Probotix

Good day, I don't know if this is the correct category, I apologize if is not. I am working on a machine that has a Parallel Port Breakout Board Model PBX2, and I want to control the spindle speed from the computer, does anyone knows which is the analog signal pinout from the breakout to do this?

Thanks

daxur666 wrote:

Good day, I don't know if this is the correct category, I apologize if is not. I am working on a machine that has a Parallel Port Breakout Board Model PBX2, and I want to control the spindle speed from the computer, does anyone knows which is the analog signal pinout from the breakout to do this?

Thanks

Is this what you are looking for: www.probotix.com/wiki/index.php/PBX-2

It does not seem to have one

I don't believe that a PBX-2 has an analog output, and a parallel port is only digital io.

You can use a PWM signal from a parallel port to create an analog output, but the PBX-2 doesn't have the hardware to make that conversion. (There are some parallel port breakouts that do.)

Do you think is possible to use an Arduino to solve the PWM issue?

Hi Freddy,

It's not often that i get a name like freddy with double d.
But i like it.

www.probotix.com/wiki/images/c/c5/PBX-2.pdf

I looked at your wiring diagram. On your a axis you can get the pwm..
It's pin 1 to do the pwm signal. It's called the Nstrobe. Try to isolate this.
But it can be a risk in the end. If the board is not designed for isolating pin 1, your output
voltage can be the problem. Then you have to order other interface card of approx. 4 dollar.
If your max output value is 5 volt, you can do a up-amp factor 2.
In worst case senerio, you can make your spindle drive 600hz and send 5 of 10 volt's. Then it's 300 Hz.
I would order a new break out board, if i was you. That would make sence.

Pwm signals are sometimes hard to monitor, it can be 10volt, then you have to invert it.

Here a short example of config :

in your hal be sure of this :


A impression of postgui.hal file how to :


Try to isolate your pin number 1. This is for parport application's the only pin that can be used so far i know.
Pwm parport pin.no.1. go alway's with a good - or ground to the frequentie drive to accieve your 10 volt. So check if you get 10 volt out max, and check if you get 5 voilt also with 50% rpm. If you are new to this procedure, one day in time is good !!

Thank you for your answer, can you recommend me a board that allow me to do the spindle speed control and connect the stepper motor drivers?

www.ebay.co.uk/itm/Mach3-CNC-Stepping-Mo...047675.c100005.m1851

Here is one BoB that can be used, there are many on the market.

Yes,

The board that Bengt has provided run's directly on this code, your spindle is working, even your rpm's. It's a gui for milling machine
up to 5 axis. You have to read the readme file carefully, then you find out how to change your parport adres in the grotius.hal file

github.com/michelwijnja/Linuxcnc_inox_doors

It's a very nice coded gui. I only have to do one update coming day's. It's not very important but i have to do that.
It's a gui with special option's you will see.

Good luck.