Gerrry, it looks like a CNCdrive UC400ETH board will control 6 axes. Can I make that work with my Gecko G540, and then another single drive so I don't have to do the unplug/replug thing??
Yes, just plug the G540 into one port, and use a breakout board to connect your additional drive to the second port.
I recently learned of S-Curve acceleration Vs linear. Does UCCNC support S-Curve or something like that?
As soon as they release the next full versionof UCCNC, CNC drive is planning on writing a new S Curve trajectory planner. It'll probably be 6-12 months, maybe a little longer, if I had to guess.
The only low cost control I'm aware of that currently has S-Curve accel is the TinyG.
I definitely have more wires plugged into my Warp 9 smoothstepper board than the UC400ETH has places to plug in to... Would a UC400ETH replace my Warp 9 smoothstepper stuff, or would I need something else?
The Smoothstepper has 3 ports of I/O, while the UC400ETH has 2 ports. If you need more I/O, get a UC300ETH, which is only about $20 more, and has 5 ports, plus analog inputs and outputs.