Just a follow up to my Torx Bit Broach Thread.

[Frank S]

Very nice indeed. I was wondering if you concave ground the end of the torx bit to have a cutting edge but I see now that you didn't. if you had done so it might have helped in the broaching process and would have been needed on harder material such as steel. I used to make a lot of male JIC plugs out of 12L14 then broached a hex in them but my broaches were store bought cutters