Re: EMC Spindle control Help!

Addition info to help clarify things....

What I would like to do is use just two pins from my printer port...

I guess it would be something like this but not entirely sure...

One pin would set increase or decrease speed (hi - low)
The other pin would pulse hi low hi low etc etc to increase/decrease
speed
of motor depending how the first pin was set!
This would then drive a circuit to supply the variable voltages.

Hope the description above makes sense! ;-)

Regards
Steve.




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "paragon032003" <sme@p...>
wrote:

> Hello Group,
>
> How does EMC send Cutter spindle speed to the controllers?
> I.e. stepper = step/dir = 2 Pins from printer port.
>
> I have a variable motor controller board that is controlled by
> voltage.
> The input has 3 wires lets say A B C.
>
> Voltmeter Testing.
>
> A and C = 12V Steady
> A and B = Variable voltage 2.3 - 9.7 V Approx.
> B and C = Variable Voltage 2.3 - 9.7V Approx.
>
> When A + B carry low Volts, B + C are carrying high Volts and vice
> versa (I.E. they complement each other and are relative adding up

to

> the total of 12V)
>
> The Higher voltage across B and C = Faster Motor Speed
> The Higher voltage across A and B = Slower Motor Speed
>
> So when B and C are reading max voltage the voltage to the motor is
> approx. 190V.
>
> BTW this is off of a very old CNC machine.
>
> What I am going to need to-do is have these voltages controlled via
> EMC + a circuit to produce the above output voltages.
>
> Does anyone have any idea what is required or what this circuit is
> called.
>
> Congratulations on getting this far ... ;-)
>
> TIA
> Steve.