What's better?

Single cut carbides?

Double cut carbides?

Sanding rolls.

depends i like single for doing the timeing and taking a lot of materal off fast, and then go to double for when i port match for a smother cut.



but as far as porting the housings single is the best because the double get cloged very quickly with alumium.

Double cut for the irons and single cut for the rotor housings. Dont forget you will need sanding rolls for finishing.

What grit for the sanding rolls?

also are sanding drums better than stone grinding bits?

The stones suck in my experience. Put any arm into them and they break.



Sanding rolls take material away very quickly, hardly ever clog, never dull, and are easy to shape the tip against a smooth brick for the end that you want.



I use 80 grit for rough cutting, finishing, the works. Maybe if I have an incredible amount of aluminum to remove from a rotorhousing I will go for a carbide bit, but it's usually even faster to set it up in a mill or rough the port out with a mini recip saw. No joking!

I use double cut carbides for the irons, then 120 grit sanding rolls to smooth it all out.



Usually works damn good

after i port match with a double cut carbite, i use the drimal polshing wheels, they go from roughf (it can take a good amout of materal off) to medium to fine to super fine it come out pretty good.



http://i134.photobucket.com/albums/q111/kuhnke/s6tt.jpg