Re: CNC on the Cheap** revisited**

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "dadcolisch" <dadcolisch@...>
wrote:

>
> Hi;
> I thought I'd touch base about my cheapskate CNC toy I'm workin' on.
> (see post #85589).
> On the "command vue 111" that I originaly wrote here about, I'm sure
> I've got the circut figured out. I traced the motor input traces
> back to (thru) a small driver chip:SK #SDH 02 I've got the pinouts
> figured out, the thing I lack (among many things) is knowing
> how/where to introudce a 2 wire output (step/dir from my PC-running
> Mach #2 mill) into a 4 wire input(at the drive chip). I realize that
> the SK chip is a DRIVER not a controler. When I try to trace the
> signal inputs to the chip, it all gets too confusing real fast. I'm
> thinking I could rig up a simple circut to provide 4 wire input to
> the driver and I'm home. Any feedback or suggestions?
> A second unit is a similar story: dot Matrix printer, this one is
> larger& has bigger motors. I forgot to take note of the Mfg. before
> throwing all the plastic away. The driver on this one is SLA 7024M,
> which I've had luck with before, using a Basic Stamp. I've actualy
> scratched out the traces leading to the chip's input signals &
> soldered wires in place. (still- 4 wire input req'd. only two from
> Mach 2!!!)
> One last thing(sorry to be so ling winded): I intend to keep
> everything in its original config. EXCEPT the 4 wire signal to the
> SLA 7024 chip, so the power supply, ref voltages, & other "stuff"
> (technical jargon)will remain active. Do you'all see any probs with
> this arrangement??
> Thanks in advance!
> Richard.
> PS: I'm really getting into this Hackin'/reverse engineerin'/Mad
> Scientist thing! Just need more data.
>

I'm assuuming all you need to do is take that step and dir thing, and
change them into a 4 wire sequential pulse output ?

pretty easy.

google k-158 stepper

you will find kits-r-us unipolar steppper driver kit with schematic.

that is all you need for the interface.

Dave