Treepanning bit photo PLEASE

[garyphansen]

Could some one post a photo of what a treepanning bit should look like? I need to cut a 6" diameter hole in a steel plate in a lathe and I rather not drill and then bore it to size. Gary P. Hansen

[aostling]

Looks sort of like the lower jaw of a spawning salmon. http://www.jtsmach.com/jtswebshop/Pr...Tools/D327.asp

[Carld]

Well, there are a lot ways to make a trepanning tool. The cutter will be ground much like a grooving tool. That is it has a taper look to the top of it and the side clearance has to clear the diameter your cutting and it has to be able to clear the thickness of the work plus some. Do a google for beam hole cutter or trepanning tool and see what comes up.

Alan has it right since he is going to use a lathe. I edited my post to eliminate my incorrect reply.

[tattoomike68]

This tool is a face grooving tool for a diameter range but thats the geometry in an exaggerated form.

same idea..

[garyphansen]

Allen: ,Your link does not work for me. Gary P. Hansen

[garyphansen]

I looked up trepanning on google but mainly all I found was a bunch of information about people drilling holes in their heads. Sounds like good fun doesn't it! Gary P. Hansen

[Jim Caudill]

Here are some trepanning tools. The one on the left is a metod of trepanning in a mill or drill press. The other 3 are HSS bit, similar bit in a holder, and an inserted carbide bit holder. Hope this clears things up for you.

[ptjw7uk]

Trepanning in the head - a bit difficult to get the head in the lathe!!
LOL
Peter

[garyphansen]

" a bit difficult to get the head in the lathe!!"


Naw, just cut the head off, people who would drill a hole in their own head were not using their head anyway. Gary P. Hansen

[snowman]

Hey Jim...

Did you make the trepanning tool for the drill press that is shown? How well does it work?