08-29-2013, 07:10 AM
After looking at many different versions of the tangential tool holder this is what I made.
The holder is 1" square CRS, the tool is 5/16", ground to a 30° point, roughed on the belt sander and finished on the disc sander, honed quickly on an arkansas stone. I did round the front edge slightly, but only on the arkansas stone, so it is very little. The tool is held at 16° angle to the front, but the tool is straight in line with the axis of the holder, I did not angle it to the right, as most that I have seen are.
The 1/4 -20 allen cap screw is counterbored flush on the left side, it pulls a "round nut" with a chamfer on it against the tool. The hole for the tool was drilled on the mill at a 16° angle and then filed square by hand. It took 45 minutes to file it square, to a snug fit. The hand filing was not a big deal to do at all.
I rabbetted the holder to fit into the QCTP. I tried it out on some 3/4" drill rod, it is good hard stuff. The cutter gave a good finish, the best was as a shear cut. I think as I use this tool, it needs a little more round on the point, and will do an even better job.
The deepest cut I took so far was .040", the tool was very rigid . It was an effortless cut on the SB13.
Here are some pictures. Thanks, Larry
The holder is 1" square CRS, the tool is 5/16", ground to a 30° point, roughed on the belt sander and finished on the disc sander, honed quickly on an arkansas stone. I did round the front edge slightly, but only on the arkansas stone, so it is very little. The tool is held at 16° angle to the front, but the tool is straight in line with the axis of the holder, I did not angle it to the right, as most that I have seen are.
The 1/4 -20 allen cap screw is counterbored flush on the left side, it pulls a "round nut" with a chamfer on it against the tool. The hole for the tool was drilled on the mill at a 16° angle and then filed square by hand. It took 45 minutes to file it square, to a snug fit. The hand filing was not a big deal to do at all.
I rabbetted the holder to fit into the QCTP. I tried it out on some 3/4" drill rod, it is good hard stuff. The cutter gave a good finish, the best was as a shear cut. I think as I use this tool, it needs a little more round on the point, and will do an even better job.
The deepest cut I took so far was .040", the tool was very rigid . It was an effortless cut on the SB13.
Here are some pictures. Thanks, Larry
LJP, proud to be a member of MetalworkingFun Forum since Aug 2013.