RE: [CAD_CAM_EDM_DRO] Re: Microstepping - a genuine PRIMER

I am definitely interested in the results of the test.

Sounds like a major improvement on the G201. Certainly a hard trick as the
drive was already very impressive. Any word on how the high voltage versions
are coming along?? You have a few of us out here waiting for them.

Tim
[Denver, CO]

> Hi,
>
> There is no decrease in torque at all compared to a half-step drive,
> there is some compared to a full-step drive. None of that matters
> though.
>
> Everyone fixates on holding torque. The numbers seem impressive but
> they are at best a guide what the motor will really do.
>
> If you have a bolt that was rusted in its threads, it will have a
> very impressive "holding torque", but you would know the difference
> between it and a motor.
>
> What makes a motor diffrent from a rusty bolt is a motor develops
> torque while turning. This introduces the concept of power; power
> equals speed TIMES torque. Power is what gets thing done.
>
> A rusty bolt may have 10,000 oz-in of torque but it has ZERO power
> because it is not turning.
>
> Power can be expressed in horsepower or in Watts, it makes no
> difference. 1 HP is the ability provide 550 lb of thrust or lift
> while moving at 720 inches per second. This is also equal to 746
> Watts.
>
> A step motor's power output depends entirely on power supply voltage
> and motor inductance if the drive is clean. By that I mean the drive
> does not permit the motor to resonate. Resonance uses up torque
> vibrating the motor that instead could have been applied to the load.
>
> A gear ratio does not change power at all. It only changes the ratio
> of torque to speed.
>
> Since this seems to be an on and off again topic, I will run some
> dynomometer tests (as time allows) for size 23 and 34 motors and
> generate maximum shaft HP data versus power supply voltage for some
> of the more common motors out there. This will give a reference for
> what you can expect from these motors. Please let me know if anyone
> is interested. Right now I'm up to my ears in running off a bunch
> (2,000) of much improved G201s, (auto standby current, modular
> connector, common GND interface, 10A per phase option, etc).
>
> Mariss
> Geckodrive Inc.
>
> FAQ: http://www.ktmarketing.com/faq.html