We are the typical job shop, super high mix low volume, machine just about every material you can imagine. So naturally we have just about every type of holder under the sun, with the exception of no shrink fit. Hydraulic chucks we have found great for tight tol finish work, but have had pull out issues when roughing, ER are sufficient for anything semi loose tolerance (+/-.001 or more), Side lock kind of a go to for roughing, however to date the absolute best milling chucks we have come across are the emerge FPC holders. Pricey but not much different than hydraulic prices. Interchangeable collets, no special fixtures for swapping tools or collets out, they have basically zero runout and have never had a tool pull, additionally we get 3-5X tool life over a sidelock or ER collet. The difference it has made on some of our more troublesome jobs has been stellar. If we were not constantly swapping tools and collets i'd probably go shrink fit but for us right now it doesn't make sense. Also emuge support is pretty nice to have for optimization, they know what they are doing over there.
Thank you my friend, that was incredibly helpful! Over the last few days of research and talking with application engineers, I've decided to use milling chucks for all of our roughing (likely the Hi-Power Milling Chuck from Big Daishowa) and hydraulic toolholders for all of our finishing or long-reach applications (likely a few products from ETP).
I had never heard of the FPC product, but I'm going to contact Emuge and see what they offer. It seems like a good alternative to the Diashowa product for roughing operations. My only concern is that it requires tools with a Weldon flat, whereas hydraulic toolholders almost always forbid this. Thus I would need to control which tools go where. When it comes to students using things, the less variation I can have the better. But still, I'll see what Emuge says.