#linuxcnc | Logs for 2019-03-20
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[00:04:00] <roycroft> 1240 is the highest speed
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[00:18:20] <fdarling> does anyone know if a PCI WiFi card adversely affects latency on LinuxCNC? I've read that onboard WiFi can cause issues sometimes
[00:20:35] <a-u> My understanding is always limited, but what I've gathered -- yes, many "extra" network, wifi, graphics, sound, etc. interfaces could all effect the RT aspects needed for LinuxCNC
[00:21:01] <a-u> With some of the now kinda ancient PC hardware, things clearly had an impact.
[00:21:46] <fdarling> if budget isn't an issue, what is a recommended LinuxCNC setup with low latency? I am shooting for a 4kHz servo thread (Mesa cards not software stepping)
[00:21:49] <a-u> Now... it seems not so much -- as some of us risky types have run firefox and played MP3s while leaving network / wifi running while running long LCNC jobs.
[00:23:03] <a-u> I've been using DC servo motors with external drivers and never touched a Mesa card... so maybe my experience is not a help.
[00:23:34] <a-u> We are using a circa 2012 Dell PC and have base set to 20,000 ns.
[00:23:53] <fdarling> a-u: what are you using to interface to the DC servos?
[00:26:46] <a-u> Geckodrive
[00:27:01] <fdarling> a-u: so you are using a step/dir interfaced drive then
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[00:27:35] <a-u> Yes
[00:30:39] <a-u> I think max production step rate is about 27000/sec
[00:32:32] <a-u> We have a RTAI error on launch... and while I don't have any hard info, it seems to be a launch fluke, as I can't find other signs that RTAI gets delayed.
[00:34:03] <a-u> But - kinda back to your question - the current PC has 5 or 7 cores so ideally the RT preempt all runs seamlessly and the other cores pick up graphics or network or other loads when the other cores and memory, etc. can get to them
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[00:36:01] <fdarling> a-u: you are using RTAI and not the uspace one?
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[02:58:27] <gloops> i get the rtai error on launch every time, cant see any reason or symptoms that anything is wrong with latency otherwise
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[03:06:03] <pink_vampire> gloops: screenshot
[03:06:26] <gloops> not on this PC
[03:08:02] <gloops> i think when i went into this before, if your step rate cannot meet the feed rate you will get a *joint following error ?
[03:17:23] <a-u> hey gloops - same here -- a RTAI error on launch, but no other obvious RT issues that I can find a way to spot.
[03:17:47] <a-u> And that error has followed across versions and PC hardware.
[03:18:19] <a-u> I can make it go away, but only by setting the base so high that speed is too limited.
[03:19:26] <gloops> well i just ignore it, my machine is pretty slow anyway 5m/m but nothing seems affected it runs fine
[03:23:31] <fdarling> there is also some confusion surround FF1 and OUTPUT_SCALE and such
[03:23:50] <fdarling> supposedly the PID units should all be in "real world" machine units and scaled to the analog output at the last step
[03:29:58] <a-u> Also yes to the step rate (possibly from base being too slow) not keeping up with the target feed rate triggers the joint following error. Those are awkward or terrifying depending on speed as all joints then try to instantly stop.
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[03:45:17] <Deejay> moin
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[05:06:06] <XXCoder> hard boiled eggs + taco sauce = surpising yummy
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[06:04:58] <jthornton> morning
[06:05:05] <XXCoder> hey
[06:05:12] <XXCoder> another record busting heat today
[06:05:18] <XXCoder> 77f jeez. old record was 69
[06:05:41] <Tom_L> morning
[06:06:46] <Tom_L> about average here 40° Hi 59
[06:07:09] <XXCoder> should be cooler tomorrow yay 67f
[06:07:15] <jthornton> yea normal here too
[06:07:16] <XXCoder> then rest of weekl 50sf
[06:07:34] <XXCoder> record since 1940s snow then record hot jeez
[06:07:52] <Tom_L> is 12L14 just mild steel?
[06:09:54] <jthornton> no, it has a higher lead content for easier machining
[06:10:19] <jthornton> but yes otherwise mild steel
[06:10:22] <Tom_L> ok
[06:10:27] <XXCoder> yummy
[06:10:42] <Tom_L> probably not the best for hardening
[06:11:01] <jthornton> no, not enough carbon to heat treat
[06:11:46] <Tom_L> not very weldable either so it says
[06:15:53] <Tom_L> is it similar to 1018?
[06:15:53] <jthornton> you getting any rain Tom_L
[06:16:07] <Tom_L> a little yesterday afternoon
[06:16:18] <jthornton> yea just with a higher lead content
[06:16:43] <Tom_L> i didn't want a whole bar but i think that's all i can get locally
[06:16:58] <Tom_L> fastenal has 3' bars of 1018
[06:17:07] <jthornton> you get it from the scrap yard?
