I have a Woodworker X50, and recently added the 3rd rail.
In anticipation of the switch, and to see the difference if any, I measured deflection at 3 locations on my machine, applying push/pull force (max 50N) in both X and Y direction. I did the same after the installation of the 3rd rail. Deflections were measured using a 0.002mm increment dial test indicator, and video recorded for more accurate reading.
Using software I created scatter plot graphs for deflection (microns) and applied force (N in 5 N increments).
Results showed the 3rd rail reduced machine deflection in all locations and directions by about 25 - 45%.
The graph below shows the deflection at the bottom of the Z20 assembly when force is applied in the Y- direction, with and without the 3rd rail. NOTE: all axes were positioned in the middle of their max travel, with motors on.
