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Topic: How to mount circuit boards? (Read 5 times) previous topic - next topic

Oracle

I designed a 2x2" PCB that will have a 2.5" square component soldered to it, and I plan to have a row of these assemblies mounted to a plexiglass backing.  What's the best way to mount them?   I put some mounting holes in the PCBs, but once assembled, the larger component will cover them.  If I socket the larger component, the whole assembly will be too thick.

I'd like to just put the screws through the mounting holes before soldering the component on, but once I have a spacer around the screw, I won't be able to stop it from turning while I try to tighten the nut.

I even thought about gluing nuts to the component side of the PCB, but if the glue breaks, I have a metal nut bouncing around my delicate electronics and no way to reattach it.

Thanks for any suggestions.

johnwasser

There are things called press-fit studs. They have a plain head.  The shaft is splined near the head and the rest is threaded.  You press them into holes (in your case in the PCB) and they work as captive bolts.  You would put spacers on them, stick them through the mounting panel, and put nuts on the other side of the panel.

I did a cursory search and all the ones I found for for mounting wheels so the smallest was 1/4-20 thread.  I'm sure someone makes them in smaller sizes.
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Oracle

Thanks for the reply.  Searching for press-fit studs, I just found the wheel ones you mentioned and a whole bunch of body piercings.  Expanding on your idea though, I did find "self-clinching nuts", which sound good except that my holes are 3.2mm and the smallest self-clinching nuts I could find require a 4.2mm hole.

That also gives me the idea of gluing a bolt into the holes, if that glue breaks, the bolt will have nowhere to go.  Maybe a nut directly on the other side of the pcb from the bolt head?

CrossRoads

Are these too big for in-board sockets for your component so it can sit on the board as if soldered in?
http://www.dipmicro.com/store/index.php?searchStr=pin&act=viewCat
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Oracle


Are these too big for in-board sockets for your component so it can sit on the board as if soldered in?
http://www.dipmicro.com/store/index.php?searchStr=pin&act=viewCat


It matches 68 pages of items, I think you mean the pin receptacles that are the first match.  The smaller size is still bigger than my drill hole and probably too big to get a friction hold on my component, and at 25 cents each in quantity, for the number of holes involved, it will double the price of my project.

I'm thinking of using standoffs like http://www.dipmicro.com/store/SPC-M307B which I screw to the board before I solder the module, but if it loosened, I couldn't retighten it so maybe some threadlocker is a good idea (and I've always hated threadlocker).  Also he only has 13 in stock.  I already emailed him since it says restockable.

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