"Grant Erwin" wrote in message
...

Is this a through slot or a blind slot? If it's a through slot, then
you can use a 1/4" lathe bit and stroke the slot end square using a
mill quill or lathe carriage feed.


Even if it is a blind slot you can rig a lathe bit as a broach. To do this
you need to cut a slot in a piece of rod to retain the tool bit. The idea
here is to restrain the tool bit in the rod so you can stroke the quill and
the cutting edge of the tool bit can nibble away with each stroke.

You lock the brake on the spindle tale a small cut, advance the table a few
thousands and stroke, advance, stroke, advance etc.

This goes pretty fast.

--

Roger Shoaf

About the time I had mastered getting the toothpaste back in the tube, then
they come up with this striped stuff.