Twibright Atlas, an open source CRT wall holder

Provides

Fixed-shape wall mounted CRT holder
Extremely stiff construction
Can hold even the biggest CRTs
Weight 3kg for a 30kg CRT monitor
Only 3 holes in the wall required instead of the usual 4
Large footprint on the wall compared to commercial holders spreads weight over greater area and reduces strain on the wall
Storage for computer cables

Requires

30x30x3 steel L section, 16cm (3 pieces 50mm)
Electric drill and some oil for lubrication
Drill bit 10.5mm and some 3 to 5mm for predrill
Masonry drill 12mm for wall mount
3 wall plugs 12mm and 3 8mm bolts with length prescribed for the plugs
Wrench for the plug bolts
3 washers 8.4mm
A hexagonal piece of 0.5mm steel tin bigger than the monitor foot
15x2 or 15x3 flat steel about 4.5x longer than the diameter of the foot
Steel tubing 10mm, 5m for a 21'' CRT
Band saw or hacksaw
Welding machine
Primer and white top coat for steel, water soluble preferred
Thinner or dish soap and dry rag for removing fat
An angle grinder

Building instructions

Measuring

Measure your CRT to figure out the foot size and position and how far from the wall the foot has to be even when the CRT is turned etc.

Postscript / PDF / EPS / BIG png / DXF (qcad)

Making the feet

Make 3 L-shaped feet according to the bottom half of the drawing. Don't make all of them the same, one has to be mirrored!

Hexagon

Make a regular hexagon 1cm bigger than the foot on each side. Cut the flat steel along the hexagon and weld together to form the tray according to the picture. First tack the sides with 2 spots, then weld the rim completely together, and then complete welding the tin.

Hexagon triangle

Connect 3 points of the hexagon into a triangle as seen in the picture.

Tubing

Weld the remaining tubing. Make sure you don't close the tubes from both sides. Make sure the weld is not porous. If it becomes porous, use high current low metal feed to re-melt it. Make sure the cross-section area that has to crack for the holder to fail is large enough for the weight of your CRT. Derive the dimension of the 3 horizontal pieces from the measured distance of the CRT foot to the wall. Precision is not important except that the tray must be horizontal. Check with a spirit level. Make the welds strong enough to bear the weight of the CRT. After welding grind the welds nice for esthetical reason.

Feet

Weld on the feet oriented according to the picture.

Painting

Remove fat first with thinner or wash the whole thing with dish soap and warm water and wipe dry with a rag. Paint with primer and top coat according to the paint manufacturer instructions.

Mounting

Measure where you want to put the CRT on the wall. First drill one upper hole and mount it, but not tighten completely. Using a spirit level mark exact position of the second upper hole to keep the tray horizontal. Drill the second hole, mount it, mark the 3rd hole and unmount the 3nd one and drill the 3rd one and then mount all holes and tighten firmly.

Storing cables

Computer cables, coathangers, jumping ropes, belts or towels can be stored in several compartments by hanging over the rungs. Do not hang heavy objects. If a rung is bent, the CRT may collapse.