#linuxcnc Logs

Oct 15 2023

01:40 AM Deejay: moin
04:49 AM JT-Cave: morning
06:03 AM Tom_L: morning
06:03 AM travis_farmer: Morning :-)
07:08 AM JT-Cave: rooster just crowed
08:02 AM JT-Cave: something odd is going on... I have my encoder scale at 8000 and counter-mode set to false but for 1" on the Axis dro it moves 1/4"
08:02 AM JT-Cave: the scale is copied from an older config...
09:04 AM JT-Cave: further investigation shows that the ini files had 8000 for scale but the hal file had 30000 hard coded for scale
09:04 AM travis_farmer: hate when that happens...
09:05 AM JT-Cave: just a matter of time before I finger out what the issue is/was
09:07 AM travis_farmer: hey, if i can figure out tool probing (though i had help), i have faith you will figure that out :-)
09:12 AM travis_farmer: 48F in my shop still... i really need to re-install the furnace out there...
09:36 AM Tom_L: 51F
10:04 AM JT-Cave: similar and raining
10:07 AM Tom_L: no rain here but we could use some
10:08 AM travis_farmer: father is watching youtube, mom's on tik-tok, and sister just entered a zoom meeting... so now my internet is lagging a bit... :-/
10:18 AM JT-Cave: mom's learning how to steal cars?
10:23 AM Tom_L: sis is learning how to drive them fast ?
10:24 AM Tom_L: so many terms we didn't have 10 yrs ago...
10:25 AM JT-Cave: I still play dumb if someone wants me to join a zoom meeting
10:26 AM Tom_L: just lets you sit around in your underwear and watch others do the same
10:27 AM Tom_L: they probably sell suits with no pants now too
10:46 AM * roycroft hates zoom meetings, but gets stuck participating in several/month
11:05 AM JT-Shop: nap time here
01:50 PM travis_farmer: maybe it is the quart of Mountain Dew soda i had this morning... but i am feeling very hopeful for the future of my machine right now :-D
02:25 PM CaptHindsight: https://www.reddit.com/r/BeAmazed/comments/178g2sp/the_precision_is_impressive/
02:45 PM JT-Shop: pcw--home, is pid.n.maxerror needed for anything? I see it in pnc...
04:40 PM JT-Shop: looks like it's only used for stepper systems...
05:03 PM pcw--home: pid.n.maxerror is useful for bounding bogus corrections in the stepgen position loop
05:03 PM pcw--home: caused by excess latency
05:03 PM JT-Shop: ok, thanks
05:04 PM JT-Shop: so not needed for a 7i77?
05:05 PM pcw--home: It's not normally used for systems with encoder feedback
05:05 PM JT-Shop: ok, thanks
05:07 PM pcw--home: (The stepgen feedback loop is "special" because its an almost perfect velocity mode servo so any major position errors are very likely to be bogus)
05:08 PM pcw--home: (so dont make thins worse by correcting for an error that's not real)
05:08 PM JT-Shop: that makes sense
05:11 PM pcw--home: so for example if a packet times out because of latency, the PID loop will use the previous cycles position feedback and make a large (bogus) velocity correction
05:12 PM pcw--home: (There are fancier way to fix this kind of error but maxerror can keep the corrections bounded)
05:15 PM JT-Shop: lost the hard drive on the BP so I'm making sure MesaCT can create a good configuration for a 7i77
05:30 PM pcw--home: That's a real test
05:31 PM JT-Shop: started out a bit rough but it's coming together
05:56 PM JT-Shop: say goodnight Gracie
06:02 PM Unterhaus__ is now known as Unterhausen
10:59 PM _unreal_: ve7it, looking for the link in the web site for the triple sea tel motor controller with the test code
11:00 PM _unreal_: the youtube video is there but cant find the link on the web site.
11:00 PM _unreal_: I'm asumming an old version of the HTML was reposted when your original web host shut down.
11:02 PM ve7it: looking.... not sure it was posted... let me check the hd
11:05 PM ve7it: https://ve7it.cowlug.org/seatel_uno_test.ino maybe?
11:06 PM ve7it: was on the website, but not linked to any page
11:15 PM _unreal_: oh
11:15 PM _unreal_: requested entry is too large
11:15 PM _unreal_: odd
11:16 PM _unreal_: lets see if the linux computer will let me download it
11:16 PM ve7it: download fine here with firefox and linux
11:17 PM ve7it: 4.6kb
11:18 PM _unreal_: conection refused
11:19 PM _unreal_: oh wait a sec
11:19 PM _unreal_: wifi was not connected to the right wifi source.
11:19 PM _unreal_: trying again
11:19 PM _unreal_: ok got it that time
11:20 PM ve7it: also try https://ve7it.cowlug.org/seatel_uno_test.pdf
11:21 PM _unreal_: strange microsoft edge wont pull the link
11:21 PM _unreal_: 404
11:21 PM ve7it: oops.... wrong link
11:21 PM _unreal_: big ass bird face LOL
11:22 PM ve7it: https://ve7it.cowlug.org/seatel_driver_uno_test.pdf
11:23 PM ve7it: show connections
11:25 PM _unreal_: sweet
11:25 PM _unreal_: been messing with chat GPT
11:25 PM _unreal_: for coding
11:25 PM _unreal_: and I was thinking HUMMM
11:26 PM _unreal_: I have a bunch of BLACK PILLs
11:26 PM _unreal_: stm32f4xxx
11:26 PM _unreal_: they can handle upto 4 quadrature inputs in hardware
11:26 PM ve7it: "dont take the RED pill!"
