Re: [CAD_CAM_EDM_DRO] Inductosyn DRO was balls

vrsculptor wrote:

The cost for commercial 10" inductosyn bars is about $250. Heads

>another $250. The newall is definately cheaper unles you can make
>heads and boards yourself. As Jon points out the bar is just a
>square wave easily milled or etched. The commercial ones seems to
>have a zillion lines per inch but give you .00001 resolution which I
>don't need for a router.
>
>I wonder how many lines per inch would you need for .0001 and if the
>evaluation board would drive/read it? I'd be willing to give it a
>shot if I could get by with a reasonable number of lines per inch and
>the board has a chance of working.
>
>

I don't think they are very fine grain. Something like 10 waves / inch.
The rest is done
by interpolation. A printed circuit board maker that can handle a 30" x
1" circuit board
could probably make a batch of these for a couple of hundred bucks. I
might run a quote
to find out what my favorite board house can do.

Jon