I have been running the hicon integra with the mach3 for about 6 months. After the initial setup everything worked great, however I am having the issue now of the X axis getting off. at home the gantry is 1/16 off on the home side and when it travels about 4 feet it gets upto 1/4 inch out. I was thinking a stepper motor going out but when I tested them they are fine, I also checked the transmissions and belts for play and wear they are also fine. i then checked the drive output and the settings have not changed. does anyone have an idea of what this might be?

Before getting in too deep perhaps thoroughly check the mechanicals. Tightness or binding of the axis travel, looseness of a set / grub screw or motor / shaft / pulley coupling etc.

(It has probably happened to all of us at one time or another - what we thought was a tight coupling or grub screw was not quite tight enough).

Tweakie.