#linuxcnc Logs

Nov 24 2021

#linuxcnc Calendar

12:11 AM Centurion_Dan1 is now known as Centurion_Dan
01:03 AM Centurion_Dan1 is now known as Centurion_Dan
01:14 AM randy: morning
02:27 AM captain_morgan2 is now known as captain_morgan
05:23 AM JT-Cave: morning
08:00 AM Tom_L: morning
08:29 AM Loetmichel: *MUHAHA* co-worker just gave me a bit of sage advice: "You know that situation when you wake up after a night out in a foreign bed, look to the side and think 'MAN was i drunk last night!'?" $me:"yep, vagueley." Him: "Whatever you do, NEVER say that aloud!".
10:08 AM CloudEvil: Loetmichel: was that advice as you were lying next to them?
10:59 AM roycroft: i get off work at noon today
11:00 AM roycroft: so i'll be able to avoid the peak of the thanksgiving grocery shoppping mêlée
11:00 AM roycroft: it will just be 3x as crazy as normal instead of 10x as crazy
11:06 AM unterhausen: Went shopping yesterday. Now I just have to figure out how to get the turkey in the instant pot
11:10 AM aaroncnc: unterhausen, do you have a hydraulic press?
11:27 AM -!- #linuxcnc mode set to +v by ChanServ
11:27 AM -!- #linuxcnc mode set to +v by ChanServ
11:31 AM captain_morgan2 is now known as captain_morgan
11:58 AM unterhausen: It looks like the hydraulic press channel has never done a turkey
11:59 AM aaroncnc: unterhausen, seems you need to do us a science and find out what happens.
12:04 PM roycroft: is the turkey still frozen?
12:04 PM roycroft: that would make a difference in the specfication of the hydraulic press
12:04 PM roycroft: i should think a frozen turkey would require a much larger press than a thawed one
12:07 PM Tom_L: you might come up short if you haven't done your shopping yet
12:09 PM aaroncnc: yea, shopping this year has been a pain, i only go to the store after they get most of their trucks. if you go about 2 days later the shelves are very picked over.
12:10 PM aaroncnc: Also the amount of pasta and beans i have eaten this year is about 4X what i used to eat. but to be honest mostly a good thing.
12:10 PM Centurion_Dan1 is now known as Centurion_Dan
12:20 PM roycroft: i've cut way down on pasta this year
12:22 PM unterhausen: I have a fatigue machine that will crush a turkey. Worked on my hand anyway
01:29 PM unterhausen: a former student asked me to be a reference. I have to fill out an anonymous survey. I wonder if they care if I give all max rating
01:31 PM pere_ is now known as pere
02:02 PM CaptHindsight[m]: unterhausen: as long as its more positive than negative
02:31 PM unterhausen: I want to game it to be as positive as possible
02:36 PM CaptHindsight[m]: experts have told be to have a few responses just under 100%
02:36 PM CaptHindsight[m]: be/me
02:36 PM CaptHindsight[m]: adds credibility
02:40 PM CaptHindsight[m]: took me an hour yesterday to try to install FreeDOS on an old PC to run some Yaskawa servo controller config software on an old drive
02:40 PM unterhausen: that's what I was wondering
02:40 PM unterhausen: where did you get the yaskawa software?
02:40 PM CaptHindsight[m]: serial port only
02:41 PM CaptHindsight[m]: the old DOS versions were found 4-5 years ago on various links on CNC forums and similar
02:41 PM CaptHindsight[m]: I'm glad I saved them since I could access the old links anymore
02:41 PM unterhausen: win10 32 bit will run dos software
02:41 PM CaptHindsight[m]: do you need copies?
02:42 PM unterhausen: I gave up on my drives, but I didn't throw them away. So the software would be nice
02:42 PM CaptHindsight[m]: I have win7 on a PC that never gets network access with tons of CAD on it
02:43 PM CaptHindsight[m]: the new Yaskawa softwre is USB only
02:43 PM unterhausen: I don't think I can install win7 now.
