#linuxcnc Logs

Feb 24 2022

01:25 AM Deejay: moin
01:47 AM -!- #linuxcnc mode set to +v by ChanServ
01:47 AM randy: morning
01:47 AM CaptHindsight[m]: very early
01:47 AM CaptHindsight[m]: or late for me
04:45 AM * JT-Cave waits for the coffee pot to fire up
04:51 AM Tom_L: morning
05:00 AM Tom_L: mmm just started snowing again
05:00 AM JT-Cave: looks like we got about an inch of sleet
05:01 AM Tom_L: i don't think we're supposed to get much
05:03 AM Tom_L: odd, no clouds showing on the radar so it must not be much
07:04 AM JT-Cave: I need to find a cheap servo and drive for testing
07:05 AM Tom_L: i thought you'd found one
07:06 AM JT-Cave: I mean a real cheap one
07:07 AM JT-Cave: for an actual project the AD is pretty cost effective
07:07 AM JT-Cave: hmm, I need to look in my crap I might have one from some job
07:09 AM JT-Cave: lol amazon labels steppers as servos
09:03 AM unterhausen: I have some brushed dc with encoders I could send you, but I'm not sure about drives
09:26 AM -!- #linuxcnc mode set to +v by ChanServ
09:32 AM -!- #linuxcnc mode set to +v by ChanServ
09:32 AM -!- #linuxcnc mode set to +v by ChanServ
02:07 PM -!- #linuxcnc mode set to +v by ChanServ
02:07 PM -!- #linuxcnc mode set to +v by ChanServ
02:55 PM miss0r: CaptHindsight[m]: Are you around? I need your electronical insight
03:12 PM solarwind: miss0r try me
03:13 PM solarwind: I'm an EE
03:13 PM miss0r: You mind if we do this in PM, as it realy has nothing to do with linuxcnc?
03:13 PM solarwind: CaptHindsight[m] also, I use a MIG gun to feed wire for TIG welding. Convince me I'm wrong :P
03:13 PM solarwind: miss0r no problem, whatever you want
03:50 PM * roycroft wonders why rj-45 pinouts for rs-232 signals were never standardised
03:50 PM roycroft: i just had to make a cable to connect the serial ports on two odd devices
03:51 PM roycroft: the pinouts were: 3-5, 4-2+7, 6-4 for a simple connection with only xon-xoff for flow control
03:51 PM roycroft: one device did not have dcd or rts signals
04:26 PM -!- #linuxcnc mode set to +v by ChanServ
04:26 PM -!- #linuxcnc mode set to +v by ChanServ
04:38 PM solarwind: JT-Cave are steppers not technically servos?
04:38 PM solarwind: At least if they're closed loop?
04:43 PM JT-Shop: step drives usually don't take 0-10v analog signal...
04:43 PM JT-Shop: in any case I found a brand new servo and drive in my shop so I'm good to go
05:21 PM _unreal_: solarwind, servo generally referse to a FEED back looped motor
05:21 PM _unreal_: refers
05:22 PM _unreal_: solarwind, so servo as in RC toys, servo as in brushed or brushless motors with encoders
05:23 PM _unreal_: and yes even stepper motors unipolar, bipolar etc.. with encoders on them.
05:24 PM _unreal_: stepper motors with encoders are generally setup with whole, half. or micro stepping resolution to what ever the stepper motor has to begin with.
05:48 PM enleth: solarwind: just a spoolgun with no spool?
05:51 PM enleth: solarwind: as for steppers and servos, the most basic definition of a servo requires a feedback, so no, unless maybe you pair it up with a drive that is smart enough to use back-EMF and some advanced signal processing to provide actual feedback
05:53 PM enleth: but the other thing is, people expect and assume certain things when they hear "servo motor", and those things are implied when you buy a "servo motor", even though the motor itself, by itself, technically is not a servo yet until you pair it up with an encoder and a control system that can use it properly
05:53 PM CaptHindsight[m]: miss0r: if you're gone, try me early in your morning
05:53 PM enleth: or at least a tacho, if all you need is closed loop velocity control
05:54 PM enleth: or, again, a drive that does closed loop just by smart signal processing
05:56 PM enleth: heck, a hydraulic cylinder with some proportional valves and flow meters can be a servo if you provide it with all the high level logic to track position and detect end of travel based on measured volume of fluid entering and leaving the cylinder
06:01 PM _unreal_: ok etching/cutting out an other lable for work.
