> On Feb 22, 2018, at 12:27 PM, Chris Albertson <[email protected]> > wrote: > > Andy, > > That is what I'm making too. A rotating ball nut. I looked at all the > ways there are to lift the head of a Siege X2 mini mill and I think the > question comes down to the location of the screw. I think I will use the > space occupied by the factory installed column mounted rack. The screw > will be fixed to the head and lifted straight up by the rotating ball nut > I'm using a 16mm dil x 2mm pitch screw. All other designs place a > twisting force on the Z-axis dovetail > > This belt will connect to a nut that looks like yours. But I read the > belt literature and far and away the GT2 profiles seems best. They are > now calling it GT3 and say it interchanges with GT2 parts The belt teeth > are little semi circles.
The GT series all have effectively the same profile, just progressively better life / fatigue resistance. > > My question was about pitch. Should the belt pitch be 2mm, 3mm or 5mm. > Any pitch that provide at least 7 teeth on the motor sprocket is acceptable, from a torque transmission / belt life stand point. On the other hand, the larger the pitch the higher the peak torque you can transmit. I should think 3 mm is the right compromise. > So I look up technical data for the belts and each pitch has a minimum size > pulley and different maximum RPMs. Using 3mm pitch allows the motor to > spin up to 5,000 RPM. I doubt I will run the stepper motor that fast > >> N. Christopher Perry ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
