Splitting encoder signal to closed loop drive and linuxcnc for homing with index

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01 Jun 2019 10:57 #135556 by microsprintbuilder
Has anyone ever used a encoder signal from a servo motor to provide feedback to a servo drive and linuxcnc. I'm looking to retro fit a older Hitachi seiki lathe with DC brushed motors and spindle. The motors all have encoders but no tach's. I was thinking of replacing the drives with Gecko G320X closed loop drives. But they don't provide an encoder out. I also need encoder feedback to linuxcnc thru a Mesa card to have a homing with index for precise repeatability. I was wondering if this has been done before and if there is any problems doing it. The spindle is easy as I will just build a simple mosfet drive with forward reverse relay.

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01 Jun 2019 12:07 #135559 by Todd Zuercher
There are better drive options than a Gecko 320x. Most will offer an encoder feedback for the control.

Is your machine an old Fanuc control with simulated tack feedback form the control? (it is possible to do that using Linuxcnc and the right hardware.

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01 Jun 2019 16:06 #135574 by microsprintbuilder
You Failed to answer my question. You are no help at all.

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01 Jun 2019 16:28 #135576 by Todd Zuercher
It can work but is more prone to noise issues.

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