#linuxcnc Logs

May 04 2020

#linuxcnc Calendar

02:11 AM Loetmichel: mornin'
02:17 AM sensille: Loetmichel: you know that lathe by any chance? https://www.ebay.de/itm/362978413480
02:17 AM Loetmichel: *harhar* coworker just: "hey, whats the weight of that 42" monitor shipping crate?" $me: "hmm, about 30kg?" Coworker plaves the box on the scale: 65kg... her:"The only thing Loetmichel cant do: approximating weight. Always at least a third low!" ;)
04:22 AM Loetmichel: hehe, just have sheet alu on all the 5 3d-printers here. coworker has painted the engravings in the 3mm alu plates black... now the paint has to dry before sanding the the excess off... what better way than 70°C heated beds? ;)
04:49 AM jthornton: morning
04:49 AM XXCoder: yo
05:26 AM Deejay: hi
05:32 AM JT-Cave: morning
05:53 AM Tom_L: morning
05:53 AM XXCoder: heys
05:54 AM JT-Cave: had a storm pass over yesterday about 1 PM dumped 1" of rain in a few minutes then lost power till 6 PM
06:02 AM Tom_L: we caught the edge of one but didn't get much
06:04 AM Tom_L: power loss screw up your chicken timer?
06:08 AM JT-Cave: I fired up the big generator so the chicks would have heat
06:58 AM pink_vampire: why there is weight inside pressure switch in my air compressor that prevent you from power it off before it build some pressure??
06:59 AM pink_vampire: the*
07:02 AM SpeedEvil: Are you sure it's not so that it stays on when powered off, till it drops pressure and vents the tank
07:02 AM SpeedEvil: - can help with moisutre
08:36 AM skunkworks: pcw_home: how accurate does it seem to be?
09:01 AM pcw_home: The Galvanometer? I have no real way to test yet but claimed linearity is 0.1%
09:22 AM skunkworks: pcw_home: link?
09:24 AM pcw_home: https://www.aliexpress.com/i/4000557654102.html
11:56 AM lecki85: Hello, I have a problem with the joint_following error. Distance and direction on the screen is right, so the impulses per rev shuld be right.
11:56 AM lecki85: It works when ich use low speed. At higher speed the failure occurs.
11:57 AM gloops: acceleration?
11:58 AM lecki85: I use mesa 7i77 with sew mdx61b servo drives. From the included sew der11b card which makes 1024 Pulses per Rev.
11:59 AM lecki85: I have played with, bud with no success. From 750 to 50 the same problem.
12:00 PM lecki85: The servo has a reduction gear i = 7 and the spindle has 4mm/rev.
12:01 PM lecki85: Max Rev of the servo is 45001/s
12:25 PM dirty_d: lecki85, look at hal scope
12:25 PM dirty_d: look for joint.0.f-error or something
12:25 PM dirty_d: compare it to joint.0.cmd-pos
12:25 PM dirty_d: not sure if those are the exact names, but close
12:25 PM dirty_d: you might have to tune the PID
12:25 PM lecki85: I did, like talla83 showed it in his video.
12:26 PM dirty_d: what did it look like?
12:26 PM lecki85: I see the same waveform as joint pos cmd a bit later as f-error of the axis.
12:27 PM dirty_d: the error doesn't decrease if you stop moving?
12:28 PM lecki85: at the end of the move the error is almost zero
12:29 PM pcw_home: are these velocity mode servos?
12:29 PM lecki85: i increased p til the axis oscillates
12:30 PM lecki85: i hope i use velocity mode. i will check this tomorow
12:31 PM pcw_home: Velocty mode tuning is 99% getting FF1 set properly
12:33 PM lecki85: Thank you i will play with FF1 tomorrow.
12:53 PM Loetmichel: any offroaders here? suggestions for a cheap but useable sidebyside with roof and windshield to search for in german used markets?
01:03 PM FinboySlick: Loetmichel: Is can-am on the german market? The 'Defender' might be along your needs. Not sure on the windshield options though.
01:05 PM rmu|w: Loetmichel: you will need something like this: https://www.x-ant.at/
01:05 PM Loetmichel: why?
01:06 PM rmu|w: for convenience
01:06 PM Loetmichel: FinboySlick: new: yes. used: nada
01:06 PM Loetmichel: but thanks
01:07 PM Loetmichel: rmu|w: i want a "car" that can move me to work and back reasonably "rain free" and dont cost much and if it can do offroad: all the better
01:07 PM Loetmichel: also if its lightweight and doesent need much power its easier to convert it to EV
01:08 PM Loetmichel: hence a sidebyside with roof and windshield because it can do all that
01:09 PM FinboySlick: Loetmichel: It's legal to drive side-by-side on the road where you are? Or do you have an offroad path to work?
