Re: Gearhead motors ? future drives ?

Dave,
I don't disagree at all but there are always tradeoffs. If you use
the 10X multiplier the G340 will fault if it the motor is off by
off by +/- 13 counts (10 X 13 = 130). Ask me how I know :) If you
derate the machine enough this doesn't matter. If you put on lower
resolution encoders the +/- 1 count servo dance can have an effect
on finish.

I'm hoping that I can use Mariss' un-stop-able stepper drive logic
to control the G320. The G100 should not care if it is a stepper or
servo as long as it get encoder pulses.

Roger
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@y...> wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "vrsculptor"

<vrsculptor@h...>

> wrote:
> > > Granted that some people might want more than 1,350 RPM on a

stepper,

> > > but in that range, power is fading.
> >
> > Dave,
> > Step direction servos (g320) with fine encoder resolution need a

whole

> > lot more pulses per second than a PC can supply to move a table

at 200-

> > 300 IPM. My retrofitted mills servos need 20K steps per inch. My

max

> > rate with Mach3 is currently around 120 IPM. Original spec was

200.

> >
> > There is a need for higher pulse rates.
> >
> > Roger
>
> I thought the step multiplier handled that problem ?
>
> if you have 20,000 steps per inch, and did a 10x, you would have

2,000

> steps per inch and I assume little difference in accuracy.
>
> Lower encoder resolution will also decrease the steps per inch.
>
> But, I agree that there is a need to fit in some of the blank spots
> and that is why new stuff is offered.
>
> but, I would submit that there is something you could do to keep

high

> accuracy and increase speed.
>
> A great thing about the newer stuff is that you don't have to futz

so

> much with selection encoder resolution and all that.
>
> Dave