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Looks like those are to attach sockets to a chassis back panel, yes?
First, use cyanoacrylate glue (aka Superglue), the thin type not the gel type. Apply sparingly into each crack, and use a C-clamp to hold it together until it dries. This is just to return the piece to the original dimensions without extra play where the screw, screws in.
Next get a round piece of plastic of larger diameter, for example the body of a plastic marker, or a piece of PCV plumbing pipe, etc. with the end of it plugged.
You want to slide that over the cracked piece, as a shell around it with an air-gap in the middle. The end of the shell should be flush with the end of the cracked piece, where it screws to the chassis. You will seal the end with masking tape to form a leak-proof barrier. The other end of the shell should be plugged so it is also a leak-proof barrier. The bottom of the shell should be taped to the cracked piece, also forming a leak-proof barrier.
The top of the shell should have a large hole or a split portion. You are essentially building a tube around the cracked piece with the only way for liquid to get in or out is through the top from gravity.
Into the large hole or split portion, fill it with slow set epoxy.
Another alternative is put in a very thin layer of epoxy then lay fiberglass cloth around the perimeter, coat that with more epoxy, through another layer of fiberglass mating on top, and coat that with epoxy.
Another more permanent (can't be disassembled again later without much frustration) is reassemble the whole thing into the chassis but just before you screw the screw into the cracked portion, fill the whole with epoxy then screw the screw in, then let it set for a day.
Another option, forget about those PCB mounted jacks. Get panel mounted jacks, mount them to the chassis, then connect them to the PCB with wires.
Another option, make a back-plate that sits behind that vertical jack assembly and extends past both sides of it. Put two additional holes in the chassis wall and run long screws through the chassis holes, into the backing plate behind the jacks.
Another option, leave those jacks there but unused. Run jumper wires from their solder points on the PCB to a different location where you mount panel mount jacks in new holes you drilled into the wall of the chassis.
Another option, if the outer barrel of the jacks is at chassis ground potential and the chassis is metal, solder them to the chassis wall, or if there is clearance to still get the jacks inserted, after protruding from the chassis wall, slip thin washers over the sockets and solder those to the socket outer barrel metal.
Another option, use a very long bolt and put the bolt all the way through the cracked piece and secure the bolt behind the cracked sleeve with a nut.
I'm sure there are other methods but surely one of the above will work.
It is difficult because the cracks do not have openings the cracks are joined I need a product that enters the crack and permanently paste the plastic so it never breaks when putting and removing the screw, a friend oriented me silicone liquid, you gave me these options but I'm confused which option to choose to fix permanently, the screws I use are TV originalPenetrating the cracks is not a long term solution, would only serve to hold the material together in the right diameter for the screw while you either fortify the surrounding plastic with an overmolding (filled with epoxy was my suggestion) or to mechanically fix the socket from the front or rear.
There is no way to just mend the crack itself and make it stronger than the original material which obviously was too weak or else it would not have cracked. Granted an error at the assembly factory could have over-torqued the screws or poor packaging material could have caused a bump against the side of the box to stress them, but ultimately you are looking at one of several methods to additionally fortify what is there.
Which way is easiest depends on your experience working with epoxy, having materials to build a shell around it, or having a piece of plate metal to put behind it, having sufficiently sized screws or buying some, or willingness to drill new holes in the chassis and buy panel mount sockets if you don't have any, etc.
Perhaps I listed too many options but there is more than one way to skin a cat.
Since I have some epoxy, I would get the body from a magic marker, make a shell around it, seal off both ends and the bottom where it meets the existing plastic so none leaks out, and fill the top with epoxy after having superglued the part together with clamps first so it was the correct diameter. It may be easier to do it (with experience) than to describe it.
I agree with ALL of the replies.
Except nobody has mentioned whether or not these mounts are 1980s brittle plastic. It just keeps breaking!.
As suggested already, I would sleeve the mount but with thin brass hollow rod epoxied in place. Also epoxy the screw hole and insert the screw. After two or three hours carefully and slowly remove the screw. Leave area to cure over night. It should now be stronger than new.
View attachment 45236
Martin
Socket rca is no longer for sale here do not think it used, I would not like to open more plastic cracksThe only chance you have to permanently fix these is to solvent weld the cracks. That would mean you would need to know what type of plastic it is. Then you would need to slightly expand the cracks so the solvent would flow into the crack, then find some way to clamp the crack back closed.
Alternately, you could replace the RCA socket assembly.
I do not have bronze rod I want to permanently close these cracks