I have a small part I'm making, it's about .75" x 2" outside, 1018 steel.
I'm currently using a pocketing operation on the inside area -- the part in blue in the screenshot. With a .1875" 4 flute carbide EM, .015 DOC and 30 ipm it's taking like 15 minutes to clean this out. The interior is .537" by about 1.5 and I need to go .5" deep.
Waaaay too long for this part.
I'm going to try plunge roughing to speed this up, using a .5" carbide NC counterbore (essentially a flat bottom drill, no pilot).
Any recommendations on depth of cut, rpm and feed (plunge)?
At 400sfpm and .00275 CPT I get 3055 RPM at 33 IPM. Assuming a pecking operation at a .1 DOC, this would be under a minute to rough it, and maybe another 2 minutes to clean up the walls. Much better.
Anyone have some experience with this?