01:09 PM Loetmichel: both
01:10 PM Loetmichel: you have to get a license but yes, they are legal on the road
01:10 PM Loetmichel: s/license/regristration
01:10 PM Loetmichel: like a car has to have
01:10 PM FinboySlick: Interesting. Can't drive 'em on the road here.
01:11 PM Loetmichel: in fact its a "Light vehicle" as much as german SMV is concerned
01:11 PM Loetmichel: and of course have to have lights and blinkers and all that stuff
01:11 PM Loetmichel: DMV
01:13 PM Loetmichel: FinboySlick: "here" is where? USA?
01:13 PM FinboySlick: Canada
01:13 PM Loetmichel: ah
01:14 PM Loetmichel: close
01:14 PM Loetmichel: _)
01:14 PM Loetmichel: :-)
01:14 PM FinboySlick: Different brand of idiot head-of-state ;)
01:14 PM gregcnc: lol
01:15 PM Loetmichel: FinboySlick: in germany those kinds of vehicles (even "regular" quads) can get a "LOF Registration" (Land-oder Forstwirtschaftliche Zulassung)
01:16 PM Loetmichel: meanin its a machine for farm and forest service and has reduced tax
01:16 PM Loetmichel: which makes it PRETTY cheap to drive on german streets with it, considering that they usually dont need much fuel either
01:16 PM gregcnc: can be legally driven anywhere?
01:16 PM Loetmichel: yes
01:20 PM Loetmichel: also german vehicle tax is per 100ccm of displacement so a smaller engine means also less tax
01:20 PM gregcnc: do you have to have a farm?
01:21 PM Loetmichel: nope
01:22 PM Loetmichel: dont need to. the registration doesent require you to have one
01:22 PM gregcnc: how many people actually do this?
01:22 PM gregcnc: other than farmers
01:22 PM CaptHindsight: Loetmichel: how are the laws there about EV conversions?
01:22 PM Loetmichel: i would guess that about 80% of the quads in germany have a LOF registration
01:22 PM Loetmichel: CaptHindsight: very strict
01:23 PM Loetmichel: you need a full vehicle EMI test AND a certificate for every part you use
01:23 PM Loetmichel: and then the TÜV still says "dont like it" and you will pay thru your nose
01:24 PM gregcnc: few EV conversion then?
01:24 PM Loetmichel: (i have an off the record statement from a TÜV engineer here in the state of hessen: "Dont do it. we have order from high up to send you away as often as needed until you have no money left. go to bavaria, its easier there"
01:24 PM Loetmichel: TÜV is the organisation that does the Roadworthy check every two years.
01:24 PM gregcnc: it's not like there are many in the US, but other than a few states prettymuch anything goes
01:25 PM Loetmichel: depending on state, as i mentioned above
01:26 PM gregcnc: only a couple have a real inspection. and a few have emissions, I don't know how that's handled
01:27 PM Loetmichel: gregcnc: german highways have no speedlimit whatsoever on about half the network. you DONT want rust buckets on those.
01:28 PM Loetmichel: so inspection is really thourough here
01:28 PM Loetmichel: maan my spelling sucks
01:28 PM gregcnc: yes i know, and a driver's license is a serious thing here they hand them out like candy
01:31 PM gregcnc: making holes in wiper felt material: sharpened tube?
01:31 PM CaptHindsight: like a leather punch
01:31 PM Loetmichel: gregcnc: a drivers license in germany takes about half a year, a dozen theory lessons a 45min each, a theory exam, about 20 "hours" of driving with an instructor in a special car, a practical test, an eye exam, an 8 hour first aid course is also mandatory and costs about 2000 eur
01:32 PM Loetmichel: and then its only for up to 3,5 metric ton vehicles with 4 wheels
01:32 PM Loetmichel: and motorbikes up to 50ccm
01:32 PM CaptHindsight: Loetmichel: here you just can't make a serious mistake, "moving violation" on your test
01:33 PM Loetmichel: ah, yes, and you have to get it perfect or you fail the test
01:33 PM Loetmichel: not a single error on the driving test ;)
01:33 PM gregcnc: here you worry less about the jalopies on the road than the drivers
01:33 PM Loetmichel: jalopies?
01:33 PM gregcnc: piles of shit with wheels
01:33 PM CaptHindsight: gas was down to $1.29/gal here
01:33 PM Loetmichel: ah, rust buckets
01:34 PM CaptHindsight: paid $1.48/gal Saturday
01:34 PM * Loetmichel just filled his BMW up a couple hours ago: 1.09 eur per liter
01:34 PM Loetmichel: and thats about 2/3 of what it was before corona hit.
