- Joined
- Mar 19, 2011
- Messages
- 940
I'm starting a new thread, and throwing myself before the bus of the collective wisdom.
I have ground a new cutter, based on the discussion in the other thread. It works, after a fashion, but I know it can be better. I have attached a picture of a test turning. As you can see, the finish is not very good at all (and that may very well be operator error.) When I kept to a .010 DOC, I got nice long, very tight curls of swarf. I laid a ruler on the pile, to give you an idea of the scale.
Settings are: 434 RPM (the middle of the cone pulley) and .0074 feed. When I tried it at the high-speed pulley, I got lots of smoke and blue curls.
I have also attached pictures of the cutter. It's 5/16 HSS. The leading edge is ground at about a 15 degree angle. The tip is ground back at about the same. I can see no place that the bit is rubbing. The top is flat. The QCTP is at 90 degrees, and the bit is going straight in to the work.
If anyone can tell me where I've gone wrong, please do! You won't hurt my feelings.
If you would rather talk than type, I'm at two oh six, five two three, nine six two eight.
Thanks a heap,
Mike
View attachment 95388
I have ground a new cutter, based on the discussion in the other thread. It works, after a fashion, but I know it can be better. I have attached a picture of a test turning. As you can see, the finish is not very good at all (and that may very well be operator error.) When I kept to a .010 DOC, I got nice long, very tight curls of swarf. I laid a ruler on the pile, to give you an idea of the scale.
Settings are: 434 RPM (the middle of the cone pulley) and .0074 feed. When I tried it at the high-speed pulley, I got lots of smoke and blue curls.
I have also attached pictures of the cutter. It's 5/16 HSS. The leading edge is ground at about a 15 degree angle. The tip is ground back at about the same. I can see no place that the bit is rubbing. The top is flat. The QCTP is at 90 degrees, and the bit is going straight in to the work.
If anyone can tell me where I've gone wrong, please do! You won't hurt my feelings.
If you would rather talk than type, I'm at two oh six, five two three, nine six two eight.
Thanks a heap,
Mike
View attachment 95388