Flycut8/5/2023 ![]() ![]() incorrect tool geometry (do some searches, somewhere here I've posted pics and diagrams for fly cutters ), incorrect speed and maybe not enough rigidity in either machine and/or fly cutter set up. When your mill won't go so slow, a you can use carbide which will work at higher speeds. As a guess maybe the dia is 4 or 5 inches? means the mill should be going no more than 50-80 rpm. Cutting speed for hss and cast iron is say 80 feet per minute. For everything, drilling, milling, lathe etc. I would doubt that mill will go slow enough for a tool steel (which i assume means HSS) cutter. I lap cast iron dry, seems to work better for me.Īlso some close-up pics of your cutter would be helpful. Once you resolve that issue if you still don't have the surface you desire you may try lapping the part on a hard flat surface with some 600 grit wet/dry paper. ![]() I bet the cutter is taking a bit more on one edge than it is on the other. All the visible tooling marks go the same direction. Thanks everyoneLooks like your machine may be slightly out of tram. I fed the work into the cutter really slow and took only a very light cut. ![]() I have a RF 45 Clone that I ran on the next speed up from slowest. The end result is better but its still pretty average and I could certainly not charge for that kind of job. I ground it with a bit of an angle on the face. I was using a face mill but I have just started using my fly cutter and some 3/8 tool steel. I am new to machining and I have just started flycutting some cylinder heads for my mini. ![]()
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