On 25 Jun 2005 08:34:03 -0700, jim rozen
wrote:

In article ,
says...

A bit off topic but could be useful for some measurement problems.

Home brew, remote readout, lever type dial gauge
+-0.0025" & +-0.025" Full scale
Also usable with linear inductive sensors.

These are some pretty big files.

http://www.metalworking.com/DropBox/dial_gauge.txt
http://www.metalworking.com/DropBox/Circuit_diagram.jpg
http://www.metalworking.com/DropBox/Synchro_Sensor.jpg
http://www.metalworking.com/DropBox/Clocking_Workpiece.jpg

DoN mode on
It would help if you made the titles of the dropbox files
start with the same prefix, something like JimPent_dialgage, etc,
so that they all show up in a block.
DoN off

Cool project. It looks like the heart of the matter is a
syncro selsyn trasmitter, right? Is this off-the shelf, or
was it surplus?

Recently having gotten deep into my Federal electronic readout
I appreciate how interesting this stuff is. In that case they
ran the phase senstive detector with a resonant circuit front
end - and they missed soldering one of the fine wires inside
the inductor to the lead-out pin. It worked just fine for
about ten years before the connection went open and the thing
quit working.

Jim

The synchro is a surplus size size 08 control transmitter which
is a pretty common item in old aircraft instruments.

Sorry about the messy post.

jim