On 10/30/2015 07:56 AM, andy pugh wrote: > On 30 October 2015 at 03:09, Jon Elson <el...@pico-systems.com> wrote: > >> MT3 is a "self holding taper". So, if a clean, burr-free >> holder is driven into a clean, burr-free socket, it should >> resist normal machining forces with NO drawbar, vacuum or >> other tricks. > Yes, for axial loading such as drilling. There is no doubt that they > work perfectly for this in millions of lathe tailstocks and drill > presses. > > But I think asking one to work for milling (unless you always make > sure you do a nice hard plunge cut at the beginning) sounds like one > of those things that will be perfectly OK most of the time, but then > won't be. > Every Morse taper milling machine I have seen has a draw bar or a keeper key to hold the arbor. My HBM has a #5 MT and will loose the tool holder if I do not put in the keeper.
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