Re: Poor Mans DRO

I had the same questions. How do commercial DRO encoders like Sargon work?
I searched Ebay hoping to find a used commercial DRO to put on my low dollar mill/drill and was surprised that there were just a few listings. I found Bridgeport type mills with DROs for not much more than the price of a DRO system alone, interesting.

Does anyone have a suggestion for putting a moderately accurate, moderately priced 2 axis DRO on a low dollar mill? Are there any kits?

BTW, Thanks to all who posted info about mouse guts.


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> Why is it that almost all DROs seem to use rotary encoders vs linear
> encoders? (at least that I've heard of - bearing in mind I'm new to
> this and haven't actually ever _seen_ a DRO... :-) Is it a matter of
> it being easier to match the rotational step of a motor directly to a
> a rotary encoder - vs trying to get a rotational step, once driven
> through a lead/ball/etc screw arrangement, to match up to a linear
> increment?
>
> Thanks for any input!
>
> Jim