[06:17:21] <Tom_L> the scrap is mostly aluminum
[06:17:30] <Tom_L> i've never shopped from this other place
[06:17:31] <Tom_L> new
[06:17:36] <jthornton> watch the price on steel at fastenal it's by the INCH
[06:17:44] <Tom_L> i figured
[06:17:55] <Tom_L> it's about 78 a stick new
[06:18:08] <jthornton> better off at online metals or similar
[06:18:09] <Tom_L> cut in half 88
[06:18:22] <jthornton> what size are you needing
[06:18:23] <Tom_L> but there's still shipping
[06:18:26] <Tom_L> 1"
[06:18:41] <jthornton> 1" square?
[06:18:44] <Tom_L> round
[06:18:52] <jthornton> how long?
[06:18:58] <Tom_L> just a piece :)
[06:19:07] <Tom_L> couple feet maybe
[06:19:21] <XXCoder> square eh 1"x1"x.0005" ;)
[06:20:14] <jthornton> you looking for low carbon or alloy?
[06:20:28] <Tom_L> just something easy to machine
[06:21:06] <Tom_L> probably 99% of what we ran was aluminum or ss
[06:21:07] <jthornton> mcmaster carr 12L14 is $15 for a foot
[06:21:24] <jthornton> $35 for 3'
[06:21:31] <jthornton> https://www.mcmaster.com
[06:21:37] <Tom_L> same as fastenal
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[06:22:06] <jthornton> your fastenal carries 12L14?
[06:22:23] <Tom_L> i'm not sure but i can call em after while
[06:22:41] <jthornton> I bet they don't carry that
[06:22:46] <Tom_L> probably not
[06:23:02] <Tom_L> but we do alot of machining around here so it's a possibility
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[06:24:52] <Tom_L> there's 3 of em within a stone's throw here
[06:24:54] <jthornton> https://www.fastenal.com
[06:25:22] <jthornton> says ships from manufacturer but the price is good at $68 for 12'
[06:25:33] <Tom_L> huh
[06:25:41] <Tom_L> cheaper than the other local store
[06:27:08] <Tom_L> looks like it ships out of texas
[06:27:27] <XXCoder> is it cheaper, shipped?
[06:28:21] <pink_vampire> https://www.onlinemetals.com
[06:28:26] <Tom_L> and i can pick up at branch
[06:28:32] <Tom_L> or deliver
[06:28:33] <pink_vampire> $10
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[06:30:05] <Tom_L> i saw that
[06:30:41] <Tom_L> but you're paying 112 for 12' which is nearly 2x more
[06:31:02] <Tom_L> 117
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[06:34:18] <pink_vampire> i thought it was 60 for 12" not 12'
[06:35:39] <Tom_L> 12' is standard bar length
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[06:40:45] <Tom_L> $20 to ship a $18 2'bar from online
[06:40:58] <Tom_L> may as well get a whole stick of it
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[08:21:31] <Elmo40> may as well
[08:21:45] <Elmo40> no local suppliers?
[08:39:58] <Tom_L> i think so
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[10:46:14] <a-u> Follow-up question to the earlier question about metal sources: Any suggestions for a vendor for steel wire?
[10:47:49] <a-u> I'm looking for modest amounts of 13 and 16 SWG basic steel wire.
[10:54:47] <SpeedEvil> mig wire at 1.2mm, for example, 15kg, 30 quid free ship.
[10:55:14] <SpeedEvil> however, I think this is about the thinnest this goes.
[10:55:21] <SpeedEvil> ^thickest
[10:57:00] <SpeedEvil> https://www.ebay.co.uk also is not too unreasonable.
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[11:23:07] <a-u> thanks SE - I need to go a bit bigger - about 1.6 and 2.3 mm. I found regional steel companies that will sell about what I want, but thought I'd check if anyone had ideas. Seems none of the area steel dealers do wire.
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[11:23:47] <SpeedEvil> Well - the fencewire is 2.5.
[11:23:53] <SpeedEvil> Also you get it thicker
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[11:27:26] <a-u> True - there is some fence wire that comes close, but last round of checking those were sensibly high tensile and galvanized. I was looking for non-galvanized and not as stiff. But I'll look at those again too.
[11:28:31] <SpeedEvil> Some of the stuff can be annealed.
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[11:34:20] <roycroft> i'm not sure i'd try to anneal galvanized wire
[11:34:23] <roycroft> that could be dangerous
[11:34:46] <roycroft> unless you enjoy having welder's fever
[11:35:02] <SpeedEvil> Outside, or with proper ventilation, or mechanically, or chemically, yes.
