Re: what's better?

--- In CAD_CAM_EDM_DRO@y..., "dakota8833" <dakota8833@b...> wrote:

> --- 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

well, I've test it and found out that I really need a 2:1 ratio to
increase torque, it will need 5000 mm/min rapids, and I have a 10mm
pitch ballscrew on it.
It would be ideal if I can keep 0.01mm accuracy using a 500ppr
encoder and a 2;1 ratio using RUTEX servo drives.
I have the servo drive and the motor and the ballscrew it can not
be changed, but the gear ratio.
software is desknc or deskncwin.

motor is running (i guess) direct connect at about 2000 rpm. max.