If the cutter is a centre cutting type I would chain drill it. As a cutter that small is stronger radially than axially.

You also are not going round re cutting chips.

I would step all the way round 1mm then when you are done step 0.5mm then step 1mm again to cut out the webs.

You have then removed 90% of the waste and can then finish the slot.

For chip load 0.01 per tooth max.

But someone of your experience I thought you would have known this. Lol

Phil

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