07-02-2015, 04:23 PM
Ed,
It is indeed going to be PERFECT for your new machine. What we'll do is put together a little chart of RPM's to be at for various materials, you can just feed at whatever sounds good.
Mild steel <C0.25% 850
Alloy steels, annealed C 0.25 - 0.55% 700
Alloy steels, tempered C0.25 -0.55% 670
303 Stainless 400
316/321/347 stainless 340
416, 410, 4240, 430, 440 stainless, annealed 430
17-4PH, 15-5PH, 13-8PH, tempered 340
Aluminum, plastics, WFO!
Those are the cutting speeds (given as straight RPM for a 2-1/2" cutter) from the book at 75% the recommended rate, for tool life without rubbing them to death or burning them up. All are given for full cutter width of cut, can run those 25% faster at 1/2 cutter width or less. Feed rate per tooth shouldn't drop below .002" per tooth or you will wear them out from rubbing. Take RPM times feed per tooth, times 6 inserts to see feed in inches per minute.
Having a lead angle face mill, you will find yourself using it far more than the 2" shoulder mill. I see about 8-10x more use with mine than the F4041 2-1/2" shoulder mill I have, but still very happy to have that when it's really needed. When starting out it's usually a case of if you can only have one style it's best to go with the cutter that can do both, though the shoulder mill use more power for a given cut than the chip-thinning effect you get with a lead angle face mill.
I'll let you know when I have the inserts.
It is indeed going to be PERFECT for your new machine. What we'll do is put together a little chart of RPM's to be at for various materials, you can just feed at whatever sounds good.
Mild steel <C0.25% 850
Alloy steels, annealed C 0.25 - 0.55% 700
Alloy steels, tempered C0.25 -0.55% 670
303 Stainless 400
316/321/347 stainless 340
416, 410, 4240, 430, 440 stainless, annealed 430
17-4PH, 15-5PH, 13-8PH, tempered 340
Aluminum, plastics, WFO!
Those are the cutting speeds (given as straight RPM for a 2-1/2" cutter) from the book at 75% the recommended rate, for tool life without rubbing them to death or burning them up. All are given for full cutter width of cut, can run those 25% faster at 1/2 cutter width or less. Feed rate per tooth shouldn't drop below .002" per tooth or you will wear them out from rubbing. Take RPM times feed per tooth, times 6 inserts to see feed in inches per minute.
Having a lead angle face mill, you will find yourself using it far more than the 2" shoulder mill. I see about 8-10x more use with mine than the F4041 2-1/2" shoulder mill I have, but still very happy to have that when it's really needed. When starting out it's usually a case of if you can only have one style it's best to go with the cutter that can do both, though the shoulder mill use more power for a given cut than the chip-thinning effect you get with a lead angle face mill.
I'll let you know when I have the inserts.