Step 4 Rail System

Install Left Y Rail

Carefully insert the V-shaped edge of the Left Extrusion Rail through the Y-Axis Left Carriage V-groove bearings as shown in the image below.

Install Right Y Rail

Carefully insert the V-shaped edge of the Right Extrusion Rail through the Y-Axis Right Carriage V-groove bearings as shown in the image below.

Position Assembly

Move the assembly so the left Y Rail is sitting between the front and rear plates as shown in the image below.

The front and back of the extrusions have screw holes tapped for four (4x) M6x12mm screws. These will match up to the holes in the End Plates as shown in the image below.

Securing the Left Y Rail

You will initially use only two (2x) M6x12mm screws to attach the Left Extrusion Rail.

Lifting the rail to align at least one hole from the extrusion to the front plate, insert 1 screw into the front plate, and one screw into the back plate. Only finger thread the M6x12mm screws and do not tighten down completely.

These two screws will support the rail and give us a pivot point to help rotate the right rail into place.

Securing the Right Y Rail

Move to the right side of the assembly. Using the foam blocks from the Y-Left and Y-Right carriages, support the Y-Right rail as shown in the image below.

You will initially use only two (2x) M6x12mm screws to attach the Right Extrusion Rail. Insert 1 screw into the front plate, and one screw into the back plate. Only finger thread the M6x12mm screws and do not tighten down completely; leave a small gap between screw and plate around 1/16” or 2mm.

Completing Rail Assembly

Once the Y-Left and Y-Right rails are loosely secured in place, use the remaining twelve (12x) M6x12mm BHCS to completley secure the rails to the baseframe. Do this by installing 3 additional screws into each end of the end plates. Each extrusion should be secured with 4 screws at each end.

Do not completley tighten these screws, we’ll need some adjustment later when we begin to square the machine.


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