I have been building and rebuilding my unit for a while. Been using it for past 2 months, but, not really for precision cuts yet. I have been tweaking it here and there. Finally got it working good, Except One BIG issue. My cutting area is 4ft by 3ft. That is fine, it is stable enough, BUT, the Gantry doesn’t always track in the same straight line. The problem is the X or Y center pipes can get Cocked… With the steppers turned off, you can manually cock the X or Y pipes. By that I mean you can move one side of, say the X axis, and not the other for a slight distance. For example, let say that with the gantry all the way to one side, and just dealing with 1 axis at a time, say that both sides of the X axis are 10 mm from the Corner post. You can manually move just one side, slightly, to where it maybe 15mm from the corner, and the other end of the pipe could still be 10mm from it’s corner. If you start cutting that way, then the cutter will move slightly off angle, because once the motors are energized they will move in sync to each other. What is happening is that I move the gantry around manually to assure that my work is laid down on the table nice and ‘straight’ where i can run the cutter from one end to the other perfectly along the edge. BUT, then I manually move the gantry and again, and the pipes cock slightly differently, and now the cutter goes off by 4 or 5 mm across the 4 foot span. It all depends on how the axis is cocked, but, I don’t know how to make it the SAME each time. I don’t see any way of making sure that the X or Y axis are always ‘square’, as soon as I turn off stepper power and move it manually, it is different each time.
Am I explaining this correctly, or do i have to make a video to show what I am talking about?