#linuxcnc Logs
Mar 29 2020
#linuxcnc Calendar
03:20 AM Deejay: moin
03:25 AM fdarling: _unreal_ does the spacing between the bearings dictate the thickness of blade you can use? Or is there some adjustment?
05:30 AM p0g0: jthornton, hey, you made it to the front page of the NYTimes ("America Stress Bought All the Baby Chickens").
05:38 AM XXCoder: lol
05:49 AM jthornton: lol
05:49 AM jthornton: Cackle Hatchery still has baby chicks for sale
05:56 AM pink_vampire: hi
05:56 AM XXCoder: hey pink
05:56 AM pink_vampire: hi XXCoder
05:56 AM XXCoder: check out https://youtu.be/VFM8vISG53Q
05:56 AM XXCoder: jt you too
05:57 AM pink_vampire: not cutting?
05:57 AM XXCoder: nah its just to show spotlight effect
05:57 AM pink_vampire: laser power dropped?
05:57 AM XXCoder: you can see how tight its focused
05:58 AM XXCoder: but theres still bright spot around it, losing power :(
05:59 AM pink_vampire: maybe you need to re-focus it ?
05:59 AM XXCoder: its tight focus
05:59 AM XXCoder: you can see the spot as it crosses center black spot
06:01 AM pink_vampire: maybe something happen to the laser diode?
06:01 AM XXCoder: possibly
06:01 AM pink_vampire: is that a laser array?
06:01 AM XXCoder: laser diode
06:02 AM XXCoder: ok not sure what "laser array" is lol
06:02 AM pink_vampire: in laser diode array there is several small diodes that make the beam
06:03 AM XXCoder: ahh I see
06:03 AM XXCoder: it seemed like single diode but could be wrong
06:04 AM pink_vampire: and if some of them die, or the optics move, (like small mirrors)
06:05 AM XXCoder: its possible
06:05 AM XXCoder: i sent video to store see what they say about it
06:05 AM pink_vampire: can you take the diode apart?
06:06 AM XXCoder: maybe though waiting for 5.5w one to arrive first :)
06:07 AM pink_vampire: maybe..
06:07 AM pink_vampire: https://www.youtube.com/watch?v=MaGOuNMQRXM
06:08 AM pink_vampire: the way he bump the probe in 12:00 make me jump in the seat.
06:08 AM pink_vampire: I mean the rapid moves
06:09 AM XXCoder: erm dunno im not expert with probes but that seems fast lol
06:09 AM XXCoder: its so expensive
06:10 AM pink_vampire: $5000 bump
06:10 AM pink_vampire: the Z bump was abit OMG
06:12 AM XXCoder: i just wouldnt do it that way lol
06:16 AM pink_vampire: I like the way he is making the chamfers in advance for the holes.
06:17 AM XXCoder: little more wear for tool but can be done yeah
06:21 AM XXCoder: jthornton: if you decide to use laserweb for controlling laser machine, its fine, just dont generate gcode on it from svgs
06:21 AM XXCoder: for some reason laserweb really sucks on that
06:45 AM jymmmm: XXCoder: what did you use to generate the SVG's?
06:46 AM XXCoder: svgs? inkscape
06:46 AM XXCoder: some svgs is downloaded
06:47 AM jymmmm: XXCoder: Ok, there is a "bug" in the SVG Spec itself that it brought forward in inkscape, been there for years. Go into the XML (text) and look at absolute dimensions and see if they are what you expect them to be
06:47 AM XXCoder: pts vs mm
06:48 AM XXCoder: ?
06:48 AM XXCoder: i found that bug in different context yeah its annoying
06:48 AM jymmmm: You might see 5.0457 instead of 5.0000
06:48 AM XXCoder: ahh ok
06:49 AM jymmmm: IDK the specifics of why, just that it exists
06:50 AM XXCoder: sorta reminds me of that cpu bug where number is .00000123223whatever off
06:50 AM jthornton: floating point error?
06:50 AM XXCoder: yeah been long time ago. intel lol
07:00 AM Loetmichel: "why is the intel pention called pentium and not 586?" "because intel did 486+100 on a prototype, then decided "ah, lets call it pentium instead" ;)
07:01 AM Loetmichel: it was not THAT long ago
07:09 AM XXCoder: true, dinsours recently died out that time. recent allright
07:26 AM Tom_L: http://www.opensbp.com/#programming
07:27 AM XXCoder: is it different language like gcode is?
07:27 AM Tom_L: i think so
07:27 AM XXCoder: seems so. interesting
07:28 AM XXCoder: http://www.opensbp.com/files/ComRef.pdf
09:42 AM jthornton: Jonesboro Ar mall hit by a tornado last night and ripped open one of the stores and flipped some cars
09:48 AM jymmmm: jthornton: ouch, anyone hurt?
