Re: [CAD_CAM_EDM_DRO] Re: PWM for spindle speed

Hi Dave,
You are probably thinking of the charge-pump signal. It will output a steady
12.5kHz signal whenever Mach3 is running. If you're breakout board supports
it then use it, it's a good safety but is not mandatory for Mach3 to run
(although you're breakout board may need it) and it can be turned off to
free an extra output. (It's actually turned off by default, I beleive)

Now when you mentioned it I seem to remember something about a 'weak' output
or something but can't recall which pin it's supposed to be. Just try one,
I'm pretty sure you won't run in to any problems.

/Henrik Olsson.

For reference, here's my complete pinout which works nicely:

Pin1 (Output) - ChargePump.

Pin2 (Output) - X-Dir

Pin3 (Output) - X-Step

Pin4 (Output) - Y-Dir

Pin5 (Output) - Y-Step

Pin6 (Output) - Z-Dir

Pin7 (Output) - Z-Step

Pin8 (Output) - Auxillary Output 1 (Flood)

Pin9 (Output) - Auxillary Output 2 (Mist)

Pin10 (Input) - X, Y, Z - Home (Prox switches via diodes, active high)

Pin11 (Input) - MPG Channel A

Pin12 (Input) - MPG Channel B

Pin13 (Input) - E-Stop (Ext E-stop pressed, active high)

Pin14 (Output) - Spindle Speed Step.

Pin15 (Input) - Available for future use. (Probe perhaps)

Pin16 (Output) - Spindle Dir.

Pin17 (Output) - Spindle On/Off. (Aux Output 3).

----- Original Message -----
From: "turbulatordude" <dave_mucha@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, November 01, 2006 9:09 PM
Subject: [CAD_CAM_EDM_DRO] Re: PWM for spindle speed


> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Henrik Olsson"
> <henrik-olsson@...> wrote:
>>
>> Hi Dave,
>> Any of the outputs you've got left will do. I use step/dir for the
> spindle
>> and have the step pulse on pin 14 - works good and shouldn't make any
>> difference with PWM.
>>
>> /Henrik Olsson.
>
> Thanks,
>
> I seem to remember that there was one pin with a pulse out to tell the
> breakout board that the software was in control of the port. so, that
> would be already used.
>
> And since 2 thru 9 are also used, that means there are only a few left.
>
> and, I seem to recall some long time ago that there was on pin that
> was somehow less than ideal for a pulse train.
>
> Dave