On 11/06/2014 03:06 PM, Marshland Engineering wrote: > A bit off topic but I would like to get this correct before I start. > > I have bought a ZAY7045 mill > http://czdm45.trustexporter.com/product/detail/286/533904.htm > > I have also bought > Ametek MCG DMC-6D Brush Type PWM Servo Drive Amplifier 6amp 80vdc > and > Ametek Nema23 PM Brushed DC Servo Motor w/ 5000 line Encoder 60vdc > from Ebay > > I'm probably going to buy these ball screws. Pitch 5 mm. > > http://www.aliexpress.com/item/Free-shipping-Rolled-1605-Ball-screws-L450-950-1000mm-C7-Anti-Backlash-Rolled-Ballscrew-3pcs-ballnut/1192542434.html > > My thoughts for a rapid are 10 m/min. This gives me a gear ratio of around 2:5 > > The motors are approx 400w Continuous and 60oz/inches. My brain is bit rusty > and there are so many incorrect formula on the web, I can't seem to get the > calcs correct to see if these are powerful enough. All my cals show very low > power levels.
Shooting from the hip, I would tend to go ahead and install the ballscrews, then mount a temporary pulley to a screw, wind a short rope on it, hang a weight on the rope, then see what motion you get. Add weight until you get what you want. You might consider adding a load to simulate cutting loads and/or heavy workpieces. The torque you need can be calculated with: torque = weight * pulley radius Then go shopping for motors and drivers, oops, too late :) Or, select a pulley ratio that provides the needed torque, and live with the rapid you wind up with. Just a thought. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
