Single flutes are the way to go, It's not so much chip load but space to get the chips out the way so you are not recutting chips.

Couple of people on Ebay selling Trend single flute router cutters in carbide.

I use these on Tufnol which is very abrasive and they last a long time.


Never tried Roy's 5 amp drivers as I have a load of the 7.8 amp Chinese drivers. Was running bastard Gecko 201's but these Chinese drives outperform them easily, better rapids, cooler running but best off all they don't blow up on switch on now that Marriss has now kindly admitted to on the zone.