Re: Gecko servos

--- In CAD_CAM_EDM_DRO@egroups.com, "Tim Goldstein" <timg@k...> wrote:

> > > Ok Guys!
> > with a 400 slots encoder and my 5tpi screws and no reduction on

the

> > transmission it would give me 0.0005" ressolution right?
> > Is there a way to multiply the encoders couts?let's say x4,that
> > would give me a much better resolution.
> > I don't like the idea of using a belt reduction,to increase
> > resolution,since it might intruduce backlash.(I've zerobacklash
> > screws).
>
> If we are talking about using them with the Geckodrive servo

drivers your

> resolution would be .000125". The drive reads the encoders in 4X

mode so you

> get 1600 counts per revolution not 400. So, you will have 8,000

counts per

> inch (400 x 4 = 1600/revolution x 5 turns per inch).
>
> I don't think you need to be afraid of backlash from a belt drive.

That is

> one of the reasons they are used is for a zero backlash connection.

There

> are advantages to a belt drive in that it will give you more torque

in

> addition to increasing your resolution.
>
> I have been meaning to ask Mariss if it is possible to have a

setting on the

> drives to allow you to choose between 1X, 2X, and 4X quadriture

mode. That

> would allow a much greater range of encoders.
>
> Tim
> [Denver, CO]

Tim, Did you get the motors from goldmine? can you give me some specs
on it?(oz/in?)
So,400 or 500 slots that is! I think a 486 50 or a P100 can handle
it.I'm using a 486 50 and can get up to 100"/min on 1/2 step.Don't
think I'll drive it at more than 50"/min. anyway.(machine travel to
short 9"x4".)