Ignoramus8184 wrote:
On 2010-11-26, wrote:
I would run about 60 surface feet per minute (sfm) and use either water
based coolant or a mister with coolant in it. You could run faster but
it will save the tool to run at 60 sfm. You could also use sulfur oil
and either mist or paint it on the cutter. The final decision of speed
comes from looking at the color of the chips and how much heat you are
generating, all revelent on the sharpness of the tool, the type of
coolant and the sfm of the cutter. To get the most life out of the tool
you want the chips to come off shiny with no discoloration and the
coolant not steaming from the heat.


John, thanks. I will try to hook up the rotary indexer to my CNC mill
tonight, so that I can do the entire job automatically without needing
to press the button on the indexer. The mill itself would
electronically "press the button".

If I do that, I do not particularly care of the job takes 10 minutes
or 30 minutes due to too conservative setting of the feed. I can just
start the job and go home to do something else. Plus, I have to worry
less about rigidity.

I would say, I will start at 80 RPM or so. at 3 inches diameter, it
gives me 62 FPM.

i


http://en.wikipedia.org/wiki/Surface_feet_per_minute
http://en.wikipedia.org/wiki/Speeds_and_feeds


John


forgot to tell you how to compute the feed rate.

RPM x the number of teeth on the cutter x load per tooth (.002 to
..004)= feed in inch per min.


John