Idea: Module for gantry squaring of slave axis with standalone controller

[Neale]

I thought about doing pretty much the same thing, although I use a CSMIO-IP/M motion controller with Mach3. I had been squaring the thing manually, which worked OK, but someone usefully pointed out that the CSMIO is a four-axis controller, and it's pretty simple to switch between 4-axis and 3+slave axis configurations. Combinied with a homing macro that homes both X and slave axes simultaneously to stop the thing going out of square, it all works fine. Not sure if there is a workaround like that that you could do with the DDCSV?

[devmonkey]

I don't think you can slave the axis at all with DDCSV so this wouldn't work unfortunately. Thinking about it a bit more, it is possible to prototype this without the multiplexers, just have the arduino mirror the controller outputs on its other port, not quite as nice as the arduino is in-line during normal operation but probably not an issue, will have to measure the propagation lag.