped from Germany
12:13 PM skunkworks: JT-Shop: you can get them off ebay (after market) for about $100 or so.. just have not pulled the trigger
12:13 PM CaptHindsight[m]: VW probably wants $500 for the grill
12:14 PM Rab: Looks like they're all over eBay, used OEM and aftermarket clone.
12:14 PM Rab: Cruise control distance sensor commands a premium.
12:15 PM skunkworks: CaptHindsight[m]: the one suprise was the plastic intake was cracked. I got one from germany (which includes the intercooler) ffor $300
12:16 PM skunkworks: I also got it in like 3 days. It was amazing.
12:16 PM CaptHindsight[m]: I have three cars to finish and I'm tired of cars again, one every ten years is plenty :)
12:16 PM skunkworks: CaptHindsight[m]: this replaces the 2006 jetta.. 260k miles - original clutch
12:17 PM skunkworks: *2006 corolla
12:18 PM CaptHindsight[m]: I had a diesel jetta back in the early 90's, I think it got close to 50mpg, it had trouble going uphill at 55mph
12:18 PM skunkworks: CaptHindsight[m]: we did too.. Don't remeber the year.. maybe 2000's?
12:19 PM CaptHindsight[m]: 5-speed manual
12:20 PM skunkworks: same
12:21 PM skunkworks: the 'new' jetta is 5 speed manual. It checked all the boxes..
12:21 PM skunkworks: manual, both keys, clear title..
12:21 PM skunkworks: Just needed a little buffing out
12:25 PM skunkworks: I did get a letter from the wi tax athourity.. You paid way less than the going rate for a 2017 jetta.. ($500)
12:26 PM skunkworks: The form had an email so I sent him a before picture explaining I bought it for the price of scrap. They emailed back and said - all good. Closing the audit.
12:27 PM JT-Shop: in Missouri you get a salvage title if you buy a wrecked vehicle
12:27 PM CaptHindsight[m]: skunkworks: no salvage title?
12:27 PM skunkworks: the title was clear. Don't know the story but I think daddy took care of it..
12:28 PM skunkworks: JT-Shop: The care was never 'totaled'
12:28 PM skunkworks: car
12:28 PM skunkworks: (normally the insurance company does it)
12:28 PM skunkworks: It suposidlty sat in someone's yard for 2 years.
12:29 PM skunkworks: 60k miles on it.
12:29 PM CaptHindsight[m]: that is odd since the insurance co would consider it totaled
12:29 PM skunkworks: CaptHindsight[m]: right - that is why I think it was swept under the rug...
12:29 PM CaptHindsight[m]: if you don't involve the insurance co and it's paid off
12:29 PM skunkworks: CaptHindsight[m]: right.
12:29 PM * JT-Shop has to learn how to convert ladder to C...
12:29 PM skunkworks: something happened..
12:29 PM roycroft: we don't have sales tax here, so the oregon department of revenue would never have any reason to send a letter like that
12:31 PM skunkworks: JT-Shop: seems like something that could be scripted.. Interesting..
12:32 PM JT-Shop: automation direct click plc's are out of stock until Jan
12:32 PM JT-Shop: they have https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/productivity_open_(arduino-compatible)#start=0
12:33 PM JT-Shop: in stock so have to use it
12:33 PM CaptHindsight[m]: I've been making lots of more of my own parts vs buying lately due to the shortages
12:33 PM skunkworks: our jetta diesel was 2001
12:40 PM CaptHindsight[m]: JT-Shop: C for those?
12:42 PM JT-Shop: it's arduino but they have code blocks that is visual
12:42 PM CaptHindsight[m]: huh https://www.automationdirect.com/open-source/programming
12:47 PM CaptHindsight[m]: you could swap controllers and have an whole IO system to work with
12:48 PM JT-Shop: hows that?
