#linuxcnc | Logs for 2018-12-12
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[02:50:22] <Deejay> moin
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[02:56:56] <pink_vampire> hi
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[10:02:44] <gregcnc> Wow 10k
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[10:04:50] <rmu> 10k and ethnernet protocol
[10:05:44] <pcw_home> Yeah 10K will work with some systems and our PCI cards but not Ethernet/EtherCAT
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[10:06:34] <pcw_home> 10K servo thread
[10:07:48] <gregcnc> oh, a few weeks ago someone stopped in running a mesa setup of some kind with 500,000 latency with no trouble, can't remember what he asked about though
[10:08:31] <pcw_home> as long as you meet the deadline, latency only has secondary effects
[10:09:01] <pcw_home> (with hardware step generation or encoder counting)
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[10:11:10] <pcw_home> if you consider a hardware step/dir system, even a totally missed update cycle is a no-op if you are moving at a constant velocity
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[10:12:12] <pcw_home> and only causes a minor error during acceleration (for low acceleration machines like mills/lathes)
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[16:14:28] <XXCoder> pcw_home: he said latency was 15k and set it to 10k? dang
[16:14:45] <XXCoder> my setup it is 15k and I set it to 25k to give plenty of room
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[16:23:53] <pcw_mesa> No, he set the base thread to 100K (10 KHz) but base thread makes no sense with EtherCAT AFAIK
[16:24:56] <XXCoder> oh misunderstood. thanks
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[16:56:20] <Deejay> gn8
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[19:59:06] <ziper> I'm worried my belts are way too whimpy
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[20:42:34] <andypugh> which belts?
[20:42:53] <andypugh> Mini lathe?
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[20:45:37] <ziper> router table. GT2 6mm width
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[20:46:44] <andypugh> I would imagine that some design effort went in to it.
[20:47:30] <andypugh> When the design is “guess” or “loks right” the errer is generally too big rather than too small.
[20:48:33] <ziper> uhh I can confirm that very little design effort went into it
[20:48:58] <andypugh> It’s not that hard to convert your motor torque in to a belt tension and see if it’s within spec.
[20:49:23] <andypugh> Is this your own design?
[20:49:38] <andypugh> (I came in late)
[20:51:32] <ziper> yes
[20:52:05] <andypugh> What is your motor torque?
[20:55:40] <ziper> 1.26 Nm
[20:56:20] <ziper> pulley diamter 16mm
[20:59:38] <andypugh> http://www.sdp-si.com
[20:59:57] <andypugh> After a quick glance, I think you are fine.
[21:09:59] <ziper> aye, but now I am worried the gantry will be too heavy
[21:40:40] <Tom_itx> what is this for?
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