Re: what's better?

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:

> 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.
>

I drive direct because of the high speeds I need. If torque is no
problem and speed is important then don't reduce.Quality couplers are
cheaper than a belt reduction asmy. What is your ratio direct coupled
? What is the encoder counts per inch of travel. What controller
software are you using and can it keep up at high speeds. I plan on
increasing torque on my router though belt and pully. Rather than
increasing lead screw pitch ( there is a limit on how many rpms you
can turn a long unsuported screw ). Also with reduction encoder counts
go up ,.. can the controller software handle it or will you need to
change encoders.

Let us know

Frank