Setup for squaring twin X-axis gantry

[JAZZCNC]

I wouldn't be surprised if it moves at least 1 mm.

Wow Gerry your getting all Metricated now, Watch it you'll be speaking with Yorkshire Mans accent before you know it. . Lol

Eddy every thing Gerry says but I'll also point out the affect of inertia pushing the gantry can lead to error that without home switches on each axis you'll never know about untill the error as accumulated enough to rack the gantry and stall ONE motor. The Mess that can come from this is sickening if it happens at high speed which it often does because that's when torque is lowest.!!

Another way and one I know Gerry used or maybe still does is to bump upto a hard stop on each axis which squares gantry and use this as machine Home position. Then just occesionally bump upto stops to realign.!!

Another way is to permantently fit cheap dial indicator at each side and use these to check if it's losing position.