Froneck
Titanium
- Joined
- Dec 4, 2010
- Location
- McClure, PA 17059
I have been modifying New made in USA drills for my customer for some time, have ground Hundreds of them. Those above 1/2" as in this case 5/8" I re-ground the points but have to reduce the shank to 1/2" to fit most drill chucks. In the past I had no problem but this batch the heat treat is not quite right. I have been using AR8 in C-2 but it'd not hard enough. Called MSC and C-5 made in USA was recommended, I asked about C-6 but was told they have only Chinese, ordered them too. Chinese were junk so I tried C-5 but they too had trouble cutting but I did manage to get a few done. Ordered K21 Kennametal, tried it but I think this drll is harder yet. The older versions the shank got hard after about 1-1/4" of a 1-1/2" long cut, Some of these are hard on the end for about 1/4" get softer for 1" then harder again. Though the soft is not very soft, now that the K21 arrived the first one was only softer in about the middle of the 1-1/2" long cut for about 1/4" Anyone know of harder carbide available. I see McMaster Carr has diamond tipped tool bits, might they work? I never used diamond tool bits. Lathe is not a toy, P&W 16" Model C square head in excellent condition with CA toolpost.