Re: [CAD_CAM_EDM_DRO] Re: Force through ball screw based on stepper motor torque??

Peter Reilley wrote:

> There is another factor that you must figure in, the force
> of your pull on the line. That force adds to the motor's
> torque and must be subtracted from your reading.
>
> For example, if your reading it 10 pounds and your
> hand is pulling 2 pounds then the force from the motor
> is 8 pounds. Use the 8 pounds and the pulley diameter
> to figure your torque.
>
> Since you already have another scale use it measure the
> amount of your pull. Using two scales, if they are accurate,
> should give you a good reading.
>

But then your hand will still be pulling some some force on the second
scale. Simply add more spring scales in series until the total mass of
the spring scales is sufficient that you no longer need to apply any
force with your hand.

:*)

Sir Newton may have more to say on the subject.

Dave K