Sign & Digital Graphics

July '17

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82 • July 2017 • S I G N & D I G I T A L G R A P H I C S ARCHITECTURAL AND ENVIRONMENTAL The post caps would be basically glued in place with a small amount of silicone after the sign was installed. The caps were shop-made from scrap pieces of 3/16" thick aluminum bolted together with small countersunk flathead stainless steel machine screws. A small sheet metal tab was included on the inside surface of each one to provide something to hang them from for powder coating. Before sending the posts and caps to the powder coating shop, the slots in the posts were sanded and filed smooth inside and out so the sign mounting bolts, with their nuts and washers in place, would slide through them easily. The posts were powder coated a Tiger-Drylac "Steel Rack White," which matched the pre- finished sign faces almost perfectly. The assembly in the field literally takes minutes, and no post mounting hardware is visible. Over the protruding studs at each end of the sign, a locknut —with a flat washer—is treaded into place. The top nut can be tightened after the fact, but the bottom nut has to be adjusted fairly snug to begin with since it cannot be reached after the sign slides in place on the posts. Soapy water is used as a lubricant to ease the job of sliding the posts onto the ends of the sign, and once the sign is in place on the posts, both top locknuts are tightened securely to permanently attach the posts. The flush countersunk style rivets are touched up carefully in the field, one small dot at a time. Getting to both sides at the same time was easier after the sign was installed. This type of no-weld sign construc- tion is a quick build project, but it pro- duces a sign that has a clean appearance, is extremely strong and will last for many years. For the client, or the sign maker, what's not to like about that? These 1/8" diameter rivets are made to be countersunk, and are really flat compared to normal pulled rivets. They are ideal for use with aluminum laminate which is perfect for countersinking. Aluminum laminate is very soft, and it takes careful control to countersink each hole exactly right, but it can be done. Unlike regular rivets, a countersunk rivet is truly flat and when painted to match the face they are visually insignificant. The unpainted slotted posts are put in place temporarily and marked to be cut to pre- cisely the right length. The trimmed posts will be filed smooth on the inside so the post caps will fit correctly. The posts caps are shop made from scraps of 3/16" thick aluminum. The small tab provides a way to hang them for powder coating. To prepare the posts for powder coating, all oxidation is removed with a mesh wheel on a small hand grinder. The slots have been sanded and filed smooth as well.

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