Newbie- Al6061 machining question

[JayH1119]

Everything I'm reading about milling Al6061 says to max out my spindle speed and gives me a feed per tooth number. My spindle maxes out at 40k and there is no way the feed will be able to keep up with the numbers being calculated.

I'm guessing that I should lower my spindle speed until my machine's feed can keep up with the calculated number so that the tool is cutting and not rubbing? Any feedback would be appreciated.

Thanks.

[cam1]

Hi:

So, pick a feed that you feel comfortable with, and re-arrange the equation to solve for Spindle RPM...
The basic equation to calculate feedrate is:

Feedrate(inch /min)= (Feed/tooth X number of teeth/rev) X RPM

or RPM = Feedrate/(Feed/tooth X number of teeth/rev)

There are many variables that will effect the amount of material you can remove (machine condition, coolant, tool, part geometry, cutter geometry)

Start slow, and incrementally increase the feeds and speeds, until you are happy with the cycle times and finished part dimensions/surface finish.

regards