Each gantry wheel plate will have nine wheel assemblies attached to allow sliding along the tracks. The five wheels that ride on the top of the tracks will be attached to the plates with standard spacers. The four wheels that ride underneath the tracks will be attached to the plates with eccentric spacers. The eccentric spacers will be used to finely adjust the spacing between the top and the bottom wheels such that the gantry will roll smoothly and snuggly along the tracks.
You need to assemble a left-hand and right-hand version of the gantry wheel plate assemblies. To reduce the likelihood of an assembly mistake, we recommend laying out the gantry wheel plates as a mirror image of each other and attaching all of the wheels facing towards you.
Insert an M5 x 30mm screw through a V-wheel and a standard spacer. Then insert this into the gantry wheel plate as shown and add an M5 flange locknut on the other side of the plate. Tighten the wheel assembly using the 3mm hex driver and the 8mm wrench, then repeat for the remaining four V-wheels with standard spacers. All five of these wheels should be positioned on the plate in a straight line.
Insert an eccentric spacer into the gantry wheel plate. Then insert an M5 x 30mm screw with a V-wheel through the spacer and secure the assembly with an M5 flange locknut on the other side of the plate. Repeat for the remaining V-wheels attached with the eccentric spacers.
Repeat the above steps for the second gantry wheel plate assembly. You should end up with two gantry wheel plate assemblies that are mirror images of each other.
The eccentric spacers on the lower wheels of each gantry wheel plate assembly are used for making fine adjustments to the spacing between the lower wheels and the upper wheels. Adjusting this spacing is the key to having your gantry move smoothly and wobble-free across the tracks.
If the spacing is too little, then the gantry will not fit onto the tracks at all or be tough to move. If the spacing is too great, then the gantry will be wobbly and loose. Adjust the eccentric spacers using the eccentric spacer adjustment reference guide.