Stepper motor 101 was Re: Lini-stepper

> And the PIC makes an interesting and flexible way to drive it.
>
> But OK, not linear, but an approximation of a sine wave, similar to

micro

> stepping.
>
> Alan KM6VV
>

> > IME Linisteppers work fine in their "designed-for" applications...
> > IMO they're great for learning about--and messing with--
> > PIC "stepper" code, and while the heatsink and power supply
> > requirements are bigger than for chopper drives; they are still
> > inexpensive and user repair-able.
> >
> > ALSO, the Lini- is NOT linear stepping; but linear amperage/winding
>

This is where the polishing of the program and circuit needs to be
done.

Switch to FET's to lower heat. a no brainer.

Linear amperage does not equal linear steps, but then there has always
been the discussion of exactly where the step/armature is on a
microstep. is it exactly at 1/7th of a full step, or is the power
ramping between steps smoother that offers better power delivery ?
and it is 'somewhere' between 1/2 steps, but not exactly linear ?

Also, there is that how close is good enough bit. does a screw with
26,000 steps per inch suffer if the step if off by 1/10th of a step ?

Dave