Stock Side Frames
New Side Frames
But the mounting error did not make up the for the full amount of error which measured approx. 3.97mm (.156)? This means that the laser is 4mm closer to the surface at its -Y extreme.
You can see from the above video the Vslot wheels are not tightly cam'ed to the Vslot extrusion. There is NO adjustment to tighten the wheels up.
I think it is traditional to have eccentric columns on opposing wheels to make fine adjustments in these kinds of designs.
I do not know for sure if the cams above will fit but I will try them.
Improvement in Carriage Stability
- The downward error could be eliminated by adjusting the angle that the side frames mount to the X extrusion. Effectively lifting the Y-axis upward. The weight of the head would bias the wheels downward. This would not stop the carriage from bouncing upward under acceleration.
- The downward error could be eliminated by putting a rolling foot on the end of the Y extrusion. This foot would ride against an X cross member that would provide a fixed vertical reference. If the foot was adjusted such that the wheels were biased upward it may prevent any up-down movement.
Long Term Design Changes
- Eccentric adjustments of the X carriage wheels.
- A cross brace at the bottom of the travel allows the end of the Y-axis to ride on a fixed vertical plane. Not sure what is the best way to implement this.