Melamine RPM

[nat_wheatley]

RPM's for cuttig 3/4" melamine at 8 ips with a 2 flute mortise compression bit? At 6 ips, I've had very good results at 13K RPM, but I'm having a tough time dialing things in at the faster feed speed. Thanks.

[Gary Campbell]

Nat...
Using percentage rule of thumb, would mean if you increase move speed by 33% also increase rpm by 33%. This should keep chipload fairly consistant. Try 17.3K rpm as a starting point. (6/8 = 1.33 , 1.33* 13K = 17.3K)
Gary

[nat_wheatley]

Thanks Gary. I was wondering if it was directly proportional, and it sounds like it might be.

Not following that logic, and grasping for straws, I tried 14K and 14.5K, both with poor results. I'll try the 17.3K and would guess that will do it.

Thanks again,
Nat

[Gary Campbell]

Nat...
Make sure you try going both up and down until you can hear the "sweet spot". A double check with the mic will confirm.
Gary