I actually want to machine it on my mill as it's a learning exercise for me. And it's just one of these I need to do. (It's a cover for my file-server (which started life as a car-MP3 player project)
here ).
The straight-flute EM I have is a Melin brand (McMaster). Good thought on the plunge -- I need to check if it's center-cutting or not. And I can drill first, then mill the circles, or just drill the round holes to size. Still curious about the step drill though.
Even center cutting EM's will cut deeper around the diameter and the little circle cutout will turn with EM and cause alot of pressure without the relief cut. |
That's interesting, and I can totally believe this. Another thought is to use a 0.375" drill-mill, which I should have one of around here somewhere. But not sure if it will want to pull up as much as a regular drill, or less, or perhaps more?
I'm going to see if I can find my step drill and perhaps experiment with it.
Cheers,
-Neil.