So I popped over to a friends to borrow a carbide 3 cutter face mill. Alas the MORSE Taper draw bar fitting wouldn't work with my R8 to MT3 adaptor. But the more rounded cutters gave me the idea to use my green wheel on the carbide brazed cutter I was usingin the mid size fly cutter holder.
No difference really other than the cast aluminium tended to melt onto the tip more easily. I had clamped a failed casting into a large vise. Having seen my friends fly cutter bits (modified carbide inserts) I started thinking about the amount the 1/4" shank cutter protruded. I found a 5/16" HSS tool bit and touched up the tip. Then screwed it in place. Ultimately I ended up using a set screw (long story) but all I can say is Wow! http://www.autoartisans.com/mill/TestFlycut_1.jpg http://www.autoartisans.com/mill/TestFlycut_2.jpg Silky smooth. No light past a straight edge laid across it. With my eyes closed dragging fingernail across it I can't feel the pass transitions. Milling done by moving X axis. Last pass was 0.003" DOC, 390 RPM, 2.1 IPM. About 2"diameter fly cutter. Overlap about 0.2" between passes. So I suspect the 1/4" tool bit vibrated like heck as it grabbed and cut the work and that's what did much of the scratching on the retreating edge. John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