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[11:48:32] <jymmm> bailing wire?
[11:49:43] <a-u> Yes, thos are options but if/as this project scales up, likely choosing a more-ready wire would be a better approach for me. However, maybe I'd want to consider a galvanized finish too.
[11:51:04] <SpeedEvil> If it scales up I imagine metal suppliers that might not normally stock wire would behappy to order some for you
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[11:53:53] <jymmm> That "wire" sounds like what is used to make welded fencing
[11:54:20] <jymmm> big ass (forklift sized) spools
[12:07:19] <a-u> It is handy to have a forklift, but it seems I can get 50 / 100 lb coils which is the next step for testing. Yes, I'm looking for the wire that is ready for welding.
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[13:38:08] <Loetmichel> *ahh, nice. just had the tyres on the BMW changed. from 255/60R15 from about 2000 to 205/65R15 DOT 16... and *surprise* now the car drives a lot smoother. quite a bit reassuring considering i have to drive 500++km tomorrow. MAN were those old tyres done for. No threads left, cracks in the side walls and stone hard rubber. :-)
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[14:39:30] <pink_vampire> https://www.youtube.com
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[15:00:47] <Papagno> Hi at all. i have a problem with actual master with external_offset . in sim/axis/external_offset/jwp_z.ini if coomand g0 x100, the x axis run at 114mm/min , but max_velocity in ini file is =2 (120mm/min). this because parameter the exsternal offset : OFFSET_AV_RATIO = 0.05 . if change this , rapid g0 change value , not respect max_velocity value, maxvelocity value is scaled on OFFSET_AV_RATIO = 0.05. i thing not normal this
[15:00:47] <Papagno> . Some idea
[15:02:42] <jymmm> pink_vampire: You gonna be a Buffer girl?
[15:03:29] <pink_vampire> maybe, I need a benchtop grinder first
[15:05:11] <Loetmichel> jymmm: GNHIHI
[15:05:21] <Loetmichel> had to google that term
[15:05:29] <Loetmichel> wasnt disappointed ;)
[15:06:24] <Deejay> hmm, me too
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[15:20:27] <jymmm> Loetmichel: no clue what you are babbling about =) GNHIHI????
[15:23:51] <Tom_L> it's loet speak
[15:28:52] <gloops> Got Numerous Hopeless Ideas Havent I ?
[15:29:39] <Tom_L> must be a euro thing.
[15:30:54] <jymmm> Tom_L: I agree
[15:31:23] <Deejay> gnhihi is some kind of laughing sound
[15:34:34] <gloops> some gn - hee hee?
[15:35:02] <gloops> Goodness Knows Hee (Hi) Hee
[15:35:13] <Tom_L> seems my 2.8 issue may be pointing to the wrong .py version of remap
[15:35:38] <Tom_L> 2.7 & 2.8 aparently are different
[15:36:08] <Tom_L> further tests will verify this
[15:36:30] <gloops> ive never had any issue with it, from installing to running, it is an upgrade to 2.7 on wheezy though
[15:37:06] <Tom_L> i may have my ini pointing to a local copy of it instead of /usr/...
[15:38:23] <Tom_L> i copied some files local when i was working on my orient code
[15:41:13] <Loetmichel> jymmm: i was giggling
[15:42:15] <Loetmichel> about the "buffer girl" term
[15:42:31] <Loetmichel> google for yourself what urban dictionary has to say about it
[15:42:37] <Loetmichel> hence my giggling.
[15:43:03] <Loetmichel> i do know what you meant though. (or not?)
[15:44:48] <SpeedEvil> urbandictionary only has about five definitions though.
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[16:05:50] <jymmm> Loetmichel: Ah, you had to see the video pink_vampire had posted above my comment
[16:06:01] <Loetmichel> jymmm: i had
[16:06:17] <Loetmichel> thats why i said "i know what you meant"
[16:06:34] <Loetmichel> i was just laughing about the definition UD gave me
[16:07:11] <jymmm> Loetmichel: I dont dare look at what UD says =)
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[16:09:49] <Loetmichel> jymmm: maybe better that way. plausible deniability and so on ;)
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[16:10:35] <jymmm> Loetmichel: exactly
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[16:35:09] <XXCoder> sometimes it amazes me. one deaf black guy was brutually beaten till he was knocked out in flornia state in 2016. What is he doing now? running to be part of city council, in order to change police.
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[17:14:58] <a-u> The guy running for city council - is he the famous Florida Man?
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[17:15:50] <a-u> Just a bad attempt at humor. FL has some issues.