09:49 AM JT-Shop: dunno, just saw some photos on wifes phone
10:03 AM jymmmm: ah ok, I just see videos of the touch down..
10:36 AM _unreal_: does this price seem right? https://www.walmart.com/ip/Philips-Hue-3241312018A-3rd-Generation-Bridge-2-1-Hub-White-Refurbished/800235842
11:20 AM flyback is now known as ceaser
11:20 AM ceaser is now known as flyyback
11:21 AM flyyback is now known as flyback
11:55 AM JavaBean|new is now known as JavaBean
12:16 PM wellindex: i followed big John's instructions for RT preemt kernel for Mint it boots fine other than I have to move and click the mouse to get to the login screen I have two identical optiplex machines 1 3.4gh 1 2.8gh the 3.4 doesn't seem to have the issue it also has regular HDD the 2.8 has SSD it seems like it goes to hibernation if I hit esc before it's done booting it goes to the login anyone have any suggestions to try
12:17 PM wellindex: it also boots right into login in the stock kernel
12:20 PM wellindex: intel i3 both of them
12:26 PM wellindex: google has been unhelpful anyone know anyplace to look for help?
12:28 PM JavaBean: might need to wait a bit, the normal "experts" might be AFK right now
01:25 PM burklefoo: wellindex: might be related https://wiki.debian.org/BoottimeEntropyStarvation
01:33 PM wellindex: looking
01:40 PM wellindex: do you think this would affect mint 19 also the generic kernel image boots fine & why would the esc key make a differance?
01:40 PM unterhaus: I'm not a long time mint user, but moving the mouse to get to the login screen sounds normal to me, very annoying though
01:43 PM wellindex: it shouldn't be at boot up like I said the generic kernel boots fine I also have a optiplex same setup that boots to the login
01:44 PM burklefoo: I just mention it because is did solve a forum users boot-up issues
01:44 PM burklefoo: it did
01:46 PM wellindex: worth a try is that on the form somewhere?
01:47 PM burklefoo: I think the guy that's been making the Mint 19.1 ISOs just included the entropy stuff
01:48 PM burklefoo: I hadn't paid too much attention since my Mint/preempt-rt install doesn't seem to have that issue
01:50 PM wellindex: thanks I'll report back. one of mine is fine also I reinstalled this one more than once with no good results could be the i3 2.8gh and mother board combo
02:01 PM ziper: why do you have to lap with the reciprocating motion? why couldn't you do it solely with the rotary motion? https://youtu.be/-w4R2eAHHiI?t=809
02:16 PM wellindex: just got to say just went to look into BoottimeEntropyStarvation on that machine and it booted right I also noticed when I booted to the generic kernel then to the RT_Preemt it booted fine unlpuged over night to connect it to the cnc the problem showed again head scratcher so for now its fine i'll keep that BoottimeEntropyStarvation page in mind if it shows again thanks
02:19 PM wellindex: ziper i think its more about surface area and lap reloading the center would move at a low rate compared to the outside
04:22 PM _unreal_: Gotten Major steps done on my cnc today
04:22 PM _unreal_: almost finished building the power supply
04:22 PM _unreal_: That is a huge leap
04:27 PM unterhaus: swirling is too random for lapping. Each linear stroke makes grooves. Eventually through enough angles you make peaks, and then knock down the peaks
04:27 PM SpeedEvil: :)
04:27 PM unterhaus: well, that was wasted :)
04:29 PM unterhaus: I got so good at lapping that my microscope didn't work because all the light bounced off
04:29 PM unterhaus: didn't have confocal lighting
04:29 PM XXCoder: lol
04:30 PM unterhaus: That was a bad day, but it was okay once I figured it out because I didn't have to go to such small grit
04:32 PM unterhaus: I would be amused that liberty university has covid rampant if my brother didn't live nearby
04:32 PM p0g0: XXCoder, it's 2 for 2- thehill.com has your plight detailed today, so between chicks and Puget aerospace industry, some folks in this channel are getting active coverage.
04:33 PM XXCoder: got link?
04:34 PM p0g0: https://thehill.com/policy/defense/490017-coronavirus-hits-defense-contractor-jobs
04:35 PM XXCoder: looking
04:35 PM XXCoder: yeah. good thing company I work for isnt purely defense contractor only
04:35 PM XXCoder: subdivision in calfornia is i think
04:37 PM XXCoder: advised to avoid travel to europe and asia yeah how about avoiding any trips in usa
04:43 PM p0g0: unterhaus, I agree- it is wishful thinking that only the wanton will suffer. I get crankier than ever with my End of Days neighbors, being Holier Than isn't a license to kill.
