Maxwell wrote:

I have also seen small rotary wire brushes (designed for a drill motor or
such) bearing mounted to turn at an angle, rotated by only the passing
blade, but scrubbing chips from the blade.

Thanks, That's an interesting idea and I'll look into it. It would also
add the benefit of removing any loading of the blade. The 6-8 pitch
blade doesn't load much but a few chips will stick here and there.

Tony