config two motor on gantry axis (Y) to square the machine

I guess they need to be different, pair one of them up with Z,X .

How should the system know which one triggered first? when both are moving towards the home switches?

andypugh wrote:

You could (with the correct HAL and INI config) use only two input pins for X, Y1, Y2 and Z. But Y1 and Y2 need to be different pins.

does this look right for the HAL pin assignment, for a XYYZZ machine?

net both-home-x joint.0.home-sw-in <= parport.1.pin-11-in-not
net both-home-y1 joint.1.home-sw-in <= parport.1.pin-11-in-not
net both-home-y2 joint.2.home-sw-in <= parport.1.pin-12-in-not
net both-home-z1 joint.3.home-sw-in <= parport.1.pin-12-in-not
net both-home-z2 joint.4.home-sw-in <= parport.1.pin-11-in-not

I am in the process of a cnc build, how is the gantry checked for square with a dual motored axis, Is there a routine in linuxcnc to use a probe to self check its alignment and restore the offsets or is it a manual process by checking with dti. Also I plan to put dual linear scale on the dual axis so can these be used to verify the gantry's squareness.

Hello ianlowe

Have you made any progress with the picture for aligning a whole or have you even finished it?

I also have a ganty with dimensions x 2500mm and y 1200 mm
How do you align yours ?

Hi MGM
I haven't got a satisfactory solution to a duel motor gantry yet, and I'm not quite at the point with my build when I will definitely need it, still a bit of hardware to build yet. I just tried to get information up front but some things are hard to find. Once I have a solution I will put comments on here if it will help others.

Thanks for the reply tommylight. As I said to MGM I'm not quite there too actually set my duel gantry up just yet. If you can answer any of Mum's concerns I'm sure he will be greatful and I will revisit this topic when I'm actually setting up my machine. Thanks Ian.