02:43 PM unterhausen: win10 is still free for a little while longer
02:47 PM unterhausen: I thought about writing an app for some of my drives, they kindly published the protocol
02:47 PM unterhausen: or you can buy their software from AB for $2000
02:48 PM unterhausen: used to be free, but AB got tired of that
02:56 PM CaptHindsight[m]: I think the Parker software to config drives is still free
02:56 PM CaptHindsight[m]: you just need their cable, USB to RJ12 or 45
02:57 PM CaptHindsight[m]: or make one
02:57 PM CaptHindsight[m]: USB to serial
03:08 PM CaptHindsight[m]: unterhausen: let me know if you get them to work, i haven't been able to get a connection yet
03:09 PM CaptHindsight[m]: I have an old SGDA analog drive stuck in some torque mode
03:10 PM CaptHindsight[m]: varying the +-10V just locks the motor, the higher the voltage the stiffer it gets
03:10 PM CaptHindsight[m]: it might have been used as a brake or load
03:11 PM CaptHindsight[m]: the other option is buying the keypad programmer used on ebay for $100 and up
04:03 PM Loetmichel_: CloudEvil: the coworker is male, i am straight. So no. Considering that he looked a bit worse for wear i am inclined to heed his warning though.
04:04 PM XXCoder: lol
04:10 PM miss0r: CaptHindsight[m]: the project is slowly comming along: https://photos.app.goo.gl/7S7VEudfzn7yTwz37
04:10 PM XXCoder: rail gun? heh
04:11 PM miss0r: coilgun, actualy. I made one EAONS ago.. now I've decided to revisit the subject, with a machineshop at my disposal
04:12 PM Loetmichel_: XXCoder: looks more like a coilgun
04:12 PM XXCoder: interesting
04:12 PM Loetmichel_: ah!, got it right
04:12 PM CaptHindsight[m]: heading out before dark again, last sun i saw was Sunday
04:12 PM miss0r: That is just a proto-type "bench style" setup, not ment to be anything but a variable platform where I can move stuff around and test it bit by bit
04:13 PM miss0r: hence the long top with two parallel t-slots
04:13 PM Loetmichel_: miss0r: good idea. Took me ages to find the right timing for the coils in mine
04:13 PM Loetmichel_: ist also heavily dependand on the mass and material of the projectile
04:14 PM Loetmichel_: ... just to warn you ;)
04:14 PM miss0r: Loetmichel_: Indeed. I'm also going to add a dual 555 circuit to drive the two last coils (out of three). one to adjust the delay and one to adjust the pulsewidth
04:14 PM miss0r: Indeed. I've already collected alot of data on that, with just one coil
04:14 PM miss0r: I found that I could get the best effeciency with a ferrite rod, 12mm longer than the coul
04:15 PM miss0r: coil*
04:15 PM miss0r: Loetmichel_: The coilgun I build back in the day had a pretty substantial cap bank. IIRC it had 20 or so 200volt caps (maybe 2200uF each) connected in parallel.
04:16 PM miss0r: But I remembered my main issue from back then - the lack of projectile stability. So this one is based on the small 10k rpm motor spinning the projectile priot to launch - and I will see where that leads me :)
04:19 PM Loetmichel_: i used broken 1/8" tungsten carbide bits as projectiles (the "glue" is cobalt which is ferromagnetic)... the form makes them pretty stable, a bit like an arrow but yeah, i noticed that, too
04:21 PM miss0r: This one is sporting 7.8mm projectiles. (I'm using 12mmOD/8mmID acrylic tube to wind the coils on)
04:21 PM miss0r: Then I can make a bunch of different winding counts and different gauges to do so, and see what gives me the best results. Another reason for the bench setup
04:53 PM * JT-Shop looks around the shop for a building stretcher... and on the internet for a smoked brined turkey breast recipe
05:42 PM srk_ is now known as srk
06:20 PM roycroft: my bandsaw stand is glued up now
06:21 PM roycroft: and it was a pretty hairy glue-up
06:21 PM roycroft: i'm glad it's not the middle of summer - i'd not have had time to complete it with titebond ii
06:21 PM roycroft: and i did not want to mix up epoxy for this
06:22 PM roycroft: i can sand, fillet, and prime the outside of the stand tomorrow, and put color on it friday
06:23 PM roycroft: sunday would be pushing it for installing the saw on the stand, but i might go for it
06:29 PM CloudEvil: :)
06:31 PM t4nk_freenode: heh, I glued some wood together too, last night. I don't think of those things normally, but it's pretty strong and it saves me some nuts&bolts
06:32 PM roycroft: in the summertime i have about 10 minutes open time on a glue-up
06:32 PM roycroft: it took me about 25 minutes to do this one
06:32 PM roycroft: and that is after i had all the clamps laid out, all the pieces laid out, and having done a dry run to get the sequence worked out
06:34 PM roycroft: by the time i was done, it was getting pretty hard to suck the last pieces together
06:34 PM roycroft: but it's done, and it's solid
09:49 PM CaptHindsight[m]: https://i.imgur.com/kXfWYsx.jpg not sure where or when I got this....
