RE: [CAD_CAM_EDM_DRO] Re: Servo controllers for table top machines.

Hi,

I'm always a bit confused when I see magic numbers without the math behind
them.

So here are the conversions,

From http://www.zeroggraphics.com/Portfolio/Torque-Conversion-Chart.pdf

700 oz-in is the same as 3.64 ft-lbs

From http://en.wikipedia.org/wiki/Horsepower

HP = Torque (ft-lb) * RPM
---------------------
5252

So we have 3.64 * 500
---------- = 0.347HP
5252

Also from the same link,

1 HP is equivalent to 746W

Therefore 746W/HP * 0.347HP = 258W

John Dammeyer

> Subject: [CAD_CAM_EDM_DRO] Re: Servo controllers for table
> top machines.
>
>
> > I was under the impression I could just bolt on the brush type servo
> > motors directly to the ball screw end, similar to the way my stepper
> > motors are connected currently.
>
> No... You can't (unless you're looking to burn your brand-new
> servomotor down in 5 minutes or less).
>
> Rule #1: Servomotors are not step motors.
>
> --------------------------
> Typical NEMA-34 step motor: Develops 700 in-oz of torque out to 500
> RPM for a power output of 260 Watts. The motor gets too hot to touch
> (perfectly normal) at 7A and 80VDC.

>
> Mariss