Re: [CAD_CAM_EDM_DRO] Re: Poor Mans DRO

The only DRO that uses a rotary encoder is the Shooting Star Digital Unit
(advertized in HSM, and MW, and I think LS). My retrofit (I e-mailed DXF &
DWG files of it to someone on this list last year) helps to keep the gear
rack/encoder free of swarf. I guess I could post it somewhere convenient,
but where is best?

RayHex

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> From: Jon Elson <elson@...>
>
>
> Nearly ALL commercial/industrial grade DROs use linear encoders or
> measuring units of some sort. Sony uses either glass or magnetic scales.
> Accu-Rite, Mitutoyo and many others use glass optical scales. Newall

uses a

> unique scheme with precision steel balls in a tube. Another outfit times
> the flight of mechanical pulses (sound waves) in a steel wire with a
> magnetostrictive coupling. I have not seen any commercial DROs with
> rotary encoders. The reason is keeping coolant out of the works is
> very difficult. These units sell for $700 - $1500 or so for standard
> 2 and 3-axis systems.

<snip>