These cubes are stacked as pairs, with the upper pair mounted on hidden castors so they're free to swivel. Two are left open, and the other two are double-sided with doors and an aluminum rod behind.
Step 1: Paint the Panels
Step 2: Cut the Miters
Step 3: Drill the Caster Holes
Step 4: Assemble the Cubes
Step 5: Attach the Doors
Step 6: Secure the Hidden Casters
Step 7: Make the Door Handles
Step 8: Add the Casters
Step 9: Secure the Pivot Bolt
Once assembled, apply three-in-one primer, sealer and undercoat; then, two coats of glossy enamel. Let dry.
Mark the diagonals on one panel with masking tape, marking 4 3/4-in. from the center for the caster holes. Drill the holes using a drill press and a 1 3/4-in. holesaw or Forstner bit. Drill 3/8-in. holes, 1/4-in. deep in four panels for the aluminum rod (see diagram below).
Position the panels inside down, connecting them with packaging tape. Turn the panels over to apply adhesive on the mitered edges, taping securely.
Using tin snips, cut the piano hinge the length of the door and use an offcut to align and drill 1.5mm pilot holes, securing with #6 x 1/2-in. screws. Position the hinge on the edge of the 13-in.-wide cubes, securing top and bottom screws first.
Position the casters in the holes and tap with a rubber mallet so the base flange of the casters sit flush against the base. Drill 1/16-in. pilot holes and secure the caster flanges to the base using #6 x 1/2-in. wood screws.
Use a miter saw or miter box and tenon saw to cut 45° ends of a 1 1/4-in. x 1 1/4-in. pine offcut, cutting one side then rotating and cutting three more times. Cut the front of the handle square, 3/16-in. from the mitres, securing with #8 x 1 1/4-in. wood screws.
On the base of the bottom cube, use a square made from 1 1/4-in. pine offcuts to mark the casters in from the edge. Drill 5/64-in. pilot holes to secure the casters using #8 x 5/8-in. screws.
Secure the cubes in pairs using #8 x 1 1/4-in. screws, drilling an 5/16-in. hole for the pivot bolt at the center of opposite panels. Drill a 1/2-in. hole 3/16-in. deep to countersink the bolt head then use a washer and locknut to secure from below.
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