[17:18:25] <jymmm> XXCoder: So they now beat all deaf people, not just the black ones... EQUALITY FOR ALL
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[17:54:10] <gloops> Great news from @Ford! They are investing nearly $1 BILLION in Flat Rock, Michigan for auto production
[17:54:41] <gloops> cnc jobs maybe
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[17:59:53] <roycroft> probably fake news
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[18:03:57] <gloops> https://www.bloomberg.com
[18:04:11] <gloops> investing in electric vehicles
[18:05:47] <_unreal_> any one here who compiles kernels now and then?
[18:05:58] <Elmo40> wha?? they want to build in Michigan?
[18:08:03] <Loetmichel> gloops: still better than GM. they already HAD a pretty good vehicle in 1996... they destroyed all but three of them after production ended in 1999
[18:10:58] <Deejay> gn8
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[18:16:38] <jymmm> Haha... the #1 British food is Chicken Tikki Masala
[18:17:41] BitEvil is now known as SpeedEvil
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[20:07:23] <Tom_L> ran into a local guy that knew about linuxcnc. was kinda surprised really...
[20:08:59] <pink_vampire> lol
[20:17:42] <SpeedEvil> :)
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[21:35:57] <Elmo40> Tom_L, it has been around for a LONG time.
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[22:00:25] <Tom_L> yeah i remember it's infancy
[22:03:39] <Elmo40> when this was #emc ;-)
[22:04:34] <Tom_L> possibly before #emc was
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[23:06:54] <pink_vampire> is there a way to add "Home all" button?
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[23:10:20] <Tom_L> yes
[23:10:28] <pink_vampire> how?
[23:10:29] <Tom_L> look at my config
[23:10:38] <pink_vampire> thanks
[23:10:39] <Tom_L> you want to home z first
[23:10:45] <Tom_L> or you'll hit something
[23:10:59] <Tom_L> oh you mean the initial home?
[23:11:02] <pink_vampire> i want to jog all the axis > hit home all
[23:11:17] <Tom_L> or send it to g54 home?
[23:12:06] <Tom_L> http://tom-itx.no-ip.biz:81
[23:12:26] <pink_vampire> instead of click "Home Axis" 4 times, i just want one button that will home all of them
[23:12:28] <Tom_L> the zero axis button sends mine to G54 x y z 0 after i've set the offset
[23:12:35] <Tom_L> set that up in the ini
[23:12:40] <Tom_L> the home sequence
[23:13:07] <pink_vampire> not the touch off
[23:13:09] <Tom_L> you're talking about on machine power up?
[23:13:17] <Tom_L> that's in the ini
[23:13:34] <pink_vampire> ones sec i will take a pic
[23:14:07] <Tom_L> HOME_SEQUENCE = 1
[23:14:13] <Tom_L> sets the order they home in
[23:14:24] <Tom_L> if x & y are 1 they will home together
[23:14:29] <Tom_L> i set z at 0
[23:14:34] <Tom_L> so it homes first
[23:15:07] <Tom_L> HOME_SEQUENCE = 0
[23:15:09] <Tom_L> for z
[23:15:17] <pink_vampire> i don't have home switches
[23:15:19] <Tom_L> x & y are 1
[23:15:29] <Tom_L> not sure then
[23:15:36] <Tom_L> add them?
[23:16:03] <Tom_L> or read about HOME_SEQUENCE and soft limits
[23:16:34] <Tom_L> i've always used limit switches
[23:17:00] <pink_vampire> https://i.imgur.com i'm talking about those homing buttons (there is one for each axis)
[23:17:06] <Tom_L> http://linuxcnc.org
[23:17:49] <pink_vampire> what the "home axis" button send?
[23:17:54] <Tom_L> i hit the same button and all mine home in the sequence specified in the ini with HOME_SEQUENCE
[23:18:25] <Tom_L> set it in each [axis] section
[23:19:21] <pink_vampire> but you need home switches for that?
[23:20:23] <Tom_L> i'm not sure. try it
[23:20:28] <pink_vampire> i know about axis.0.homing
[23:21:50] <Tom_L> HOME_SEARCH_VEL A value of zero causes LinuxCNC to assume that there is no home switch; the search stage of homing is skipped.
[23:21:51] <pink_vampire> but i there some way to push homing for "any" axis?
[23:22:02] <Tom_L> read the homing section
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[23:22:19] <pink_vampire> let me see
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[23:39:44] <pink_vampire> Tom_L: i got to the point that i have the "home all" but how to i make it with the individual home buttons?
[23:40:16] <Tom_L> i thought 'home all' was what you wanted
[23:40:45] <Elmo40> any laser guys? seen this before?
[23:40:45] <Elmo40> https://github.com
[23:42:35] <pink_vampire> Elmo40: interesting
[23:43:01] <Elmo40> looks very functional
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