Materials and Tools[edit | edit source]
Note[edit | edit source]
- DO NOT REAM the holes in the top of the carriages where the limit switch adjustment screws seat!
- The belt terminators (assembly steps detailed below) have a narrow passage that the belt passes through twice - that passage needs to be cleaned with the precision knife. (During printing of the terminators, small protrusions form, making it very difficult to slide the belt through the passage.) Additional insurance against loss of belt tension is afforded by the small wire ties on the belt tails.
Procedure[edit | edit source]
- Wipe down the guide rods with a clean cloth or paper towel to remove any abrasive dust that may damage bearings.
- Start the 8mm guide rods into the motor end clamps, rotate while pushing into the clamp. The rods should fit tightly in the clamps but not so tightly that beating on them is required to get them to seat; ream the 8mm guide rod holes in each motor end with an 8mm drill bit if necessary. It isn't necessary to push the rods all the way into the clamps yet.
- Slide lubricated LM8UU bearings onto the rods – one per rod.
- Return the printer to the work surface.
- Using diagonal cutters, cut off the tails of belt that extend out of the terminators so that only about 11-2 cm of tail remain.
- Repeat belt installation and tensioning with remaining two apexes.
- Test fit the carriages on their guide rods: Put each of the carriages on the rods but not over the LM8UU bearings. Slide the carriages up and down the rods taking note if there is resistance. If there is, remove a small amount of material from the guide rod pockets in the carriages with a sharp precision knife. Repeat the test and adjust the pockets until each of the carriages slides freely on the guide rods.
- Run the carriages and bearings up and down the guide rods checking that there is not too much friction. If they are difficult to move, check the clearance between the carriage and guide rod. Snap off carriages that are hard to move and enlarge the guide rod opening with the precision knife.