in short bearings. in long, on and on. basically the dp bearings aren't as robust or designed to take the side load that a mill's are, the dp takes an axial load while the mills takes this plus a heavy radial load. There are other problems such as no drawbar so what ever you're holding the tooling with will tend to pop out. if you do some searches here and in the some of the metal working forums, there's lots on this topic


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