Electronics > Beginners
Reinforce Cheap Components?
Ziya:
I'm putting together a battery charger to go with some 18650 cells that I have. My project was coming together nicely until I broke the USB connector off of the TP4056 Lithium Battery Charging Board. Everything is working fine on the work bench but pulling the usb cable in and out a half dozen times tends to kill those tiny boards. In the past I've used electrical tape to wrap up tabs but that doesn't really help. I have a few other parts that I'd like to reinforce as well. Superglue was a no go because it seeps through the holes in the connector and is far to brittle.
So my question is what Hot Glue, Epoxy or other solution do you recommend to reinforce bits that will have a fair bit of push and pull on them? Product links would be helpful, I usually worry if I got the wrong thing.
Then my follow up question is can I use that solution to reinforce and insulate any solder joints that I've made?
Terry01:
I use the stuff from Ebay and it's fine. It sticks good enough, is fine to go over joints and stuff and is very easy to use. I don't know if there is "better" or "worse" stuff.
I will also be interested to see if the more experienced guys have a source for "better" hot glue :)
Ziya:
I've never used hot glue on electronics before. I've seen it all the time when stuff gets taken apart. I was just wondering if it was a different plastic stick I should look for. I got a few glue guns in the tool box. They have what ever cheap stuff Lowes had. I was just looking for somebody to say don't use this, you'll catch things on fire.
Also like you, hey newbie, there's a better way is always a possible response in a forum.
KL27x:
Hot glue is great stuff. Find a brand that sticks well. Use alcohol to remove it. It's very easy to work with, and very easy to remove in most cases.
Sticky side of packing tape can be used to shape it while hot and will easily peel off when cool. You can also trim it, after the fact, with a sharp knife.
Sculpting epoxy is sometimes worth the bother for high temp stuff. Kneadatite is my favorite stuff for this kind of thing. It is used by artists and modelers. I have used much cheaper sculpting epoxies in the past, but for this kind of thing, you rarely need buckets. A stick of blue and yellow kneadatite can last decades, and it doesn't leave residue on your hands. Heat it with hot air to make it less viscous and more sticky and to set faster. It is very flexible after it sets, as far as epoxy goes, making it a good match for working with FR4 and plastic housings, and it's very easy to mix up and use in very small quantities.
Hot glue and most epoxies are fine as a dielectric. Sometimes I use a squirt of hot glue to fill gaps in splices of wire with thick insulation before putting on the heat shrink or tape.
anvoice:
If removal is not an issue, you could try a two-part epoxy. These are quite strong and will stick well to most clean surfaces. You can find one with a high enough viscosity and working time of 5 minutes pretty easily, so you can mix, apply, and clean off any extra if needed before it starts to set.
The issue I had with hot glue is that it likes some surfaces and dislikes others. Vinyl in particular doesn't seem to be one of those it likes too much. Also not as strong as epoxy.
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