Hi,
last night, I had to mill a 1/2" notch in a chunk of steel. Normally, being of a "Tim the Tool Man" mentality, I'd just grab my 3/4" end mill; the biggest my little China 3 in 1 is spec'd for. But, I've been thinking (for lack of actual experience) and it occurred to me that a smaller end mill would have less distance between the flutes and thus, with a higher RPM, more cutting edges per second for the same surface speed. So I used a 1/2" end mill and it worked significantly better than I'd have gotten with my trusty 3/4". It just cut plain faster.
So, my questions to the knowledgeable are:
1) was this just a fluke of using a marginal machine?2) or, is there some rule of thumb for how large an end mill to use when it's size is not determined by some internal cut? You know, like: "minimum
3 teeth in contact with the work" for a saw blade.Is bigger really better?
David...