Re: [CAD_CAM_EDM_DRO] reducing the encoder line count

jmw@... wrote:

> Jon,
> I saw these three facny looking encoders on ebay for $24.95 the set.
> Sounded like my kind of numbers. I checked w/ the company Disc merged
> into re spec. The tech went off to hunt in the vaults when confronted
> w/ an obsolete part number and came back and said the the unit had
> 1968 lines, and wondered why anyone would want that, but there you
> had it.
>
> I just assumed that commonly available software / motion controllers
> wouldn't like this oddball number, but I thought I'd buy em anyway.
> They look like the kind of thing that would cost $$249.50 each, your
> tax dollars at waste. So if it turns out they can be used as is, well
> so much the better. They've A,B,not A, not B, index, etc.

Most software wants a number of steps/encoder counts per user
unit (inch or mm) and doesn't really care if it is oddball. A number
of installations use oddball counts to compensate for leadscrew
error and such. ie, a system that is supposed to have 2500 counts/inch,
but actually, due to leadscrew error, the best accuracy is obtained
by setting the software to 2499 counts/inch.

So, most software should accept this encoder without trouble.
The index channel allows for more precise homing.

Jon