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| Bogstandard:
It just might be that Wong. You are not getting the correct edge shape presented to the work. I do in fact use the back cutting face as well. If I see my tram is slightly out, I use that to my advantage, as the return cut (without putting any further cut on) can just take 'wisps' of material off, and that is what gives you the mirror finish. I will run my fly cutter fairly fast, well above 500 RPM most times, but at a very slow feed. Plus lubrication always works well, especially with ali, as that is liable to pick up on the cutter and swipe it across your nice mirror finish, I use WD40 for lube on ali, brass or phos bronze and cast iron doesn't need it, and for normal steels (I wouldn't recommend a fly cutter on really tough stuff) I just use normal water based coolant/oil mixture from a squeezy bottle. Basically, to obtain a very nice finish, you have to attempt to keep the removed material from being carried around to the next cut, so by using a lube, the fine swarf is thrown away by the liquid being thrown around by the cutter, the ones that require no lube, automatically eject from the surface by themselves. Bogs |
| wongster:
Thanks Bogs. I'll redo the grinding. Regards, Wong |
| Xldevil:
Hello. I did my first free hand fly cutter grinding today.Btw.,my first tool grinding ever. I followed the "Bogs way" and after "only" 3 hours of intensive grinding, I succeeded :nrocks: Then I tried the cutter on a piece of aluminum.The surface looks smooth and shiny. Thank you, Bogs. Ralph |
| luke_duke:
Sorry for picking up the old thread. I tried to grind one myself and tested it out. The result is really awful. I guess I missed something with the angles. In the drawing No.3 there is a angle of 10-15 degrees. But when i look at the last picture I can't see any angle. Could someone explain to me how the second angle is grinded? I spent a few hours figuring out how to do so. Thanks in advance! Luke |
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