How To Make A Flat Bottom Hole

[rleete]

(12-13-2012, 09:23 AM)EdK Wrote:

(12-13-2012, 08:46 AM)dallen Wrote: endmill

I'd be concerned that the end mill would grab the part and tear it out of the vise. The material is aluminum which gets kind of grumpy when trying to do a plunge cut like that. I'd probably end up snapping off the 1/4" end mill and not only ruin the end mill but the part and my day.

Ed

Drill it out (about 7/32" diameter), and get close to depth. The end mill is just for the finish cut. Much less wandering, grabbing and chattering. Of course, you need to peck it, just like drilling. Use WD-40 liberally as lube for better finish and less buildup on the mill.