squaring up the x/y axis

I’ve been searching the forum, and I’ve been looking for a “how to” on squaring up the gantry for even squared cuts. Could someone point me in the right direction or to a walk thru and/or explain the process in steps? Is there a G command I need to run after I get it squared? I forget the process involved. Thanks in advance!!!

I really need to make a video of this, only take a minute but hard to explain.

Set the bit where you want to start your cut. Then measure from your x axis rollers to the nearest corner block, both measurements should be as equal as your can possibly get them. Repeat this for the Y axis, double check them all again. Start your cut!

Bam…Make sense?