Re: [CAD_CAM_EDM_DRO] Laser mouse based DRO

That is only part of what you need to know. Is it linear over
the movement range? Do you get one pulse for exactly .0005
inches movement over the entire distance? The word "about"
should tell you what you need to know.

If you move it exactly 4 inches and move it back 4 inches
to the counts cancel? Not likely.

Interference is used all the time to measure distance. That is how
the step and repeat type integrated circuit production equipment position
the exposure masks. Interference works very well at those
resolution. It does not work accurately at the price of a laser mouse.

Pete.

----- Original Message -----
From: "Simon Arthur" <chroma@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, August 22, 2005 1:00 PM
Subject: Re: [CAD_CAM_EDM_DRO] Laser mouse based DRO


> According to the documentation, deviation over the span of 4 inches is
> about 5-10 "mouse counts" at 2000 dpi sensing. This means roughly
> 0.0035" error over a 4" span.
>