single cut is for soft material and will cut faster and grab the material, more for use on aluminum, double cut is for harder material and won grab as bad and also leaves a smoother surface on both iron and aluminum but alum will clog them up, I use WD40 while cutting alum.
Yep... plus I use both air and electric for doing
port work.. I have a reaostat that I can dial down
the rpm.. I use the WD-40 also... on my alum burrs/bits
I use wax also(if I have it.. keeps them from loading
up.. as to rpm.. dont know what it is... but you will
know when its cutting well.. dont over heat your burrs
or they will get dull in a blink.. spend the money on
quality burrs... I just bought 2 new ones the other day..
they were $22 each for the good ones from a abrasive compan
(the short shank ones).. my long shank ones range from
6" long to 12" long.. I only have 1 12" one
