Hacking a Roland CAMM3 PNC-3000

[Robin Hewitt]

Does this help?

[chivasmaniac12]

Does this help?

Hi Robin, I have a Roland PNC-3000 machine, and I am working on trouble shooting some issues with it. Currently, the motor PCB is not receiving the necessary 12V supply voltage. When I supply the 12V using an external supply, the motor can be switched on, but I have been unable to figure out why the motor PCB isn't getting 12V. Another issue I am having is the spindle speed display is not working. Could you please send me a picture of the relevant circuit diagrams? Are the manuals and circuit diagrams available online somewhere?

[Robin Hewitt]

This is the PSU, the rest would need some considerable finding and sorting out.

The spindle speed starts with a reflective sensor looking up at the bottom of the front pulley and connects to the PCB behind the speed control knob and to a rather primitive bar graph on the display panel.

[chivasmaniac12]

Thank you for the PSU schematic that is very helpful! I will start with verifying the PSU is working properly and work from there.

[mitarashidango]

I got a junk PNC-3000. While researching how to use it, I noticed something wrong with the z-axis DRO.

The value only increases when I raise or lower the z-axis.

I need a schematic for repair. And I want to know how to use it, so can you share the manual and other documents?

Best regards

[Doddy]

mitarashidango

I'll assume the DRO is a quadrature encoder - you'll get two outputs typically labelled "A" and "B". With quadrature encoding one of those signals is considered a "clock" (a pulse indicates travel), and the other indicates the direction of travel. It sounds like one of the outputs has failed (wire snapped, etc?), and it's just counting the clocks regardless of direction of travel. In theory you can test the quadrature outputs, assuming they're driven high/low with something as simple as a multimeter - each output will toggle high/low at the resolution of the DRO - you won't be able to (easier) test each discrete step, but you can check that some movement toggles the status easily enough. Be aware that you want the DRO in circuit to allow any decoder pull-ups to operate.

[magicniner]

I'd be more inclined to retro-fit with a stand-alone controller with integral display and keypad which takes ISO G-Code.

[mitarashidango]

Doddy

I will disassemble it later.
Does PNC-3000 use quadrature encoder?
If so, it would be easy to fix.

magicniner

That would be nice, but I want to run it without modifications first.
If it's too difficult, I'll use raspberry pi or arduino to run it.
I want to use it to make parts for machine.Maybe even make a model.I might even make a model.
Maybe I will make a model someday.

I think the PNC-3000 hardware is good and will be converted to CNC for use. Even if it cannot be fixed.

[magicniner]

Seriously, bypass the arduino/pi business, the cut down G-Code instruction set is a right hash-up and results in something you think is fine but that anyone with a decent controller wouldn't even consider.

[mitarashidango]

Seriously, bypass the arduino/pi business, the cut down G-Code instruction set is a right hash-up and results in something you think is fine but that anyone with a decent controller wouldn't even consider.

Ok, I'll do the conversion with a decent controller.