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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Glueing aluminum to other metals
Hi,
I need to space off a PCB by 0.25" behind a small (4" x 1" x 0.06" thick) anodized aluminum front panel for an electronics project. The PCB contains the push buttons that protrude through holes in the front panel. The PCB has M3 holes drilled for fastening purposes but I can't put holes in the front panel for appearance sake. I need to fasten the PCB strongly enough so there is no danger of it coming loose when the user presses one of the buttons. My idea so far is to glue 4 metal hex spacers to the back of the aluminum panel. I can then bolt the PCB to that. Alternaitevely the same kind of idea but glue the flat heads of 4 countersunk M3 screws to the panel instead (I'm thinking the contact are of a screwhead will be greater than that of a hex spacer with its central thread hole). The hex spacers are made of nickel-plated brass. The screws could be zinc plated or stainless steel. So far I've tried an epoxy ("plastic steel" by Draper) with the hex spacers. Initially it seemed ok, but with a small amount of leverage the spacers came away. Could someone please suggest whether I would get better adhesion on the anodized aluminum with the zinc screws, stainless steel screws or the nickel-plated hex spacers? What epoxies would you recommend? I've also been advised that curing the epoxy will improve the adhesion - does this make a big difference? Many thanks, Dave |
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