How To Counterbore?

[uncle harry]

Not a lot of experience myself, but why couldn't you use an end mill and cut the counter bore first an then drill your thru-hole. Wouldn't that make sure you were centered as long you didn't move the work piece. I'm sure there's something I'm missing, but that's how we learn. Thanks, Mike

If you drill first you can use a non-center cutting end mill and cut more quickly and with less power.

Edit: I replied before moving on. Sorry for the duplication.

 

[Andre]

If you're using a drill press, use the piloted counterbore. The endmill will just chatter and wobble around with most dill presses, creating a eccentric hole.

 

[4GSR]

One thing I forgot to mentioned. When you use a end mill to make a counterbore with. Especially one that is a little dull on the ends, lock your X-Y table locks on your mill. Things can get a little excited and the end results, well lets say it still worked. Ken

 

[T Bredehoft]

Andre above mentioned it, without a pilot you/we can't counter drill with a drill press. An end mill will only work in a milling machine. (or a lathe.)