04:44 PM XXCoder: theres always a few ones that think if it fails to happen, they have to help it along
04:44 PM p0g0: More than a few of them here...
04:45 PM p0g0: Open sedition is becoming common.
04:45 PM XXCoder: in what form?
04:46 PM XXCoder: i doubt its in form of just dumb sign holding
04:58 PM p0g0: sry, remotes access to a Vm seems to grab odd key sequences and steal the mouse and keyboard...
04:58 PM XXCoder: no plm
04:59 PM p0g0: I have kids mouthing off about armed insurrection and such. they are clueless but dumb enough to get into trouble.
04:59 PM skunkworks: andypugh: did you see aluminum? https://www.youtube.com/watch?v=C0Wz8vnFAQU
05:00 PM p0g0: local boys, it is different than the usual whinging and griping.
05:00 PM p0g0: biaw
05:00 PM XXCoder: :(
05:00 PM XXCoder: skunkworks: ohhh alum
05:00 PM skunkworks: that spindle has quite a bit of torque at that rpm..\
05:00 PM XXCoder: amazing
05:00 PM skunkworks: for some definition of torque..
05:09 PM unterhaus: skunkworks, what sensors are you using for the spindle position?
05:10 PM skunkworks: gear tooth sensors.. Let me see if I can find the part number
05:13 PM _unreal_: skunkworks, I'm trying to find a spindle that I could to motion control like your doing but I have not found one yet :/
05:13 PM _unreal_: china spindles
05:17 PM Tom_L: most of the ones i've found are high rpm
05:24 PM burklefoo: skunkworks: that might work well for little aluminum plugs with allen sockets (a very stout say only 1/4 extension beyond shank boring bar would do for this)
05:26 PM burklefoo: _unreal_: the spindle need not be motion controlled since the axis motion is "geared" to the spindle position
05:40 PM Deejay: gn8
05:47 PM _unreal_: burklefoo, What I mean is rotation feed back
05:47 PM _unreal_: so I can control the spindle rotation speed
05:47 PM _unreal_: but I dont think that would work well with the china spindles
05:47 PM _unreal_: I'm prob going with a 1.5kw
05:48 PM _unreal_: I'd rather a 2kw+ but I dont think it would fit
05:59 PM Tom_L: _unreal_, they use modbus on some of the chinese ones
05:59 PM Tom_L: they have comps for a couple
05:59 PM _unreal_: comps?
05:59 PM _unreal_: hum
06:00 PM Tom_L: http://linuxcnc.org/docs/2.8/html/man/man1/mitsub_vfd.1.html
06:00 PM Tom_L: for one
06:01 PM _unreal_: Tom_L, I ordered the 7i96
06:01 PM Tom_L: saw that
06:02 PM _unreal_: looking at that site but I dont see anything listing THE spindle?
06:02 PM Tom_L: you know JT is a distributor for mesa right?
06:03 PM Tom_L: what signals do you need for the spindle?
06:03 PM Tom_L: some of the mesa boards put out +-10v for that
06:03 PM Tom_L: mine has 0-10v
06:03 PM skunkworks: unterhaus: https://www.digikey.com/products/en?keywords=6%20620-1328-1-ND
06:04 PM _unreal_: Tom_L, I'm just looking at skunkworks work
06:04 PM skunkworks: burklefoo: I read what you wrote twice - I am not undestanding..
06:04 PM _unreal_: thinking it would be interesting to do that
06:04 PM _unreal_: with the new machine
06:04 PM Tom_L: what's that?
06:04 PM _unreal_: but I'd have to have a spindle with precision control
06:04 PM skunkworks: _unreal_: the spindle isn't a servo in the conventional sense..
06:04 PM Tom_L: oh the hex?
06:05 PM _unreal_: skunkworks, go on..
06:05 PM Tom_L: i'm afraid mine would stall if i tried that low rpm
06:05 PM _unreal_: I assume a given RPM?
06:05 PM gregcnc: the axes follow the spindle just like threading
06:05 PM Tom_L: he's probably got them locked together likg gregcnc said
06:06 PM _unreal_: right and I'd need a spindle that is capable of that. i assume there are none "chines spindles" that can do that
06:06 PM gregcnc: you do need a spindle with enough torque at that RPM
06:06 PM _unreal_: Tom_L, same here
06:07 PM Tom_L: gregcnc, that's what i'm holding out for
06:07 PM _unreal_: gregcnc, do you know if any spindles that have position feed back?
06:07 PM gregcnc: a 24kRPM spindle won't work
06:07 PM Tom_L: don't want a 'high speed' chinaco spindle
06:07 PM burklefoo: skunkworks: just that a very short (and therefor stiff) boring bar could make quite small and accurate hex holes
06:07 PM skunkworks: burklefoo: oh - yes.
