[Georgie]

I bet it has been asked a thousand times but here goes.
Mr Moderator, If I'm in the wrong area I don't mind tis being moved.

I'm attempting to cut some Aluminium sheet 12.5mm thick,
Some pockets will go right through up to 2" diameter. A profile around the plate will be approx. 9" x 4"
There will be a few 6mm slots.

My bench mills fastest speed is 2100rpm
If I use a 10mm 3 flute slot drill and cut at 0.5mm per pass , what speed should my table be running at in inches per minute to get best results.
I'll mist with white milky stuff from a spray bottle.
Is .25mm per pass too little ? What is the easiest grade of aluminium to cut?

George

[hub]

A starting point:
FSWizard - Free Advanced CNC Speed and Feed Calculator

Those calculated values might not be right for your machine, but good to start with.. as an estimate