Hi Richard,
I have recently assisted a friend in uprating his Boxford CNC mill. We
used HSS 2Nm Servo Steppers and the results look great at the moment.
Feed rates now up to 2500mm/min and acceleration at 250mm/s/s. I may
discuss these units further at a later date.
Richard
Interesting about the servo steppers. I'm using DC Brushed Servos (or the Bergerda AC Servo) with a 3000 RPM constant torque rating of 1.6Nm and 3:1 reduction on the X axis. The Y has 4:1 because it's got to carry that extra weight from rotating X axis assembly. Peak Torque on the KL34-180-90 is 8Nm.
Anyway, with LinuxCNC and the MESA 7i92H allow me to move the X axis at 150 IPM (3810mm/min) and the Y at 120 IPM (3048mm/min) and they are incredibly quiet.
What sort of reduction did you use (if any)? What's the max RPM of the motors you used?
John Dammeyer
