Re: [CAD_CAM_EDM_DRO] PICstep Was: Interface. Gauging interest.

Dennis Schmitz wrote:

>
>And all steppers offer is reduced cost and high starting torque (which
>you can get from a DC servo if you really want it.) If you want
>precise motion, you still need feedback from the motor shaft and a
>controller that can microstep, so you're back into the cost range of a
>servo.
>
>

I don't believe you can can the same torque at very low rpm which a
stepper can provide, but then thats a matter of opinion. I should add
I am also an advocate of Servo's, and most of my larger machines have DC
servo's, but stepper have their advantages.

Oneday when Mariss, Steve.H and Art have the "unstallable stepper" thing
working, then we can compare it more closely ;-)

>So what's wrong with http://www.usbcnc.com/ ? Again, everything goes
>in the PIC code.
>
>
>

Hmm. Just looked at that. Very good effort, but 25Khz step frequency?
Mach can do that under Windows, through a Parallel port in it's sleep.
My VMC is running under Mach3 control at 35Khz. (over 200"/min on steppers)

Wayne....


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Wayne M Weedon Email: wayne@...
Fdos Design Poole UK
Tel +44-1202-677025 Fax +44-1202-770515 Mobile: 07774 439915

Specialists in small batch & Production Mechanical/Electrical Engineering
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