On Dec 4, 11:12 am, Bill Schwab wrote:
Hello all,

I need to engrave a degree scale on my evolving gizmo. One degree
increments will be fine. I can indicate the part on my RT, translate
the 1.25" or so to the scale location, and use the RT to locate the angles.

I am not clear on what to use to actually cut the lines. A quick search
reveals scribes, awls, pin vises, etc., but most of them look like they
are designed to be hand-held. I have scribe that I use for layout work,
but it would need to be "modified" (read destroyed) to fit on the
spindle of my mill-drill.

Any suggestions for the cutter and how to mount it in the spindle?

Thanks,

Bill

http://www.antaresinc.net/FactCutterGeometry.html

Or use a regular end mill 45 degrees down the side of the dial so it
makes a 90 degree vee cut.
If you have a sharp dovetail cutter you can almost duplicate the
engraver bit's lines.
A lathe threading bit in a flycutter should work but the end will
taper out excessively unless you cut all the way across the dial.
You might want to leave the OD large and take a cleanup cut afterwards
to remove the burrs.
If you polish it use a rigid backup block or a long strip of fine
sandpaper, not finger pressure.

The biggest problem I have with dials is losing count of which lines
should be longer while trying to remember the different ending points.