Brother TC-225 / TC-229 adventure!

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09 Aug 2017 18:56 #97253 by ihavenofish
oh, i think i see what yer saying. ill try these things tonight.

thanks.

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10 Aug 2017 01:45 #97267 by ihavenofish
Bias does nothing at all useful. Ff2 clamps error to below .001 but resonance is there still.

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10 Aug 2017 03:45 #97269 by PCW
To be useful as a counterbalance, bias must be used with torque mode drives
(so the bias is in the proper units, force in this case)

You might also improve tuning a bit by tuning the drives velocity loop

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10 Aug 2017 04:09 #97272 by ihavenofish
That makes sense. There's nothing on the drive I can see to tune... It's of course fine on the old control. There is no documentation of any kind for it.

Right now it's basically tracking well but with intermittent resonance above 100ipm or so

Thanks

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10 Aug 2017 04:46 #97273 by ihavenofish
ok I lied, theres some pots on the drive for speed, gain, and offset. I reaaaaly don't want to touch them as they are fine with the old control (which I'm not fully letting go of yet).

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10 Aug 2017 04:51 #97274 by ihavenofish
question: will the servo period affect tuning? as in, is faster better or worse, etc. I had it as 2khz, now its at 1khz. it seems to "feel' better, but it may be in my head.

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10 Aug 2017 14:05 #97291 by PCW
If you are trying to do some of the drives work for it (using LinuxCNCs D term = velocity feedback)
then a higher servo thread rate will allow a higher P term (and better following)

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10 Aug 2017 16:38 #97304 by ihavenofish
ah, ok. that's what I would have guessed, but it was feeling better slower. ill get back to tuning again after the rest f the machine is all done up. it works well enough at the moment to do the atc and other remaining features. then we'll get back to final tuning when were ready to run programs.

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14 Aug 2017 15:35 #97459 by ihavenofish
nice clean wiring all done. gotta recheck it for errors tonight, and then i will fire up with various IO one by one.

then we will be on to hal stuff. yay.

was thinking though that i need a testing interface. like an array of buttons to tun on and off or read IO. diagnostics basically. is there a prebuilt thing for that in linuxcnc?

thanks.

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14 Aug 2017 15:44 #97460 by andypugh
Have a look at: linuxcnc.org/docs/devel/html/man/man1/sim_pin.1.html

But that is only available in the master / 2.8 version.

Also be aware that you can't set a signal that already has a writer, and can't set a pin that is connected to a signal.

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