- Joined
- Mar 20, 2014
- Messages
- 440
Guys, please correct me if i'm wrong, but when figuring the RPM to use for a flycutter, I have always used: RPM = SFPM divided by the DIA X 3.82. (To find the diameter, I measure from the tip of cutting bit to center of flycutter body and multiply by 2) . This is the same formula you would use for drilling or turning on the lathe. How am I doing so far? I mostly machine steel so for say 80 to 100 max SFPM and a 2.5" flycutter, my RPMs are fairly slow. Whats making me question myself, is cause I just watched Joe Pie's latest u-tube video about setting a flycutter:
and at 8:00 mins. he starts cutting, and his 2.506" Dia.flycutter seems like it is FLYING!! I realize he is cutting aluminum, but thats a HSS bit in his flycutter, and I usually use a brazzed carbide bit in my flycutter. What am I missing here????? Thanks to all, JR49