Quote Originally Posted by m_c View Post
You may find it's quicker to use some form of full depth helical cutting (my mind has gone completely blank on the proper name for this style of machining!), however whether that is an option depends on what CAM you're using.

Using that alleviates the common issues of slotting, which are chip clearance, and the cutter resonating/chattering in the slot due to no clearance.
I forget what it's called too. It's something to do with 'Adaptive' in the cam. However, you use a smaller tool than the slot itself. For a 3-6mm slot it's prob not a viable option. It's used more for wider slots.