We are using a 3 axis CNC router in a variety of aluminum alloy sheets of different tempers and thickness'. (2024, 6061, 7075, "O", T3, T6, 0.016" to 0.250" thick)

The routing tool diameter is 5/16" (0.3125"), spindle speed 30,000 RPM.

We can stack the sheets up to 0.5" thick.

I am looking for reference to determine the optimal feed rate in regards to thickness of stack, type of alloy and temper, number and length of flutes and all the factors you all know about.

Can anyone help?

Regards,

Eric

I can only assume that at 30,000 RPM you are using a carbide tool. The rule of thumb is that the depth of cut should not exceed the cutter radius for full slotting. I would start your feedrate around .001" to .003" per tooth depending on your depth of cut, do not use more than a two flute cutter. Be very careful to make sure that the chips are getting out of the slot, use lots of coolant and if possible don't run faster than 15, 000 RPM. The SFM for a carbide tool in 6061 should not go over 1400.