Please do not attach anything to this assembly above the tool mount. You will see lots of images of people attaching cable chains, wires, and vacuum hoses to the motor mount. This is the absolute worst place on the entire machine to attach anything!
It will act as a torque multiplier and completely ruin your accuracy/precision.
Anything necessary should be attached to the main gantry assembly lots of room on the XYZ piece.
Insert the 4 nuts into the nut traps, if they aren’t a tight fit a drop of glue here will help in assembly in the next step.
Insert the NutTrap into the Z Rail 1 at a time and use the .75″ screw to attach the ToolMount. I tighten these screws to set the nuts into the NutTraps then back them out to leave this extremely loose for now. If your nut traps don’t fit your rails thickness well Geodave made a nice parametric part here, http://www.thingiverse.com/thing:907882
Press the bearing into the Z-Lower bracket. Make sure it is seated all the way and not crooked.
Slide the Z-lower bracket onto the z rails as shown. Slide it a few inches past where you think it will end up. Use no screws yet.
Use 3 M3x10mm screws to attach the stepper to the Z-Motor bracket.
Slide the Pineapple Coupler onto the Stepper shaft. If the stepper half is long enough make sure not to go past the half way point (inner ridge). If you have a “D” cut stepper shaft I orient the flat at the coupler seam. Use no screws at this point.
Slide the Z-Motor bracket on to the z rails approximately (if you cut your rails carefully) flush with the rail tops. No screws at this point.
- At this point I hang the assembly off the edge of a table (A glass or metal table makes this easy). Make sure the rails are sitting flat on the table, and tighten the ToolMount screws.
- Check again, are the rails still flat? Sometimes they will slightly twist and you can easily fix it here, Much easier than on the machine.
- If the rails are good, add the .75″ screws and nuts to the Z-Motor bracket only, snug slightly.
- Check again, are the rails still sitting flat?
- Pull the Z-Lower bracket up tight against the Coupler this should take care of most of the stepper slop. Make sure the brackets are parallel with each other (you can measure each side near the screw holes).
- Once again are the rails still sitting flat?
- Add the screws and nuts and snug slightly.
- Final check are the rails still flat?
- Thread the leadscrew/all thread into the coupler. Make sure it is all the way and should hit the inner ridge/stepper shaft.
- Snug this up with the .75″ screws and lock nuts carefully. Snug to tight is good, cracks are bad! The leadscrew should be nice and parallel to the z rails and not bent.
EVERYTHING BELOW THIS IS FOR THE PREVIOUS PARTS
3/4″ screws and lock nuts.
Leave the screws loose until final assembly.
The rigid coupler gets the two 1/2″ screws and lock nuts. Leave these very loose.
1 bearing , rigid coupler, stepper, M3 screws
Press the bearing into the bottom of the z bracket.
Press the rigid coupler onto the stepper shaft, pointed side towards the bearing. Use the M3 screws to set the final height of the coupler. It should be pressing on the bearing.
Snug up the coupler screw on the shaft side. During Final assembly you will thread the threaded rod into the other side.
Bear Tech & Tools did it again! Just remember to try and get the coupler touching the bearing.