06:07 PM Tom_L: _unreal_, you can always add it
06:07 PM _unreal_: gregcnc, sadly I need the 24k range
06:08 PM Tom_L: you won't have any bottom end torque then
06:08 PM _unreal_: Tom_L, I dont believe they can do that level of resolution
06:08 PM gregcnc: unreal none of the high speed spindle have encoders because they make very little torque at low speed
06:08 PM Tom_L: the VFD probably can
06:08 PM skunkworks: _unreal_: Linuxcnc reads the spindle encoder and calculates where the x/y axis should be to create a hex..\
06:08 PM _unreal_: so I would need a second spidle
06:09 PM _unreal_: small slave setup
06:09 PM gregcnc: to be honest with 24kRPM you could run a tiny endmill and be done jsut as fast?
06:09 PM skunkworks: probably.
06:09 PM Tom_L: where's the fun in that though?
06:09 PM _unreal_: freaking hel
06:09 PM skunkworks: I know - right?
06:10 PM _unreal_: no no...
06:10 PM Tom_L: i did hex with a .125 em for a couple projects
06:10 PM _unreal_: I just looked down and almost spit my rum/coke out
06:10 PM XXCoder: depends on corner tols I guess
06:10 PM _unreal_: sun is setting and there is a single small sun beam on my nuts
06:10 PM * skunkworks has brandy and 7up....
06:10 PM _unreal_: peaking though the curtains
06:11 PM _unreal_: just wasnt expecting it
06:11 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Assembly/Final/Vise_parts/Speedhandle2.jpg
06:12 PM _unreal_: wtf is that?
06:12 PM Tom_L: did that with a .125 em and just hit the corners a bit with a triangular file
06:12 PM _unreal_: aside from pretty
06:12 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Assembly/Final/Vise_parts/Speedhandle_fit2.jpg
06:12 PM _unreal_: oh torque and speed
06:13 PM Tom_L: honestly the short part gets it plenty tight
06:14 PM _unreal_: later on I'll snape some photos of the PSU box
06:16 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/Mill_Steel/Assembly/Final/Vise_parts/table_slot1.jpg
06:16 PM Tom_L: cut a slot in the table for the vise since it was an unconventional table
06:36 PM unterhaus: I looked at anders wallin's estop circuit and he has his limit switches in the estop chain. I am wondering if I should do something similar
06:37 PM unterhaus: but I would need to have some way of stopping the motors. Which is complex
06:37 PM unterhaus: But my mill table weighs hundreds of pounds.
06:37 PM XXCoder: you can always inject + to all wires, causing steppers to just stop
06:37 PM unterhaus: brushless
06:37 PM XXCoder: not only stopped, but locked in place till power is removed
06:38 PM unterhaus: I know what the circuit should be. Contactor with some big ass resistors
06:38 PM unterhaus: motors stop themselves
06:39 PM XXCoder: cool :)
06:40 PM burklefoo: Normally you just pull down the DC bus with a brake resistor
07:26 PM roycroft: a
07:59 PM unterhaus_: using a braking resistor doesn't cover a drive runaway condition. Probably covers most times when you have a limit switch violation though
08:01 PM burklefoo: Drive runaway is pretty unlikely on AC drives
08:02 PM burklefoo: basically means a software crash in the drive
08:06 PM burklefoo: the drive firmware would need to continue commutation while ignoring commands/inhibits/following errors etc
08:06 PM jdh: https://i.imgur.com/xT4YgXl.jpg
08:31 PM sync: not even a crash burklefoo
08:31 PM sync: but an error where the command runs away
08:43 PM burklefoo: that should be difficult if the controller is monitoring the drive
08:45 PM gregcnc: all depends on how it's built
09:19 PM _unreal_: I'm calling it
09:19 PM _unreal_: its 10:18pm and my 30watt soldering iron is DOA
09:19 PM _unreal_: non fixable
09:19 PM _unreal_: the heating element is fucked
09:19 PM _unreal_: :(
09:19 PM _unreal_: I've had that soldering iron for ? 30 years
09:22 PM * JavaBean considers play 'taps', doesn't have a bugle
09:22 PM _unreal_: JavaBean, its even worse then that....
09:22 PM _unreal_: it was a radioshack soldering iron
09:23 PM _unreal_: :(
09:23 PM JavaBean: i have a radioshack soldering station... don't ask me where it is, i just moved
10:04 PM * roycroft has a hakko soldering station that's about that old, but it still works fine (knock on lead)
10:05 PM JavaBean: i got mine during the "firesale" as the company died
10:07 PM _unreal_: bunch of things I wish i had purchased
10:07 PM _unreal_: before they died
10:07 PM _unreal_: and I think I spent like 2k with them