Tangential Toolholder

[Hawkeye]

I use my tangential toolholder on the 9" lathe so much that I had to make one to fit the big Storebro lathe. It was already on the list, but Arbelist happened to post a few pics of his on my thread on a Centre Gauge. Very similar to what I had in mind. Really good timing. I borrowed a couple of ideas from him.

I opted for a 5/16" HSS cutter, so I used a 1/4" endmill to cut the groove. It's set at 12* left and 12* forward. When I first got into this hobby, I assumed that if you wanted a 5/16" groove, you would use a 5/16" endmill. If you do, you get a sloppy, oversized groove as the bit pulls off to one side. By cutting a narrower groove down the middle and then cutting to the line on each side, you get a truer groove with more control.
   

A perfect slip fit.
   

When I made the first tangential, I also made a fixture to grind the cutter to the required 30* angle.
   

A double counterbore to make room for the clamp. I copied Arbelist's clamp - works very well.
   
   

You can see the 12 x 12 angles on the cutter.
   

The other idea I borrowed from Arbelist was to blast the holder with crushed glass. Gives it a nice finish.
   

Tangential toolholders do a great job in both turning and facing operations.