Re: [CAD_CAM_EDM_DRO] Servo torque test question

Robert Allen & Marsha Camp wrote:

> Jon,
> Did you ever measure the amperage/voltage of your servos under different load/speed conditions? What is the max. volts you run
> your motors at? What is max. speed on your mill's x & y axes? Nice stuff on your web site!

I have a roughly 69 Volt power supply. The motors actually rarel exceed 45 V at the motor
terminals, as read on a DVM. A scope would read higher instantaneous peaks, of course.
I have had it run at up to 120 IPM, but right now I have it set for 105. The X and Y
motors have current limits set for about 5-6 Amps. The Z motor is not the best electrical
match for this setup, but it was a great physical fit, so I used it. It would really want a
larger driven pulley to get a greater than 4:1 belt reduction ratio, but it works OK with
the servo amps set up for 10 A limit. I rarely go over 30 IPM on the Z (quill) axis.
I did have a mistake (forgot to activate the tool length offset) and ended up drilling a
hole at 40 IPM! The drill ALMOST made it to the bottom of the hole before breaking,
too! So, I really don't like to see such high Z speeds, anyway.

For what I'm doing, and the age and condition of my machine, 120 IPM is plenty!

Thanks for the comments!

Jon