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I sent 3 solid carbide bits to be sharpened. Two are Whiteside and the other Katana. Two are 1/4" and the other is 3/16" and they are chipping out on the very end. I know the tips are small and carbide is brittle but I don't think they should chip. The only thing I have done different is slow the router speed down to about 16,000 or 17,000 RPM. At 23,000 the router was screaming like it should but at a slower speed, I got good cuts and no signs of overheating. Do y'all have any idea what the problem is?