01:01 PM JT-Shop: now if I can get the printer connected back to the lan I'll be doing good
01:07 PM JT-Shop: hmm can't even get the laptop to connect to wlan
01:09 PM Tom_L: program it like a lego mindstorm :)
01:09 PM roycroft: https://www.youtube.com/watch?v=ckIMuvumYrg
01:12 PM JT-Shop: lol
01:25 PM roycroft: that was one of the better south park episodes ever
01:25 PM roycroft: it was themed after grapes of wrath
01:25 PM JT-Shop: laptop is connected so one down one to go
01:28 PM roycroft: i had a mail server die yesterday morning
01:28 PM roycroft: i knew it was going to die some day soon
01:29 PM roycroft: i had migrated about 90% of the customers off of it already, and was in the final stages of moving the rest
01:29 PM roycroft: now they don't migrate
01:29 PM roycroft: they get set up anew on the replacement server
01:29 PM roycroft: and i get to restore all their mail from backups
01:29 PM JT-Shop: fun
01:30 PM roycroft: 25 hours after the failure, i have all the customers set up on the new server, their inboxes restored, and their mail is flowing through the new server
01:31 PM roycroft: but it's going to take me several days to get all their other folders restored
01:31 PM roycroft: so yeah, my life is fun
01:31 PM roycroft: as well, it's elections time at the country fair
01:31 PM roycroft: and i depend heavily on our membership database to run the election
01:32 PM roycroft: i'm supposed be doing some final database tweaks this week, and start printing addresses on the ballot envelopes
01:32 PM roycroft: i have about 6000 to print in all
01:33 PM roycroft: but the web front end to the database is down, the person who maintains it is at burning man until some time late next week, and when contacted about it said "what's with all this asap urgency energy? i don't need that - you'll have to wait 'til i'm back"
01:33 PM roycroft: it would take him 30 seconds to fix the problem
01:34 PM roycroft: instead, i have to take a backup of the database, install it on a new server, audit it to see how many changes were made after the backup was taking (i think a couple hundred), and then manually reapply to those to the raw database
01:34 PM roycroft: i do not have a copy of the front-end software, so the only way i can manage it is via raw sql queries
01:35 PM roycroft: after i do all that, i'll still have a hundred or so updates to do, and then i can start exporting the data so that i can print the envelopes
01:35 PM roycroft: it's probably going to take me 15-20 hours to do all this
01:35 PM roycroft: when mr burning man could have spent the 30 seconds restarting the web server
01:36 PM roycroft: or he could have spent 10 minutes before heading off to the desert to write a script that would automatically restart the web server if it went offline (which it does frequently)
01:36 PM roycroft: so more fun for me
01:38 PM XXCoder: LOL roycroft literally day after I menion mtmwood, he uploads new video'
01:38 PM roycroft: you should have mentioned him earlier
01:38 PM roycroft: he was waiting for you
01:38 PM XXCoder: last video was 8 months ago
01:38 PM XXCoder: lol
01:39 PM XXCoder: its 30 second video
01:56 PM andypugh: mrec: Yes, it shoiuld be possible as long as the parallel port can keep up with the encoder.
