Test/Tune Axis in pncconf

BigJohnT
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28 Aug 2011 14:58 #12793 by BigJohnT

Replied by BigJohnT on topic Re:Test/Tune Axis in pncconf

As I recall I got the feed following error down to < 0.0005" on the CHNC by using halscope and trying tiny amounts of FF's after getting it as best as I could with PID.

I can't find the conversation on the IRC logs about tuning

John

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cmorley
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28 Aug 2011 21:12 #12796 by cmorley

Replied by cmorley on topic Re:Test/Tune Axis in pncconf

your encoder resolution is going to hold you back. .0004 is pretty course.
but you should get much better then .05 ! and your acceleration should be able to go higher.
you need to tune them more.

Is there no encoder on the motor too?

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fgauder
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29 Aug 2011 21:50 #12836 by fgauder

Replied by fgauder on topic Re:Test/Tune Axis in pncconf

The Z axis has an encoder on the ball screw with 2540 counts per revolution and the X and Y axes have linear glass scales with the same resolution. It was designed to be a .0005"/.01mm machine back in the 80's. There are a ton of these out there, and I know several owners ready to go to ECM2 if I can get this thing functioning as well as they do with the Anilam controllers.

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cmorley
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31 Aug 2011 05:43 #12867 by cmorley

Replied by cmorley on topic Re:Test/Tune Axis in pncconf

Be interesting to see if the z axis is easier to tune and or more repeatable...

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