LinuxCNC as DRO

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04 Sep 2017 00:18 #98435 by Peter
Peter created the topic: LinuxCNC as DRO
Hi all,
I am getting ready to give my bridgeport clone the DROs it deserves.

it is a fully manual Mill, (NO Powerfeeds)

I am wondering what might be the best setup for hardware if I was only interested in DRO functionality.
what considerations are there when choosing between Rotary Encoders and say Glass Scales or other?
also what are people using to monitor there spindle speeds?
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04 Sep 2017 01:15 #98436 by PCW
PCW replied the topic: LinuxCNC as DRO
I would think linear scales are the only thing that makes sense with ACME threads and their large backlash

A single proximity switch should be adequate to measure spindle speed if there's a convenient place to mount it
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04 Sep 2017 12:30 #98457 by andypugh
andypugh replied the topic: LinuxCNC as DRO

Peter wrote: I am wondering what might be the best setup for hardware if I was only interested in DRO functionality.


Probably glass scales and an Arduino. LinuxCNC seems overkill.

It might make more sense just to get a commercial DRO kit.
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04 Sep 2017 13:52 #98474 by Peter
Peter replied the topic: LinuxCNC as DRO
hey guys, thanks for the replys

this is just a prof of concept for me, I have much bigger plans of standardizing the interface of all the machines in my shop.
this would just be a stepping off point.

I am currently building a plasma table that I plan to run LinuxCNC on.

you guys are totally correct about the scales I'm just being cheep.

as for spindle monitoring, I guess just an optical sensor is all people are using?
Thanks
-Peter
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04 Sep 2017 14:24 #98476 by andypugh
andypugh replied the topic: LinuxCNC as DRO

Peter wrote: as for spindle monitoring, I guess just an optical sensor is all people are using?


That will depend on the application. Some use a single opto or a proximity sensor watching a gear. My machines both use resolvers on the spindle. Some people end up using super-high precision encoders (like the Heidenhain ROD). It rather depends on the application.
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