01:34 PM gregcnc: rust is normal, but cars literally falling apart
01:35 PM Loetmichel: CaptHindsight: thats about 3 times your fuel price
01:35 PM CaptHindsight: https://i.pinimg.com/originals/3a/15/71/3a1571c8b8a33af9ba82101a03dd9ef0.jpg
01:35 PM CaptHindsight: compare to Chine
01:35 PM gregcnc: yeah or that
01:36 PM Loetmichel: gregcnc: normal? over here if you have rust on any "load bearing" part you will fail TÜV
01:36 PM Loetmichel: that includes the running boards
01:37 PM gregcnc: here if you have a title, you can register
01:37 PM gregcnc: though you will need to pas emissions in IL
01:37 PM Loetmichel: here you have to have a clean and recent "TÜV" as well to register a car
01:38 PM Loetmichel: AND an insurance number for said car
01:38 PM Loetmichel: or you wont get the license plates
01:39 PM CaptHindsight: Loetmichel: here they just want you to drive and burn gas
01:39 PM CaptHindsight: and they test emissions on cars made after 95 in many cities
01:39 PM CaptHindsight: thats about it
01:40 PM Loetmichel: http://www.cyrom.org/palbum/main.php?g2_itemId=12340&g2_imageViewsIndex=1 <- thats what a german "title" looks like btw
01:41 PM gregcnc: turning crappy cars into crappier cars is a hobby here
01:42 PM CaptHindsight: pretty sure if you attach a large rear spoiler the car goes 2x the speed
01:42 PM CaptHindsight: and bigger tires
01:43 PM Loetmichel: harhar
01:43 PM Loetmichel: when i look at the few americans i had the "pleasure" to drive over german autobahns: better that they dont drive fast.
01:44 PM Loetmichel: i was considering getting a water resistant seat liner ;)
01:45 PM Loetmichel: at 230kph in moderate traffic they all looked like they will pee themselves soon ;)
01:45 PM Loetmichel: btw: 230kph is just about 140mph. not THAT much
01:47 PM gregcnc: my buddy took me for a ride on a gsxr around town up to 140MPH it was unsettling. Though t's probably a good thing i didn't get into motorcycles
01:48 PM Loetmichel: yeah, motorcycle is a bit different
01:48 PM CaptHindsight: Loetmichel: not many places to practise here, no Nürburgring here
01:49 PM Loetmichel: but i drive a 19 year old BMW 525i touring
01:50 PM Loetmichel: CaptHindsight:i am aware of that
01:51 PM Loetmichel: and i was only once on the nürnburgring so far
01:52 PM Loetmichel: funny but not comparable to driving on the autobahn
01:52 PM Loetmichel: ... a LOT less idiot that pull out behind a truck without looking in the rearview mirror
01:53 PM Loetmichel: +s
01:53 PM CaptHindsight: Loetmichel: they can't even handle a buggy here https://www.nytimes.com/2020/05/04/us/bath-county-amish-buggy-accident.html
01:56 PM Loetmichel: maybe the horse wa water-shy?
01:56 PM Loetmichel: was
01:57 PM XXCoder: wonderful. wa state got some murder wasps
02:03 PM sensille: are there any affordable mini lathes that are particularly recommendable?
02:04 PM CaptHindsight: sensille: do you feel up to rebuilding a new one?
02:04 PM Loetmichel: sensille: i would say the link you gave me (sieg C2) is about as good as it gets "bang for the buck" wise
02:05 PM CaptHindsight: HF lathe just needs to be rebuilt when you open the box
02:05 PM Loetmichel: CaptHindsight: s/rebuilt/recalibnrated
02:05 PM Loetmichel: -n
02:06 PM Loetmichel: they are usually not THAT well adjusted
02:10 PM sensille: CaptHindsight: rebuilt as in? change the bearings? or even more?
02:12 PM CaptHindsight: bearings and more
02:12 PM CaptHindsight: square it up, drill oil holes ALL the way through etc
02:15 PM sensille: CaptHindsight: on my own i wouldn't know what to do, but i guess there are tons of videos on it. my current experience is limited to a chinese 6040 cnc router
03:51 PM Deejay: gn
03:55 PM _unreal_: REALLLLLLLLLY wishing I had gotten laid off
03:55 PM _unreal_: at this point
03:55 PM _unreal_: more and more BS hoops to jump though
05:20 PM unterhaus: the HF lathes used to be the worst of the Chinese small lathes, have they gotten better?
