Re: [CAD_CAM_EDM_DRO] what's better?

afogassa wrote:

> Hi, all
>
> I'm getting ready to install a servo drive+ motor to my gantry,
> And I'm wondering if I should conect the servo to the shaft using a
> direct coupling or use a timing belt in a 2 to 1 ratio.
> Torque should be no problem in either configuration.
> What would be better?
>
>

It depends on the ratings of the motor. First, see if you can determine
the
available torque, and top speed at some voltage. If the motor has lots
of speed to spare, then you can use a belt reduction. If the top speed in
direct drive is close to the speed you want to achieve, then you CAN'T
use a reduction.

As for couplings, the belt is a pretty cheap way to connect the two.
Otherwise,
you need very good coaxial alignment of the motor and screw, and then a
helically-slotted coupler carved out of a single piece of aluminum. These
are a bit expensive. But, they don't produce backlash, as most other types
of couplings do.

Jon