Yes, you should mill slots with a slightly smaller cutter and cut slightly undersize. Then cut to the finished dimensions. That way during the finish pass only one side of the cutter is touching the work. Chips should be removed before the finish pass.
Some people make one or two 'spring passes' after the finish pass, without changing the cut dimensions. Speed up the spindle a bit and/or slow the feed rate a little so the cuts per unit of distance are different and it'll nip off any slightly high spots as well as allow the tool and work to cut completely straight. The light load removes any deflection or 'spring' from the tool. On a lathe a piece can be cut to the correct dimension but the tool can still cut a small amount when making more passes without further advancing the tool. Slowing the feed rate and increasing the spindle speed on a spring pass can produce a smoother finish that still measures the correct dimension. But don't do it too much or the piece may end up too small. I've done that, though it's not as much of an issue with bigger, stiffer machines. On Thursday, December 1, 2022 at 02:08:31 AM MST, Nicklas SB Karlsson <n...@nksb.eu> wrote: tor 2022-12-01 klockan 08:18 +0000 skrev Gregg Eshelman via Emc-users: > Flood coolant, air blowing, or vacuum. Or pre-drill a bunch of holes > to almost finished depth to remove the majority of the waste before > milling. Got that. Then the only question left is if using a mill at least slightly smaller than slot then cutting a deep slot is a good idea. _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
