GS_MiniMill_02

Mini mills come with two types of spindles, R8 and 3 Morse taper. The most common mini mill spindle in the US and Canadian market is R8 however some brands in both countries sell mini mills that have 3 Morse taper spindles. Countries other than the US and Canada most commonly have 3 Morse taper spindles.

Collets, 3 Morse Taper, Individual Sizes
Collet, R8, 1/2"

A Morse taper has a continuous taper from one end to the other.

An R8 has a straight section with a 16.85° cone taper at the end.