You can choose to use M5x65mm hardware for this. We are using longer hardware cut down (M5x80mm) to ensure the bearing runs upon a smooth shaft. To note, the M5x65mm hardware has issues with the clearance of the front gantry plate as it’s a very close fit! We supply four M5x80mm hardware already cut down ready for use.
One option is to dry fit it to get a required length of bolts, which you can cut down manually.
Place a standard washer on each of the M5x65mm bolts.
Insert one bolt each into the four corners of the front carriage plate.
Tip: We like to use four small cups to allow easy assembly!
Apply two 6mm eccentrics to the lower two bolts and on top of that, one 3mm aluminium spacer. On the top bolts, apply one 9mm aluminium spacer. We used the large spacer size (9mm) to give more clearance, due to the use of washers on the front carriage plate.
and lastly, one precision shim (5mm x 10mm x 1mm) on each.
On the bottom two bolts, add another 6mm eccentric spacer, and on the top two bolts add a 6mm aluminium spacer.
Apply the rear carriage plate.
and a M5 hex nut.
Tighten all nuts to half the travel of the spring washer. This is part of the reason why we used spring washers as it allows us to achieve even tension while adjusting parts of the machine.
Align all eccentrics to their largest clearance, notch facing downward. Using a square, snug up all four bolts, doing opposite diagonals. By snugging up diagonals rather than around in sequence, it helps maintain even tension and alignment.
This is a good opportunity to do a rough fitting of your eccentrics.
Use a spare gantry beam to get even tension against all wheels. We recommend doing the final tuning and tightening once the machine is fully assembled and in place.