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Messages - Pee-shu Mach

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General Mach Discussion / Re: Converting from ncstudio
« on: June 08, 2016, 10:48:16 PM »
I'm slogging through this myself, and I'll just add that, from your Fuling manual (p. 48), I take it that the 3 wires create an octal code (8 unique patterns from 3 binary digits: 000, 001, 010, 011, 100, 101, 110, 111--for the benefit of non-digitaling readers), and the pattern received from NCStudio, via its special super whiz-bang PC adapter card and the 15-pin interface, will select the matching pre-programmed speed.

But that's a Big point to be made.  When you and I get our CNC machine with the Fuling (a-ding) inverter/variable-freq-drive (VFD) from over there, some one has not just Wired it all up, but they have Programmed the Fuling-thing to expect and interpret the signals on the pins.

I believe (cf. p. 50-ff) that the Fuling fingus can also be programmed to control the speed of the spindle proportional to an analog dc voltage in the range of 0-10V, or even some subset of that range.

And Be-Yond! there appear to be even more modal modes of modalities...

Mach3--which I have not yet laid eyes or hands on--may even be able to (I wouldn't be surprised) turn a speed command in G-code into three signals to be output on three wires--but of course the problem is that there just aren't enough wires in a parallel port to 'commodate doing it that way.

I suspect that THAT is what that "PWM" pin I saw on the parallel-port breakout board is for: a "pulse-width modulated" (train of square voltage pulses which communicate low speed for narrow pulses and high speed for wider) speed signal from Mach3.

The question is whether the board has intelligence to synthesize a variable 0-10V signal proportional to the pulse-width of the PWM and suitable to feed to the Fuling.

If so, and I would not be surprised if it were the case, your task would be to disconnect the three wires currently carrying speed from the 15-pin board and use only one to take a new type of speed signal to the Fuling--and simultaneously edit its expectations (from its own control panel).

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