Look at the state of these two 1/4in bits (see upload). These are best-quality bits made long ago by Trend in the UK, and both were professionally sharpened in the past year. But today as always, I find they blacken up like no other bits I use (including Chinese). I think I must be doing something wrong with them. What is it? I use them almost exclusively to cut natural wood - mainly these days, adjustment slots in jigs. I run them at or close to the router's maximum speed. I plunge my cuts by sensible degrees. And yet ... There's the 'coffee grinder' effect of chips trapped in a narrow slot. Nasty smell of burning. Is that it, and is it actually unavoidable? Or is there some lick that I have been missing these past 30 years? Any advice gratefully received.
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