Re: [CAD_CAM_EDM_DRO] Digest Number 1685

Try finding some old "SAMS" books from Radio Shack. Years ago they had some
with plenty of "count by" circuits that could easily be connected to either
a mechanical or an optical pick-up.

As I recall, those circuits were easy to build and were connect to large LED
readouts.

Smoke

> > At the recent P.R.I.M.E. show the Sherline booth had on display a

conversion

> > to the pulleys that gave the machine up to 10,000 rpm capability. As

one of

> > my interests for this machine is engraving I thought it a worthy
> > conversion... so I made my own. And it works! My question is; do any of

you

> > worthies know of a source for a tachometer kit, schematic, or plans for

an

> > optical pickup tachometer reading to the 10K to 20K rpm level in

probably 3

> > digits ( x100 )?
>
>