CNC Routing Nylon 6 Material

[Jonathan]

I've cut a significant amount of nylon using a 6mm single flute cutter at 3mm depth per pass and 1700mm/min, 12500rpm without air cooling. With a 2 flute cutter your feedrate would need to be about twice that, but that would probably be too much force on the cutter so reduce the depth of cut.

It sounds like you're putting too much force on the cutter, so since the cutting speed for nylon is about 170m/min I would reduce the depth of cut to 1mm and use 9000rpm. If the cutter still breaks then reduce then you can either reduce the depth per pass further, or the feedrate and spindle speed proportionately. Similarly if the cutter survives you can try increasing the depth of pass until you find the limit. You would be much better off using 6mm single flute cutters as for such a large thickness it helps if there is more space for the swarf to eject.

I would be wary of using coolant since nylon absorbs water.