Ready Steady Eddy

[JAZZCNC]

Sorry my friend, but that is not correct. I didn't think so when I read it, so I just went out to the garage to check. My machine has a lot of flex, so I can easily rack the gantry one way or the other. I have dampers on my steppers, so with the power off, I can move one side by turning the dampers.

First I moved the master side about 3mm away from home, then powered up the machine, and homed the X axis. The slave axis hits the switch, and backs off, while the master keeps moving to it's switch, then it backs off.

Next, I moved the slave side 3mm farther from home. This time, the master hits the switch, and backs off, while the slave keeps moving.

Each side of the gantry (master and slave) move independently to their own switches. For all practical purposes, they are not slaved during homing.

To be honest Gerry I wasn't 100% sure my self it worked like I said and couldn't can't check as I don't have slaved motors on my machine. Last machine I setup that used slaved motors was several weeks ago and was using the ESS but I'm sure that stopped both motors and backed off then moved slave.? Thou I'd have to check again to be 100%. I don't ever use PP so can't check if it works differant to Motion control cards but I will on next slaved machine I'm building just out of curiosity. Previous machine also used Motion control card but that was Russian PLCM and thought that did the same but again can't be 100%.? Esp as it happens so fast and with gantry being square so hard to see.!

But more the point was they work together to square the gantry and like as been said if the gantry's setup square to start with and switches located at same point it's a seamless operation and very little twisting forces applied if correctly setup.

Edit: One other thing for clarity for others (Gerry knows this ).? The speed at which you home makes a big difference to accuracy and how far it over shoots then as to backoff. Thick of it as driving wheels upto a line in your car.! At fast speed chances are you'll over shoot further then have to back up more to put wheels on line. Same principle go slower and chances are you'll hit the line ever time with little to no over shoot.