Maximum bit diameter = .125" at size drawn - a larger bit will not fully cut all of the inside curves - which would cause interference between mating pieces There is no clearance between pieces in the drawing - some clearance must be incorporated in the tool path when cut - how much clearance is required depends on your tooling, material, size, machine characteristics, finish, desired fitment, etc... You also cannot use constant velocity because that would round off the sharp corners and cause gaps or interference between mating pieces.
