On 4 January 2016 at 10:40, Gene Heskett <[email protected]> wrote: > You said headstock gears? Backgears for spindle speed changing? 5/16" > wide for a lathe swinging a 13" chuck? In a job shop, that sounds lime > a recipe to keep LeBlond busy making replacements. That almost sounds > like a job for a new motor & inverter drive
I think the ideal combination is an inverter drive _and_ back gears. The desirable speed on a lathe spindle varies hugely, and the bigger the lathe is the more is varies. My Holbrook has a range from 80rpm to 3000rpm. That's a lot more than the useful range of an inverter drive. A 13" lathe would ideally run at no more than 50 rpm at the bottom end with a 13" workpiece. even with a modest 1500rpm top speed over-driving the motor to 100Hz you would be trying to run the motor at 3Hz at the low end. I don't think you would see much torque there. The Holbrook has a 9:1 Variator (which is a mechanical ratio device, so increases torque as speed decreases) and they still needed to fit a secondary 2-speed box to get the speed range. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
