Gentlemen, my old little Steinel vertical mill, older than the Black Forest, has a MT3 (MK3 in German). Above this, the bore is drilled hollow 14 mm all the way through to the top of the machine. The collet holder (1 - 20mm) that came with it has M12 inside threads at the end and can be fastened by a 12 mm pulling bar, if necessary. I made all my other tool holders the same way.
An almost new large milling head that was given to me because it was said to rattle and to be instable. I decided that a MT3 holder was way too thin and too long for such a big head. So I figured out the outside taper angle at the lower end of the quill, some 60 mm thick, and turned a plate shaped holder fitting over the outside of the quill. It will be pulled up by a long bar just the same. You should see the old maid making chips with a big 8 blade cutting head in alu at high speed! Furthermore, this construction is rather short and gives me more height between the tool and the table. Consider unconventional methods, too. Peter > 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. > > --- Diese E-Mail wurde von Avast Antivirus-Software auf Viren geprüft. https://www.avast.com/antivirus ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
