Could some please tell me what rpm I should run when routing 40mm laminate worktop? Using Freud 1/2" , at full rpm it destroys cutters in no time- Ive seen sparks, I gues from bits of screws and **** that s in the chipboard. I'm guessing the low end loses cut quality. Should I buy new cutter for every job? Is sharpenning worthwhile? i have plenty of blunt ones! Never been really happy with my mitres- any tips/rcomendations gratefully received.