[Brian@Premier]

Hello all, my CNC table has two ballscrews on the Y axis. I just finished building the machine and noticed when jogging the Y axis and changing directions there was a slight "racking" between the two sides- like one side was slightly ahead of the other.... I will post a pic tomorrow. The gantry slides on linears on each side with two bearings attached to each side of the gantry- there are adjustment screws on each bearing but I believe it is just to tighten or loosen the "grip" on the linear.
My question is does anyone know a trick to adjusting the gantry/ballscrews/bearings to achieve perfect balance between the two sides?

-Brian


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[ger21]

Most of us using Mach3 have separate home switches for each side, so that when you home the machine, it automatically squares itself using the switches.

Are saying it's out of square all the time, or it's only going out of square (racking) occasionally?

[Brian@Premier]

Hey Gerry, long time no talk to :-)
What do you mean by "switches"? An actual relay or circuit switch to send a signal to Mach3 based on position of gantry/ballscrew? Sorry if this sounds stupid... I too use Mach3 but just a newbie so I am trying to learn as I go.
-Brian


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[ger21]

Google "Limit Switch" to see examples. People use many types. Some use mechanical switches, some use proximity sensors. I use magnetic Hall Effect switches. When you run the homing routine in Mach3, the gantry activates the switch, setting the home position. When you have a switch on each side of the gantry, the two sides will move towards their switches simultaneously, with each side stopping at it's own switch. If the switches are located properly, the gantry will square itself.