09:49 PM CaptHindsight[m]: but the bearings don't sound the greatest under no load
09:50 PM XXCoder: is it rebuildable?
09:50 PM CaptHindsight[m]: is it worth it?
09:51 PM CaptHindsight[m]: it's been in a box for years, never run until today
09:51 PM _unreal_: CaptHindsight[m], prob the lower bearings right?
09:51 PM _unreal_: I had to change the bearings on mine more or less the same model
09:51 PM roycroft: almost anything is rebuildable
09:52 PM XXCoder: you got plans for it?
09:53 PM _unreal_: CaptHindsight[m], those spindles have one big bearing at the top and the bottom
09:53 PM _unreal_: VERY easy to change
09:54 PM _unreal_: the end cap just pulls off
09:55 PM CaptHindsight[m]: miniature cheese sculptures
09:55 PM _unreal_: ?
09:55 PM XXCoder: high end
09:55 PM XXCoder: of course you need 5 axis
10:00 PM CaptHindsight[m]: and HAH hah at the 400w rating
10:01 PM XXCoder: my cnc router uses exact same spindle
10:01 PM XXCoder: its fine for simple stuff like wood
10:01 PM XXCoder: some plastics, though careful with termosplastics
10:03 PM CaptHindsight[m]: here is a 350W spindle next to a 400 Chinese Watt spindle :) https://i.imgur.com/Vo7s0Et.jpg
10:03 PM XXCoder: lol
10:03 PM XXCoder: maybe you can use it as perfect round only 4th axis
10:03 PM XXCoder: mount it on side and have mill shape it
10:04 PM XXCoder: it just spins so of course its only round features lol
10:05 PM roycroft: i have a spare 80mm spindle, but it is missing some of the blue smoke
10:05 PM roycroft: that's one thing that would be hard to repair
10:05 PM _unreal_: so thats where that blue smoke came from
10:19 PM _unreal_: CaptHindsight[m], so plans for that spindle?
10:29 PM CaptHindsight[m]: I have some 2-3Hp spindle motors around here
10:29 PM CaptHindsight[m]: trying to sort out lots of old but fine things
10:29 PM CaptHindsight[m]: lots of DC servos
10:31 PM CaptHindsight[m]: they would be 10 Chinese HP
10:32 PM _unreal_: I have a 40 amp DC spindle motor controller
10:32 PM CaptHindsight[m]: the 400W spindle might be 100W max
10:32 PM _unreal_: 100v 40 amp if mem serves with many ctrl features
10:32 PM CaptHindsight[m]: it runs better without the PWM speed controller
10:33 PM CaptHindsight[m]: I bet the PWM is like 90% max duty
10:33 PM XXCoder: i noticed that it loses a LOT of torque when less than max
10:33 PM XXCoder: that was why i was adding cheap encoder, so it can ramp up power when rpm is lowered with pid
10:34 PM CaptHindsight[m]: i can easily stop it with my hand at <50% speed
10:34 PM CaptHindsight[m]: oh i have a never used AC router motor
10:35 PM _unreal_: CaptHindsight[m], if you have any intrest in that contoller of mine I'm always looking to sell....
10:35 PM _unreal_: dont know its model off the top of my head
10:37 PM CaptHindsight[m]: it's 4x the size of the 400W spindle
10:37 PM CaptHindsight[m]: and only 320W
10:38 PM _unreal_: kbbc-24m (9500f)
10:39 PM CaptHindsight[m]: the 6K rpm AC servos rated for 250W are 2x the size as well
10:39 PM CaptHindsight[m]: 360V with exotic magnets
10:45 PM _unreal_: CaptHindsight[m], I'm just not sure what I would ever do with that motor controller
10:45 PM _unreal_: I just dont have a spindle that needs it. and its DC not BLDC