Re: [CAD_CAM_EDM_DRO] Servo torque test question

Jon Elson wrote:

> Robert Allen & Marsha Camp wrote:
>
> > Hi all,
> > After having very little luck finding someone in this group
> > that has applied Gecko g320/340 drives to a mill the size of
> > mine I have decided to try and size servo motors that will
> > work on my mill. The question I have first is, can torque
> > required to run an axis be determined relatively accurately
> > with a string around a drum attached to the lead screw and a
> > spring scale pulling on the string at a fixed speed. I hope
> > this isn't too dumb a question but I wanted to double check.
>
> All this will determine is the dynamic friction in the screw and way.
> You have to add in force required to achieve maximum acceleration,
> and force required to achieve whatever tool feed force you think will
> be needed. I just pulled a number completely out of the air, 1000 Lbs
> of linear force, and then worked back to see how many amps I'd
> need to feed to the motor to get that. It was not real hard. This is
> for a standard Bridgeport machine.
>
> Jon
>

Did you put servos on a Bridgeport?
What size, or mfg. & model no.? What was the gear ratio?
Who's drive did you use?
Bob