01:56 PM XXCoder: yo
02:06 PM -!- #linuxcnc mode set to +v by ChanServ
02:06 PM -!- #linuxcnc mode set to +v by ChanServ
02:20 PM CaptHindsight[m]: my LPT encoders are counting at ~1ft/sec with 0.002" res
02:52 PM JT-Shop: finally figured out what was wrong with the printer connection
02:54 PM Connor1 is now known as Connor
02:54 PM XXCoder: whats happening with printer jt
02:57 PM JT-Shop: it had a funky ip address prob from when I plugged an ethernet cable in dunno
02:57 PM JT-Shop: could not see it on the network and that was the issue
02:58 PM XXCoder: interesting
03:09 PM * CaptHindsight[m] uploaded an image: (732KiB) < https://libera.ems.host/_matrix/media/r0/download/matrix.org/uAZBBtTEXxQkzVANVBIBbYVm/screen00.png >
03:10 PM CaptHindsight[m]: with a little RE, one could replace the duino micro with another of their choosing
03:10 PM CaptHindsight[m]: make use of the whole system their way
03:12 PM CaptHindsight[m]: https://docs.arduino.cc/hardware/mkr-zero the heart of the duino PLC
04:54 PM jepler1088[m]: https://github.com/piit79/Sub-Etha-Pad
04:54 PM jepler1088[m]: https://raw.githubusercontent.com/piit79/Sub-Etha-Pad/main/sub-etha-pad-m/Sub-Etha-Pad-M.jpg
04:59 PM JT-Shop: kinda neat but would be better with descriptions of the keys somehow
05:57 PM thorhian[m]1: Well, looks like I might be able to do a fixture job using FreeCAD lol.
05:58 PM * thorhian[m]1 uploaded an image: (303KiB) < https://libera.ems.host/_matrix/media/r0/download/matrix.org/jxVwiAdbbBgnegbSzDhuERrL/adaptive_fixture.png >
06:22 PM roycroft: does anyone use a product for flood/coolant systems that is similar to loc line but not loc line?
06:23 PM roguish[m]: roycroft: I think I have some cheap chinese knockoff. but don't remember exactly what is .............
06:24 PM roycroft: i like loc line
06:24 PM roycroft: and it's not as overpriced as some claim it is
06:24 PM roycroft: i just thought it worth a look if there are any alternatives that work well
06:25 PM roguish[m]: yeah, Amazonia has knockoffs..... search for 'coolant line'
06:27 PM roycroft: i am, as usual, looking for at least anecdotal reports from folks with whom i'm familiar and who actually use the alternatives
06:28 PM roycroft: people on the internet at large are about as trustworthy and believable as politicians
06:29 PM roguish[m]: if price doesn't matter, and isn't that big a deal anyway, get the loc-line. it's well proven
06:29 PM roguish[m]: mean....
06:29 PM roguish[m]: but true.
06:29 PM roycroft: i've used loc line on a number of things, and i've been very happy with it
06:30 PM roycroft: one of my best experiences with it is my brew system
06:30 PM XXCoder: roycroft: venera hose( cant spell it, looks like linked segements)
06:30 PM roycroft: if you're familiar with brewing, the starches in the grain need to be converted to sugars
06:30 PM XXCoder: but need pump and such
06:31 PM roycroft: that is done by circulating water through the mash at a temperature in the 60s (c)
06:31 PM XXCoder: interesting
06:31 PM roycroft: i have a setup that pumps the liquid up through a tube with a heating element inside it, and the liquid exits at the top
06:32 PM roycroft: it needs to be reintroduced into the mash very gently, so as not to stir things up and make it cloudy
06:32 PM roycroft: i put a ring of loc-line around the top of the mash tun - the kind with the nozzles in each segment
06:32 PM XXCoder: isnt it mainly wood you plan to use for cnc?
06:32 PM XXCoder: or is it something other than cnc its for?
06:33 PM roycroft: the cnc router will be primarily used for wood and plastics
06:33 PM XXCoder: plastics is fun when its termosplastic
06:33 PM roycroft: i *may* machine some non-ferrous metals upon occasion, that's not part of the plan
06:33 PM XXCoder: you'd want to do very good setup, and spray coolant like youre trying to drown plastic
06:34 PM XXCoder: if you want you can laugh at my bad fail on nylon milling
06:34 PM XXCoder: uploaded video of it years afo
06:35 PM roycroft: i actually need to take off right now
06:35 PM XXCoder: have fun
06:36 PM CaptHindsight[m]: went to three stores to get 2" dia casters, only the HF 2" casters are 2", Menards and HomeDepot are under by 0.050-0.10' in.
06:36 PM CaptHindsight[m]: lies!
