Attaching the x-carriage to the x-rails.
Lay the upper x-carriage assembly on top of the x-rails, and drop the four (4) M4x40 nuts and washers through the holes in the four corners. Important Note: There are 2 nuts that go under the recess of the upper x-carriage half that are used to mount an extruder. It it easier to place them now and use a short M4x16 to keep them in place.
Figure 1 - Upper x-carriage on rails with 4 mounting bolts dropping in.
Figure 2 - Mounting bolts in place
Slide the lower x-carriage assembly up from the bottom of the x-rails and onto the four (4) mounting bolts.
Figure 3 - Lower x-carriage moving into position.
If using end-stops, you can place an x-flag end-stop onto one of the 4 mounting slots as shown.
Figure 4 - Optional end-stop x-flag in position.
Next add four (4) washers and nuts to the bottom to secure both x-carriage halves together. These 4 bolts serve as tensioners for the bearing-guides to press against the x-rails. The tighter they are the more drag; too much drag will cause over heating of the motor. To little will cause too much play in the bearings.
Figure 5 - Adding the retaining washers and nuts
Figure 6 - Completed x-carraige assembly
On to Phase 9