06:01 PM _unreal_: got to love OT working from home :)
06:02 PM _unreal_: between the last few things I made and and what I'm making right now. thats like 5 hours OT
06:02 PM _unreal_: :)
06:03 PM enleth: _unreal_: if that includes machine time, when you can actually do a little bit of something else, that's excellent
06:03 PM _unreal_: yes it does
06:03 PM _unreal_: I have to prove "screen shots" of my milling time at the start
06:03 PM _unreal_: they dont want to pay for my "small" fee for tool changes
06:04 PM _unreal_: I could swap a bigger "better" milling bit in to do the cut outs... most of the time. but they dont want to take the "risk" fee
06:04 PM _unreal_: I told them long time ago I have a risk fee. if it fucks up because I did a tool change sorry its on your nickel
06:04 PM enleth: sound like a great moment to tidy up, vacuum, sort stuff, etc. - you're still in there babysitting the machine, after all
06:05 PM _unreal_: have to
06:05 PM _unreal_: .5mm bits are stupid frail
06:05 PM _unreal_: I'm milling that... high density signage material
06:05 PM _unreal_: the stuff thats black in the middle and white on the out sides
06:06 PM _unreal_: making replacement little milled signs that the boat had originally but got fire damaged
06:07 PM _unreal_: ac light switch, dc light switch, fuel selector..... all kinds of stuff
06:10 PM _unreal_: ve7it, at some point in time we will have to but heads over the servo controllers again. not sure when but... I think they are "talking" to each other some kind of noise? I'm wondering if it needs filter caps on the power
06:12 PM _unreal_: t4nk_freenode, speak... whats new
06:27 PM CaptHindsight[m]: solarwind: you're not a real welder until you use micrometers as welding clamps :)
06:57 PM infornography: look how cheap these stainless jacobs chucks are
06:57 PM infornography: https://www.ebay.com/itm/334206796772
06:58 PM infornography: use k1m chuck keys apparently
06:58 PM infornography: I'm gonna try one
06:59 PM roycroft: but are they genuine jacobs chucks or fake jacobs chucks?
06:59 PM roycroft: if the latter, they're an even better deal, because you'll get free crunchiness thrown in with the chuck
06:59 PM roycroft: bonus swarf, as it were
07:01 PM infornography: at that price something has to be wrong
07:01 PM infornography: we will see
07:05 PM roycroft: how does it mount?
07:05 PM XXCoder: roy it should have bolt hole in back
07:05 PM roycroft: maybe it's some oddball thread or taper and you'll have to turn an arbor or thread for it
07:05 PM XXCoder: you can screw it into jacobs taper or whatever need to
07:06 PM XXCoder: good question on thread sie
07:06 PM roycroft: sure, but is it m8.7 with a 1.59 thread pitch?
07:06 PM infornography: its #1 taper mount
07:06 PM roycroft: the listing says "medical" and that usualy translates to "weird and expensive"
07:07 PM roycroft: #1 what?
07:07 PM infornography: 1 jacobs taper
07:07 PM roycroft: morris? b&s? uncle joe's?
07:07 PM infornography: jt1
07:08 PM infornography: I found keys, they are also stainless
07:09 PM infornography: part number 33338 is still listed on the jacobs website
07:09 PM roycroft: the chucks are cheap, but i really don't need a chuck that size
07:10 PM XXCoder: you could use it as part of fixture for cnc cutting a round part, pointing up
07:10 PM roycroft: i should probably buy up as many as i can get, wait 'til that guy sells out, and the flip them for 2x as much as i paid
07:13 PM infornography: Maybe if the one seems ok, I'll buy some more
07:16 PM roycroft: i think i'll go work on my 3d printer for a bit - now that i have a proper crimp tool i should be able to terminate the cables for the new hot end properly
07:18 PM XXCoder: :)
08:11 PM forsytjr: Is there anyone that sells computers with a parallel port that is known to work well with Linuxcnc. Using a gecko 540 if that’s important.
08:13 PM jdh: there are pci-e p-port cards that work
08:28 PM t4nk_freenode: _unreal_, SPEAK I sayeth unto thee!
09:01 PM roycroft: instead of computer + parallel port card + bob i'd think about rpi4 + mesa ethernet board
09:02 PM roycroft: whever rpi4s and mesa ethernet cards are available again
09:04 PM _unreal_: well that was delayed
09:11 PM roycroft: my printer thinks the hot end temperature is 98 degrees when the heater has not been plugged in
09:11 PM roycroft: i had read that the thermistors that ship with the volcano kit don't always work right
09:14 PM flyback: https://www.youtube.com/watch?v=1GG1RC7GV0Y
09:14 PM XXCoder: saw that video, its quite funny