Re: [CAD_CAM_EDM_DRO] Re: DRO: USDigital new resolutions 250cpi x 4

beer@... wrote:

> Now, I've never actually done this, and given the cost of the encoder, I
> don't ever plan to, but THEORETICALLY, couldn't a guy use two encoders
> spaced an appropriate distance apart to double the resolution ?

We went through this over a year ago, and the answer (practically speaking)
is no. The reason is due to accuracy. The only way it will work is if the
encoders are both accurate to 1/8th of a cycle over the entire rotation.
If the error is greater, then they will be out of sync by at least one edge
somewhere during the rotation, getting the doubling logic out of sync.
Now, maybe you could come up with more complex adaptive logic that
would gloss over this problem, but the simple technique of X-oring
the two quadrature signals together would make a jumble of it.

Jon