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Its true they will last longer depending on how you use them. but, It’s better to buy end mills with bull noses rather then stone the edge just because you’ll never hand stone two edges equally or create the same cutter geometry behind them.
a friend is fairly adamant that the sharp cutting tips should be stoned back to a small radius to improve life. I have not heard of this before.
Does any one have a definitive answer
regards gill
end mill corners come with different radius or chamfer sizes. a finisher might have a .008" radius or have a sharp corner needed to finish mill a corner with a tighter radius.
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roughing mills often have bigger radius corners .020" or bigger is common. you can buy end mills with .030 or .060" radius edges or corners on a end mill. usually you order what you need or works best for the application
Then maybe it would ease your soul to know that manufacturers of milling cutters, and major makers of milling machines, both endorsed the practice well over 100 years ago. And as the laws of physics have not changed, the same mechanical principles apply today.Thanks very much I tend to put my faith in the manufacturer
Thanks very much I tend to put my faith in the manufacturer
regards M
Depends on what the friend means by stoning. If it is just rounding over the cutting edge to make the end dull it is now a dull tool. I break the edges on all the cutters I run by honing a 45 WITH clearance at least .001 wide. It will still cut a sharp corner for most purposes but last longer.
When I am done I want to see a line about .001 from the edge following the ground clearance of the new cutter.
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