What Size Drill and Tap To Use?

[DaveH]

ml,
I think 2.2mm is a touch on the small size. Go with PixMan or if you want metric 3 or 3.5mm thread.

DaveH

[EdK]

(01-03-2013, 10:05 AM)ml_woy Wrote: The insert I am using is a TNMG-321
I.C. 3/8"
Thickness 1/8"
Radius: 1/64"

The top of my tool holder is 3/4" x 1.06" and I was planning on mounting two inserts back to back with a .125" wall in the center separating them. In that way I could use the tool to do inside and outside radius's.

Another forum member recommended the use of this fastener http://www.use-enco.com/CGI/INSRIT?PMAKA=250-1299

This may be a better option. I don't know for sure so take it for what it's worth.

http://www1.mscdirect.com/CGI/NNSRIT2?PM...=%EF%BF%BD

Ed

[f350ca]

I wouldn't worry about the screw too much. Your only taking light cuts as you form the ball. It takes very little to hold the insert under these conditions. Looks like I used a simple machine screw in the one I made, let it go when I sold the 14 x 40 as it wouldn't fit the replacement lathe.

[stevec]

We now see where you got the some of the design for your recent successful cutter grinder. Once again "hats off to you" ole bud.

[f350ca]

Thanks Steve.
Need to build another one but need something that fits on the compound or the QCTP. The compound now has a scale on it, not so easily removed.