06:40 PM CloudEvil: Being undersized by 0.050 to 0.10' for a 2" caster matters.
06:43 PM CaptHindsight[m]: and they weren't even metric 50mm!
06:45 PM CaptHindsight[m]: and of course HomeDepot was out of the lower cost casters
06:45 PM CaptHindsight[m]: my fake outrage will never end
06:48 PM CaptHindsight[m]: they probably make them undersize on purpose so that you have to buy 2 or 4 so the chairs or table don't rock
06:49 PM XXCoder: simpler reason: undersize = less plastic = less cost + millions made = lots money saved
07:06 PM Tom_L: always buy 3 legged tables
07:08 PM skunkworks: pcw--home: https://www.youtube.com/watch?v=VWXCAxUzXK0
07:09 PM Tom_L: skunkworks, what you been up to?
07:10 PM skunkworks: work kids family..
07:10 PM skunkworks: trying to get an emco lathe up and running for the basement tinker area. Have some ball screws coming for it.
07:11 PM Tom_L: nice
07:11 PM skunkworks: Tom_L: how about you?
07:11 PM Tom_L: did you finish that last lathe?
07:11 PM Tom_L: trying to get an rpi iso but not having much luck so far
07:11 PM skunkworks: the other emco? needs to be buttoned up.. but have been using it
07:12 PM skunkworks: yeck
07:12 PM Tom_L: it's close but so far away :)
07:12 PM skunkworks: lol.. I can imagine.
07:13 PM CaptHindsight[m]: and now the previously 2" in HF wheel is 1.966" after making it round and flat across its width
07:13 PM skunkworks: CaptHindsight[m]: what do you expect? ;)
07:13 PM Tom_L: why on earth would you want a round caster?
07:14 PM CaptHindsight[m]: it's a drive wheel now
07:14 PM skunkworks: Tom_L: I also get side tracked..
07:14 PM skunkworks: https://www.youtube.com/watch?v=cCxllDmiQEM
07:14 PM CaptHindsight[m]: 6.1764" circumference unloaded
07:15 PM Tom_L: cute
07:15 PM Tom_L: chainsaw grinder?
07:16 PM Tom_L: .. looks familiar
07:16 PM CaptHindsight[m]: skunkworks: 332.4852mm/sec for encoders read by LPT with 30uS base thread, 5x oversampled
07:16 PM CaptHindsight[m]: ~1ft/sec
07:21 PM skunkworks: CaptHindsight[m]: neat!
07:21 PM CaptHindsight[m]: +-25um
07:21 PM CaptHindsight[m]: 0.001"
07:21 PM skunkworks: Tom_L: it is a saw mill blade sharpener
07:23 PM skunkworks: the current input scale with the encoder/gearing and ball screw is 50800 counts per inch
07:23 PM CaptHindsight[m]: someone just asked the other day, "who still uses a LPT port?"
07:24 PM Tom_L: mine connects to the mesa via lpt
07:26 PM CaptHindsight[m]: 0.0039" steps per inch on this bar feeder
07:26 PM skunkworks: I am going from 2.5mm pitch to 4mm - which should lower the input scale.
07:26 PM CaptHindsight[m]: probably 10x better than it needs to be
07:27 PM skunkworks: to like 31,750
07:27 PM skunkworks: sure - but sure is easy to tune.. ;)
07:31 PM jdh: I have a lpt->7i43? somewhere, still packed
07:33 PM CaptHindsight[m]: I used up all my 7i43 years ago
07:34 PM Tom_L: jdh, i started with one of those
07:34 PM skunkworks: I started with a pluto..
07:34 PM Tom_L: switched to the 7i90
07:34 PM Tom_L: more ports and cheaper
07:45 PM Tom_L: skunkworks, how was that?
07:48 PM skunkworks: good learing experience.
07:48 PM skunkworks: got me a good idea how closed loop works..
07:48 PM Tom_L: was the driver harder to use?
