Guys,
I have a billet of 4140 HR annealed that is 9" in dia and about 10" long. It is being made into a spindle. The flange 9" dia is about a 1.25" thick and the rest of the length gets cut down to 3" to 3.3" in dia. So, there is a lot of material to remove from the round billet.
Does anyone have a recommendation on how to get rid of this material quickly? I was going to process it on a 4 axis mill. I was thinking of using a 2" dia EM with inserts (from Ingersoll or Iscar) vs. using the cobalt 1" dia EMs that I have. I don't think that the cobalt tools would last a part.
Any ideas?