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By the end of this stage, your machine will look like this
id=”" align=”aligncenter” width=”300″ caption=”x and z axes assembled” 
You will need the following tools
Now is a good time to ensure the Z smooth rods are square to the Y axis smooth rods. place a set square on the Y axis smooth rods and adjust the bar clamps at the bottom of each Z smooth bar in turn to get it square. On machine #248, the distance from the Z-axis bottom threaded rod clamp surface to the Y-axis motor mount corner block was 91.6 mm; this will get you close to square if you machine has the specified corner block to corner block dimensions. Side to side the gap between the Z-axis rod clamp surface and the Z-axis bottom threaded rod clamp was 38.9 mm.
id=”" align=”aligncenter” width=”300″ caption=”Squaring the Z smooth rods” 
id=”" align=”aligncenter” width=”300″ caption=”Z axis motor and couplings” 
|NEMA 14 stepper motor||2|
|Poly tubing 15mm||2|
|M5 full nut||2|
|M5x165mm Threaded rod||2|
Begin by cutting the Poly tubing into 2 equal lengths, each of which should measure approximately 15mm, and slide each onto a stepper motor shaft with a flat on it.
Insert an M5 full nut into each of the X ends and screw the M5x165mm threaded rods into these.
NOTE: Ensure the threads of the M5 threaded rods are free from dirt/grit. It is also a good idea to lubricate these rods.
id=”" align=”aligncenter” width=”300″ caption=”Z threaded rods screwed in” 
Loosely assemble the couplings.
id=”" align=”aligncenter” width=”300″ caption=”Assembled couplings” 
Loosen the clamps holding the Z smooth rods, and lift these up out of the way. Place the Z motors onto the Z motor mounts, and fit a coupling to each poly tube covered motor shaft.
id=”" align=”aligncenter” width=”300″ caption=”Coupling fitted to Z axis motor” 
Tighten the top 2 coupling screws enough to hold the couplings in place, then screw the M5 threaded rods into the bottom of the couplings.
id=”" align=”aligncenter” width=”300″ caption=”X/Z axes loosely fitted” 
Rotate the Z motors such that the wires face inwards to the machine, and screw the motors to the Z motor mounts using 2 M3x16mm screws (each with a couple of M3 washers) for each motor.
Tighten the coupling screws and slide the Z smooth rods down through the Igus bushings and into the bar clamps at the bottom of the frame.
Using pliers, twist the X tensioning wire to pull the X axis toothed belt tight. Also tighten the M3x16mm screws which push the X axis smooth rods from the X idler end. When you have this correct, the X smooth rods will run centrally through the Igus bushings, with the X axis assembly at both the top and bottom of the Z smooth rods.
Rotating the Z axis motors by holding onto the couplings should move the Z axis freely from top to bottom.
|#4×1/2″ Self tapping screws||4|
Screw the nozzle mount to the X carriage using the 4 self tapping screws.
id=”" align=”aligncenter” width=”300″ caption=”Assembled X and Z axes” 
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