05:20 PM unterhaus: When I looked at them, it mostly looked like scrap
05:20 PM unterhaus: that has been a long time though
05:39 PM CaptHindsight: just low cost and resembles a lathe kit, U-Fix-It
06:12 PM _unreal_: ve7it, areyou around?
06:12 PM ve7it: yup
06:29 PM Tom_L: https://i.redd.it/briny26wnew41.jpg
06:29 PM _unreal_: hi
06:30 PM _unreal_: ve7it, i'm not sure which wire would go to which on the mesa
06:30 PM _unreal_: from your board
06:30 PM _unreal_: ve7it, tp19 TP18
06:31 PM _unreal_: or does it matter?
06:31 PM ve7it: step and dir ( really A and B for mode 2) go to the 2 inputs... you can always reverse them to make it go the other way
06:31 PM _unreal_: AHHHH... ok
06:32 PM _unreal_: so because its driving quad style doesnt matter
06:32 PM _unreal_: just depends on input
06:32 PM _unreal_: OK
06:32 PM ve7it: yup tp18 and 19
06:33 PM _unreal_: ve7it, ya pcw_home was saying just use the step/dir + pins dont worry about the step/dir - contacts
06:33 PM _unreal_: ve7it, how about error feed back? or is that even there
06:33 PM _unreal_: ?
06:33 PM ve7it: that should work
06:34 PM _unreal_: ?
06:34 PM _unreal_: how
06:34 PM _unreal_: err I should say is there a connection for reading an ERROR? from a motor controller to trigger a hault?
06:34 PM _unreal_: for the mesa
06:35 PM _unreal_: TP14 is just motor enable/disable
06:35 PM Tom_L: you could use a gpio and map it in hal
06:36 PM _unreal_: Tom_L, I dont know if there is an ERROR signal for drive fail out of range
06:36 PM ve7it: led1 is the fault led... you could add a wire to a gpio pin and you would then have notice there was a problem when the pin goes low
06:37 PM _unreal_: doesnt that one flicker a lot
06:37 PM _unreal_: ?
06:37 PM ve7it: cant remember
06:37 PM _unreal_: from the videos that one does a lot of blinking
06:37 PM _unreal_: dont know it would be all that use full?
06:40 PM ve7it: cant tell from the video... Ted made some I/O headers with LEDs... not sure what he used the leds for
06:41 PM _unreal_: hum
06:42 PM _unreal_: the blinking is two slow for motor direction control. so I'm assuming its the fault led's
06:43 PM ve7it: in any case, its a simple mater of programming... if you want a fault output, you can customize the code very easily to mean whatever you want... over temp, position error too large, drive limit exceeded, no encoder activity? a power supply status would take a little more hardware
06:46 PM ve7it: we did use leds back to back across the motor to give an idea of how hard the motor was being driven... remember this is a current (or torque) driver, so when its out of position, the control can request short peaks of current to move the motor
08:22 PM _unreal_: hum
08:44 PM _unreal_: ve7it, I guess I'm going to tie the TP14 pins all together and put them to a relay so I could shut down the motor controllers easy
08:44 PM _unreal_: rather then killing the mains power
08:48 PM elmo40: hi class. question. when the machine is reboot what tells the controller what tool is loaded? (in a machine with tool changers). Is there a sensor somewhere or is it simply assuming from last state/shut down?
08:49 PM elmo40: or is there a g-code that can recal the currently loaded tool?
08:49 PM elmo40: _unreal_: is your threaded rod machine cutting? i've been away for a while. ;-)
08:51 PM Tom_L: elmo40, this might answer and save me typing :D https://forum.linuxcnc.org/49-basic-configuration/31150-current-tool-number-permanent
08:52 PM _unreal_: elmo40, depends on your setup
10:54 PM jymmmm: Heh, a "commercial" version of the grill I found yesterday... https://www.amazon.com/UCO-Flatpack-Portable-Stainless-Steel/dp/B06W2JNN4N
11:17 PM JavaBean: thanks for the link jymmmm
11:19 PM jymmmm: JavaBean: Was I talking to you about the other one?
11:19 PM jymmmm: I dont recall who =)
11:19 PM JavaBean: i have no idea... i was just checking out a link to a grill that you posted
11:22 PM jymmmm: JavaBean: watch the video https://www.aliexpress.com/item/4000879208586.html
11:22 PM jymmmm: JavaBean: I was thinkng just use those match light briquets
11:24 PM JavaBean: no no NO!!!!!!!!!!!!!!! don't use those things, they may well be toxic and would poison your food
11:28 PM JavaBean: everytime i see someone use these thing in even a fireplace i want to beat their heads. https://www.amazon.com/Diamond-Strike-Fire-Starter-count/dp/B00UDSAE32/