The wrong size accessory. ACCESSORIES with shank size recommended in your instruction manual. I'm sad to report a blight is ravaging our native stands of American Beech here in the Midwest. Hi, This is my first posting to this site. High Speed Steel (HSS) Long Slot Mortise Router Bits are mainly suitable for use on: Slot Mortise Machine (Oscillation Mortiser Machine); Machining Centres. USE ONLY DRILL BITS, CUTTING TOOLS, OR OTHER. Mortiser Drill Bit Tool Set 【6 Different Slot Diameters】: 6 pieces square hole drill bits mortising machine or a mortising attachment; Fits all mortising. Meichoon 3 Pcs Mortise Chisel & Bits Woodworker Square Hole Drill Bits Mortising Slot diameter: 1/4 inches (mm), 3/8 inches Mortiser Drill Bit 1/4. . Keep chisel and drill bits The workpiece should be moved so that the slot in the chisel is releasing chips into the already 2 Bit protrusion of 1/16” is. Here's a link to an article by Jim McCormac. If ya wanna know details let me know. I thought I'd show (off) my slot mortiser.