Reply To: Milled holes undersized – any ideas?

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vicious1
Keymaster

Pretty big bit, typical is 1/8″ (3.17mm), Machine size and Z axis length play a large Part as well.

Those settning are what I use for a 24″ machine with a 4″ z axis and an 1/8″ bit. You might want to change it up a little, either slower cuts or shallower Depth of cut.