Need some help getting setup… the upper v wheels on the right Y axis carriage plate do not align with the y axis extrusion. They extend about 1mm too far. The lower v wheels are aligned with the extrusion. The right Y axis carriage plate is not square with the x axis rail. The left side is better but still not square. To me it looks like the end of the x axis extrusion is not cut square and/or is not the right length. I measured the top length of the extrusion at 0.010” longer than the bottom length of the extrusion.
The machine is on a torsion box, and I followed the machine squaring instructions by loosening the bolts and moving the gantry front to back etc. I leveled the rails following mikep’s write up. I put a mag base on the z axis and the indicator against the side of the y axis extrusion. I moved the z axis up and down and the travel is parallel with the side of the y axis extrusion within .002”. So the x axis extrusion is square with the y axis extrusion (in the x-z plane) but the y axis carriage plate is angled 1/16” across the height of the y axis extrusion. This shows up when putting a square between the y axis carriage plate and the x axis extrusion.
Some people have reported the cuts at the ends of the extrusions not being completely square. That may be the case here. A shim of aluminum can at the “short” end of the extrusion usually gets that sorted out.
@mikep if I shim the short end to square it, it looks like it will take LOT of shim… not just a couple pieces of foil. And then I’m still over 1mm too long for the v-wheels to line up with the y axis extrusion?
I had a similar experience. In my case, I very carefully spent hours systematically filing the X-axis extrusion ends until they were square.
Since this process can shorten the extrusion to some degree, I removed the powder coating from the 16 Y-Axis end-plate holes to help allow for the “shorter” X-Axis.
Seems good so far.
I take it you have the eccentric nuts fitted to the bottom of the carriage?
Can you measure the distance between the top and bottom holes? There might be a slim chance that they are not drilled correctly but I’ve never seen anything like this.
Yes, the lower v wheels, connnected to the eccentric nuts, are centered on the v in the extrusion, but this causes the carriage plate to bend inwards 1/16” inch at the bottom. My current thought is that the x extrusion is ~1/16” too long.
Ok with the right side eccentrics tightened so the v wheels are centered on the rail, but the carriage plate is bent inwards at the bottom, I loosened the left side eccentrics. This pushed all of the left side v wheels out of position to the left rail. See picture. I think that proves the x extrusion is too long…?
