I find it very difficult to single point a wood "screw".

What does work well is to mount a router on the toolpost and
user that to cut the threads. A 60% v bit in the router, and a slow
back gear works well. If you want some other tread form then
the proper router bit may be harder to find.

Single point inside works better.

Tom Gardner wrote:

Try http://www.bealltool.com/

"bob" wrote in message
oups.com...
I want to make a wood screw for a vise(2in. dia). I have tried using
dried and green oak and 3 tpi. The threads for the nut cut very nicely
but the outside threads are a mess. Lots of chipping and tearing. Is it
the wood, the tool grind ,or me? I have also tried cherry and it was
worse than oak. My brother ground the tool for the inside threads and I
ground the tool for outside and am a relative clutz so I hope it is
just the grind.
Anyone with experience doing this?
Thanks,
Bob