Re: [CAD_CAM_EDM_DRO] What ratio to use for stepper motor drive?

Brian,

You have such a nice machine,
you should consider servo's instead of steppers.
Much better for your machine, high speeds, low speeds, all ok.

Bert

----- Original Message -----
From: "Bryan Mumford" <bryan@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Wednesday, April 26, 2000 4:30 AM
Subject: [CAD_CAM_EDM_DRO] What ratio to use for stepper motor drive?


> My home-built knee mill conversion uses toothed belts and pulleys to
> connect the stepper motors to the lead screws. I used the same
> diameter pulley on both motor and screw for a 1:1 ratio. My
> Compumotor controllers are configured for 1,000 steps per revolution,
> so I provide 5,000 steps per inch of travel for a resolution of .0002
> inches.
>
> I find that the motors lack power at higher feed rates and have begun
> to think that, if I put bigger pulleys on the motors, I will be able
> to travel the same distance with lower motor RPM and greater torque.
> I don't need that much resolution.
>
> Does anyone have experience that might suggest a better arrangement
> of motor to lead screw?
>
> Pictures:
> http://www.bmumford.com/cncmill/index.html
>
>
> Bryan Mumford
> Santa Barbara, California
> http://www.bmumford.com
>
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