Sign & Digital Graphics

July '17

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80 • July 2017 • S I G N & D I G I T A L G R A P H I C S ARCHITECTURAL AND ENVIRONMENTAL Shop Fabrication Shop-made "no-weld" architectural sign B Y R I C K W I L L I A M S Shop Talk finish in the end. But the actual internal frame parts would go unfinished, as the top of the sign is well above eye level, and the bottom edge below, and the ends will never be seen. The posts were slotted on a wood cutting table saw, equipped with a fine-tooth carbide tipped blade. Studs of 3/8" diameter would secure the sign to the posts, so the groove we cut needed to be a bit more than .375" wide. The slot or groove was cut slightly too long, and the posts would be trimmed to the exact length last. A tape mark on the posts and on the table saw were used to get the slot cut to approximately the right length. To slot the posts, a saw cut was first made in the exact center of each posts, and then the rip fence was moved over approxi- mately 3/32" at a time, on either side of the saw cut. After a few passes, when a 3/8" diameter bolt would slide easily in the grove, that part of the job was finished. The internal framework, not welded at all but held together by the faces themselves, was made from 1.5" x 1.5" aluminum tubing with an .080 wall thickness, which is not expensive but plenty strong and rigid. These were cut on a miter box saw, which most shops would have. Four shop made fittings, two for each end, were made from a small strip of steel flat bar into which a hole was drilled near each corner. A 3/8" bolt, with its head cut off, was welded to each steel strip with the threads protruding about 1". These fittings were screwed to the ends of the two long members, and turned toward the inside of the sign. The vertical members of the frame were cut to loosely fit between the long members and not attached to anything but the faces. Again, no welding would be needed, the critical mea- surement was that the long members were exactly 96" long to fit the faces perfectly. The aluminum laminate faces sandwiched the four frame members together and some special rivets were used to secure everything together. These very low-profile rivets are made to be counter sunk, and lay really flat when installed correctly. After a hole is drilled, it is carefully countersunk, and the installed riv- ets seat down into the surface flush and smooth. When painted to match the face, these countersunk rivets are truly insignifi- cant, and at any distance virtually invisible. Once the sign was assembled, the unpainted posts are put temporarily in place, and the exact top of the posts are marked, just short enough of the top of the sign to allow for a 3/16" thick post cap. After marking the posts, they were neatly trimmed on a metal bandsaw, but can be cut just as well using a miter box saw and a slow hand. A miter box saw with a fine-tooth blade will cut a true 90-degree cut better than any bandsaw. F or this month's Shop Talk, we'll look at a very simple sign project, but one that has significance for every sign shop that has limited means for welding aluminum, yet needs to make signs that are clean and professional looking and also hide or minimize fasteners of any kind. This large 4' x 8' architectural sign, made from aluminum tubing and aluminum laminate sign face material, was fabri- cated using the most basic shop tools, and required no alu- minum welding and almost no welding at all. The posts are secured without visible hardware, and the finishes are profes- sional, or in the case of the faces factory applied. Because aluminum laminate material lays very flat and has a durable factory finish, it is a favorite of sign makers today. But, having some thickness, unlike thinner prefinished aluminum sheet (.040 or .063), it is ideal for small counter-sunk fasteners. On this job the fasteners for the faces are exposed, but are so small and flush as to be almost invisible. Two faces back to back, sandwiching the framework, create a "stressed skin construc- tion" that holds the sign together. The posts are aluminum square tubing, 4" x 4" in size, and the posts and their caps would get a durable powder coated Rick Williams owns Rick's Sign Company, a commercial sign shop in Longview, Texas. He has been in the sign industry since 1973 and documenting the sign business since 1986. Contact him at RickSignCo@aol.com. All the parts to assemble a large shop-made architectural sign, with its posts, make for a short list, and will be assembled without any aluminum welding.

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