Re: servo vs stepper

Yes, I have the Geckos set for 7 amps which is the rating for my
current motors' current. I have a 75 volt 16 amp powersupply that
is unregulated. I think the steps per inch is correct since I get
accurate distance travel. I have the rapid setting set at just
under 20 ipm since it stalls with higer settings and the acel and
decel parameters do not seem to help but when not correct causes
occasional stalling even at lower speeds.

Steve, thanks for the consideration
Keith Clark

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Stephen Wille Padnos
<spadnos@s...> wrote:

> What are the voltage ratings of both the stepper motors and the

power

> supply?
>
> You probably read this in the Gecko manual, but the power supply

voltage

> should be at least 20x the stepper's rated voltage. This is even

more

> important for motors with high inductance, since they are slower

to

> allow current to flow. The method of overdriving them is to get a
> quicker increase in current. As you try to step quicker, the

phase

> currents need to change more quickly, so a higher voltage is

necessary.

> (sorry if this is all review for you :)
>
> Since you have a hardware step generator, maybe you need to look

at

> software settings. Do you have the steps/inch set correctly?
> (remembering that the G201 is a microstepping drive, and requires

10

> steps inputs per full step of the motor) Do you have the maximum

speed

> set correctly? Is the acceleration set high enough for the

machine to

> reach full speed within its travel range?
>
> See if any of that helps (or if it's even new information)
> - Steve
>
> Keith Clark wrote:
>
> >Bob,
> >
> >Mine is a Series I. I will check out the compumotor drives.

Maybe I

> >will never get to 100 ipm but 20 sure is pittiful. I have set

the

> >Geckos to maximum power and have a healthy power supply. It

looks

> >like from the power speed graphs that the motor just needs more
> >juice. I am trying to investigate the pulse generator question.

I

> >have not found a software to test. My motion board connects to

the

> >serial port. I am not sure what software to look at. The one I

have

> >is quite expensive meant for professional shops so it ought to

work.

> >
> >Keith
> >