----- Original Message ----- From: "Kirk Wallace" <[EMAIL PROTECTED]> To: "Enhanced Machine Controller (EMC)" <[email protected]> Sent: Wednesday, June 20, 2007 2:29 PM Subject: Re: [Emc-users] Hardinge HNC
> The tachometers are connected to the servo drive, so they will be > needed, if I decide to use these drives. Performance-wise, does anyone > have an opinion on whether to stick with the existing velocity amps > (which overall will cost more) or go with new torque-mode PWM amps? > I have a mill and a lathe that both use velocity mode amps with tach feedback. I had amps go bad on the mill, new Glentek amps were ~$900, I used AMC amps that I got for $335 brand new. They perform great and now my Mill doesn't have the audible PWM noise anymore. My mill has tachometers feed back to the drives and the linear encoders feed back to the control. This positions from the scales, getting rid of any positioning errors due to lead screw error or backlash. I like my setup but I'd prefer a brushless motor with an encoder or resolver feedback to the amp, and still use the linear encoder feedback to the control. Roger Neal ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
