Re: [CAD_CAM_EDM_DRO] Servo torque test question

Jon,
This is great info and helps my servo project along greatly, thank you.
Do the servo amps limit to no more than the set point or is it a continuous average, and if so what is the peak amperage?
Are you using 5 tpi lead screws?
What size timing belts are you using?
Bob

Jon Elson wrote:

> 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