11:26 PM _unreal_: heh
11:27 PM _unreal_: ve7it, I just got a harbor freight, lathe, endmill, full height floor sanding drill press, oxy acet torch, and metal bandsaw and endless bits and adapters
11:27 PM _unreal_: $900 USD
11:28 PM ve7it: cool
11:28 PM _unreal_: and a craftsman bench/tool draw chest
11:28 PM _unreal_: CANT beat it
11:28 PM ve7it: new... used?
11:28 PM _unreal_: used
11:28 PM _unreal_: and other stuff
11:28 PM _unreal_: we estimated it to be valued between 8-12k
11:29 PM _unreal_: neighbor down the street from me passed away
11:29 PM ve7it: good find
11:30 PM _unreal_: ve7it, so do you have interest in any more of those bldc's?
11:31 PM _unreal_: I have enough to send you a set of ether one's with no encoders but have internal breaks. OR one's with internal encoders. or do you have any interest at all?
11:31 PM _unreal_: set of 3
11:32 PM ve7it: they are nice modern motors, not sure what I would build with them... I would love to build a small portable plasma cutter table... maybe 2'x3'
11:32 PM _unreal_: the bigger one's are rated for lower RPM
11:32 PM srk_ is now known as srk
11:34 PM ve7it: maybe more torque?
11:34 PM _unreal_: though the one's I sent you just need to be geared down considering they can do 2500 RPM.
11:34 PM _unreal_: I dont believe so
11:35 PM _unreal_: well nope same torque written right on them 22-OZ/IN
11:35 PM _unreal_: 800 RPM 22-oz/in,
11:35 PM _unreal_: the other one's that have the internal break but no encoder let me see
11:36 PM ve7it: I thought your supply dried up due to a dumpster diving ban at the tard
11:36 PM _unreal_: they are bigger
11:36 PM _unreal_: it did ISH
11:36 PM _unreal_: I just got permission to take 2 more that were being tossed
11:36 PM _unreal_: I got permission from the head of the marina
11:36 PM ve7it: nice
11:36 PM _unreal_: who imposed the rule
11:36 PM _unreal_: I special
11:36 PM ve7it: its stupid to waste the stuff
11:37 PM _unreal_: ya. the main reason(s) it happend and the reaction is even stupider
11:37 PM _unreal_: reaction=reason
11:38 PM _unreal_: I work for a company that resides in the marina, but marina employees themn selfs fucked it up
11:39 PM _unreal_: an expensive carbon boarding ladder was left by a boat. it was picked up and "tossed" by direction but rather then throw it away. the person tried to sell it. the boat found out about it and complained. well they left it and didnt lable it or anything just left it
11:39 PM _unreal_: for months
11:39 PM _unreal_: before it was thrown away
11:39 PM _unreal_: then about a month ago
11:40 PM ve7it: one more link https://ve7it.cowlug.org/seatel_driver.pdf schematic of the reverse engineered board
11:41 PM _unreal_: 3 huge marina props. like 3' diam. got tossed and they tried for 150' long luxury boats. and the marina staff tried to scrap it. few got fired. and thats when the entire dumpster policy happend not to long ago
11:41 PM _unreal_: fucking ass wholes
11:41 PM _unreal_: says wrong link
11:42 PM ve7it: https://ve7it.cowlug.org/seatel_driver.pdf works here
11:42 PM _unreal_: wtf microsft edge is having issues
11:42 PM _unreal_: chrome no issues
11:42 PM ve7it: surprised?
11:45 PM _unreal_: no
11:47 PM _unreal_: so ya the motors I sent you are more then powerful enough if if geard down.
11:47 PM _unreal_: 6:1 yields 9000-oz/in at 400 RPM
11:48 PM _unreal_: thats running at 2500 RPM
11:48 PM _unreal_: so add an encoder and loads of power.
11:49 PM _unreal_: .... I believe my math is right. its almost 1am
11:49 PM ve7it: 6*22 is 132 oz-in
11:49 PM _unreal_: err ya DUH
11:49 PM ve7it: 900oz-in would flip the table over!
11:50 PM ve7it: 9000
11:50 PM _unreal_: I timezed the RPM ratio 2500/6 = 400x 22 LOL
11:51 PM _unreal_: wasnt thinking
11:53 PM _unreal_: if doing a belt drive and a 10:1 reduction, 250 RPM, and 220-OZ/IN
11:53 PM _unreal_: still WAY fast for plasma cutter
11:55 PM ve7it: yup... just watched a video on youtube where a guy build a small plasma table from a laser engraver frame.... not ideal, but it kind of worked
11:57 PM _unreal_: ! thats not a bad idea
11:57 PM _unreal_: "small" but still
11:58 PM _unreal_: belt drive?
11:59 PM _unreal_: and plastic wheels as most laser etchers are?
11:59 PM ve7it: yes.... most stuff I cut would probably be < 1' square... mostly brackets