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DIY: Garden obelisk trellis




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GARDEN TRELLIS OBELISK


1. Cut timber to length
From 90 x 45mm timber, rip four 2130mm-long 45 x 45mm legs at 90º with a tablesaw. Cut 45 x 45mm horizontal spacers from remaining timber at 6º, with opposing angles. Cut four pieces each to 470mm, 333mm, 213mm, 105mm. (Length is for the widest side of the piece.) Rip just enough timber from the two 3900 x 76 x 19mm deck boards to eliminate both rounded edges. Cut the boards 30mm wide. From these, cut four pieces 1525mm long and eight pieces 915mm long. Cut two 45º on one end of each for a decorative peak (see Diagram 1).

2. Assemble the legs
Lay the legs together, with sides touching, tops and bases aligned (see Diagram 2), working from the base up. Set aside two legs. Lay the other two legs on the workbench, sides touching. Secure at top with a heavy-duty rubber band while spreading at the base. Centre the longest spacer at the lowest mark, the second-longest spacer at the second mark, and so on. Fasten spacers using 65mm x 8g stainless-steel screws, starting at the base. As a spacer is fixed, clamp the other or nail a board behind it on the bench. When positioning, leave room for screws to attach adjacent spacers. Assemble the other set of legs.

3. Attach the spacers
Stand the legs upright, tops touching. Spread bases to allow for spacers. Secure tops temporarily with duct tape. Drill a pilot hole and fasten the longest spacer between the legs with a 65mm x 8g stainless-steel screw to one side. Attach the shortest spacer on the same side. Fasten the second and third spacers last. Attach spacers on the opposite side.

4. The finial platform
Make a 115mm-square finial platform from a 140 x 40mm scrap of pressure-treated timber. Cut the piece to 115mm, then cut a piece 115mm long from the board. Draw lines to connect to opposite corners to find the centre and mark with an awl. At the mark, pre-drill a hole for the 5mm dowel screw (double-ended wood screw). Sand the platform for a rounded appearance.

5. Attach the platform
Pre-drill holes on the platform for 65mm x 8g stainless-steel screws. Angle the holes to run parallel to the legs. Screw the platform into the top of the legs. Attach a dowel screw and thread on the finial.

6. Fix the spears
Centre a long spear on each side, pre-drill and attach to spacers with 40mm x 8g stainless-steel screws. Position and attach the short spears between the legs and long spears.

Page 1 | Page 2 | Materials and costs | DOWNLOAD this project (PDF)




Last Updated: 2008-02-21 00:00:00.0