07:49 PM skunkworks: No - but I don't think it was 100% but I don't really remember.
07:49 PM Tom_L: back then things were different..
07:49 PM skunkworks: yes
07:50 PM skunkworks: I was on the group buy for the 5i20's..
07:50 PM skunkworks: game changer.
07:50 PM Tom_L: was that peters's first board?
07:51 PM skunkworks: first one that had linuxcnc support (I think)
07:51 PM Tom_L: well that's what i meant
07:51 PM skunkworks: have 2 in the K&T
07:52 PM skunkworks: certainly do it different now - with smart serial and such. But buy - it just works..
07:52 PM skunkworks: boy
07:52 PM Tom_L: no config utilities back then was there?
07:52 PM skunkworks: No.. Still don't use them ;)
07:53 PM Tom_L: i never have
07:53 PM Tom_L: jt's looks pretty good though
07:53 PM skunkworks: I saw that. yes - anything to make it eaiser for beginers.
08:38 PM solarwind: Any tips on how I can demagnetize my bench vise?
08:38 PM solarwind: It's austempered ductile iron, so heating to critical point is not an option
08:39 PM XXCoder: I wonder if that tv degauss thing would work
08:41 PM Tom_L: https://www.hobby-machinist.com/threads/demagnetize-a-mill-vise.101065/
08:42 PM Tom_L: AC Stick welder
08:42 PM solarwind: oh that's perfect
08:42 PM solarwind: I have a spot welder, even better
08:43 PM solarwind: 1000A should be perfect
08:43 PM XXCoder: I still have tv degauss from my dad tv repair business era
08:56 PM CaptHindsight[m]: heat vise to Curie point
08:56 PM XXCoder: make sure nothing magnetic is near meanwhile
09:03 PM CaptHindsight[m]: https://www.mdpi.com/2075-4701/9/7/789/htm
10:29 PM XXCoder: insane
10:29 PM XXCoder: https://youtu.be/cobIQ437swo
10:29 PM XXCoder: 130w diode laser
10:34 PM Tom_L: https://www.amazon.com/Intel-i7-12700KF-Desktop-Processor-Unlocked/dp/B09FXKHN7M/ref=sr_1_1?c=ts&keywords=Computer+CPU+Processors&qid=1662003172&refinements=p_n_feature_four_browse-bin%3A2289792011&s=pc&sr=1-1&ts_id=229189
10:34 PM Tom_L: that's insane :)
10:34 PM XXCoder: jeez they are adversing input power, not output
10:34 PM XXCoder: its just 20w diode laser. still no enclosure ow
10:38 PM -!- #linuxcnc mode set to +v by ChanServ
11:27 PM mrec: XXCoder: isn't this an equivalent 130w diode laser?
11:27 PM mrec: XXCoder: for real it has much less power
11:27 PM XXCoder: its actually 20w
11:27 PM XXCoder: like I said earlier :)
11:28 PM mrec: Without a doubt, the Atomstack X20 Pro is now the most powerful diode laser engraver. It is equipped with a world's first quad-core laser module. Four 6W lasers are coupled into a 20W super laser, making the X20 Pro the absolute ruler in the field of engraving and cutting.
11:28 PM mrec: yes
11:28 PM mrec: 120w is just part of the product name
11:29 PM XXCoder: I think its semi-misleading
11:29 PM mrec: ok back to gear hobbing, did anyone do that? right now I don't know how to calculate the ratio between the spindle and the 4th axis
11:30 PM mrec: the encoder is quite cool, I just put a magnet on the tip of the spindle and fixed the AMS magnetic encoder PCB over it
11:43 PM mrec: andypugh: I just read your reply now, I chose the magnetic encoder because I can set up the resolution
11:44 PM mrec: andypugh: can you give me a hint about the calculation I just want to make some thin spur gears (0.8mm) m0.3 and some thicker m0.5 ones