RE: [CAD_CAM_EDM_DRO] stepper pulser, and RE: Stepper driver question (slightly O.T.)

HI Ron,

I'm sure something could be done that way. Not too much different from the
window controls in your car. Or one could always use a slide valve and a
hydraulic control! ;>)

I'm personally interested in "computer" solutions, motion control and a
little software. So THAT's what governs my suggestions/solutions!

Alan KM6VV

>
> Why not just use a mechanical DC motorized actuator with two limits. Some
> simple circuitry with the optical/photo sensors to trigger. Latch two
> relays through a stop NC limit both directions? Can't imagine a stepper
> holding something for 12 hours at a time. Just went way off topic..sorry
>
> Ron
>
> Alan Marconett <KM6VV@...> wrote:
> HI Dave, Marv,
>
> You're right! The 555 timer circuit posted in the files could ramp a
> stepper up. Add comparators, and you might have it.
>
> But just changing directions may not be enough. Some hysteresis may be
> required, so that the device does not "hunt". How wide would the "dead
> band" (area between limits where no motor activity is desired) be? I
> suppose if a "limit" (photo detector, what type?) was reached, one could
> simply move 1/2 the distance across the dead band.
>
> Contact Dave or I off list if you're interested in a PIC solution. Dave
> and
> I are currently working on a "stepper pulser" that runs a stepper with
> proper acceleration/deceleration in either direction when a switch or push
> button is actuated. Your project doesn't sound like a big leap from ours.
>
> A stepper driver would be required; an LMD18245 stepper driver would work,
> or you could order a single axis Xylotex board. The ELS board (ELS list)
> would be a candidate; it has a driver on board. Also has an LCD display,
> which may or may not be desired.
>
> Our stepper pulser board is smaller, and may be used with or without an
> LCD.
>
>
> Alan KM6VV