Grits
I'll agree with toastydeath except the 3/4 shank part, the one I built the bits are 90 degrees like the smallshops drawing. I have not had the need to use two bits other than one of them I insert upside down for balance purposes. I have run mine as fast as 2400 rpm, no vibration what so ever,taking.050 cuts on aluminum, normally I turn it about 800 rpm, finish cut of about .002 to .010 and it leaves a mirror finish. Just be careful of the large dia.Anything on the table,shop towels,tools,lexan guards ect that come into contact with it will be eaten and thrown across the shop if your lucky enough that it misses you on the way by. When I get my set up done I set the table feed and stand back,It will throw chips twenty plus feet.Like I said previously, compare it to running a lawn mower without the deck.A lot of difference between a one eighth inch end mill cutter and a 8 to 10 inch one.