norwick wrote:

I need to cut a spiral onto a silver rod.
The sides of the cut can be at 90 degrees/and/or inclined. I envisage
...
Any suggestions?

In one of the Foxfire books there is an article about how to rifle a gun
barrel 'by hand'. It would be some work to make the rig, but you could
modify their design, turn the cutter "inside-out" and make it work for
what you need.

The tool itself would require no electricity to use, but it wouldn't be
fast.

--
Carl West http://carl.west.home.comcast.net

change the 'DOT' to '.' to email me

"Clutter"? This is an object-rich environment.