Quote Originally Posted by Muzzer View Post
I get the feeling that 40 taper is the most readily available and cheapest for medium sized machines. 30 taper costs more due to less industrial usage.
I have fit a few ATC spindles with BT30 and ISO30 tapers and find they are the same or very similar price to 40 taper holders, but If I had a choice I'd go with 40 taper everytime.

On a Side note, the people I use for planning my large frames have a new machining centre with HSK100 and the size of the 100 Taper is huge.! I could fit my fist in the spindle nose..