Inductosyn DRO was balls

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:

>http://products.analog.com/products/info.asp?product=AD2S90
>AD2S90-EB PRODUCTION Evaluation Boards - COMMERCIAL $89.06
>AD2S90AP PRODUCTION PLASTIC LEAD CHIP CARRIER 20 COMMERCIAL $29.16

snip

> Making an Inductosyn seems a LOT simpler, as the geometry is pretty
> straightforward. It has a planar square wave exiting winding which

forms the scale, and 2 planar square wave sense windings which have
the same wave length as the exciting winding, but they are placed
such that there is a 90 degree phase shift between the two windings.
These can be made by printed circuit technology. You just hook it
all to the 2S90 series of chips.

>

Great tutorial on resolvers @
http://www.naii.com/pub_files/synchrohandbookch1_2.pdf

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.

Roger