General > General Technical Chat
Anyone familiar with plastic welding/soldering?
LaserSteve:
Mcmaster.com Everything you want. Has a great search engine.
Steve
Red Squirrel:
--- Quote from: LaserSteve on August 07, 2021, 08:20:35 pm ---Mcmaster.com Everything you want. Has a great search engine.
Steve
--- End quote ---
That's American unfortunately. I WISH we had something like that here.
I would make sure all plastics are similar. Both pieces I want to weld together are polypropylene which is recycle code 5. I just don't know if colour makes a difference as I probably won't find anything black. Though I could melt down the adapters i bought that did not fit, I only need to melt down the part with the threads, that should give me enough material to glue the hose part to the camlock.
I don't decide what kind of threads there are, they come in whatever they come in. If it was my choice it would just be camlock straight to a hose fitting. I did find one on amazon but it's like $90 and I don't really trust Amazon for something like that anyway.
Another option might be to try to cut some of the threads but it will be tricky trying to get a very straight cut, it needs to be straight so it can seal with the O ring. I can't screw it in far enough for it to get to the O ring since one set of threads is NPS and other is NPT. Could not find both in same thread format.
This looks promissing but not sure if the threads will match.
https://www.grainger.ca/en/product/REDUCER%20BUSHING,2%20X%203/4IN,MPTXFPT,P/p/WWG6MV71
Also not sure what they mean by "Fitting Connection Type MNPT x FNPT". Does it mean it *IS* a male to female or that it mates to a male and other end mates to a female? I need it to have a female thread since the camlock adapter (the one that does fit) is male.
I think the pic is also generic as the size does not look right but it's the same pic for lot of fittings.
This is what I have so far:
IBC tap:
The two fittings I attempted to use:
The camlock (one with metal locking mechanism) fits fine, but the other one can't thread all the way, it's NPS (can't find it in NPT) and I think the camlock is NPT (can't find in NPS).
So I'm thinking I will just find a way to weld a flat piece of plastic to end of camlock, then weld the hose connector part to the flat piece after drilling it out.
PaulAm:
Well you really want to do it your way, so go ahead.
15 seconds of searching got this page of camlock to male NPT adapters
https://www.cutandcouple.com/product/aluminum-female-camlock-x-male-npt/
Put female npt camlock in the search box, pick one of those, a reducing bushing, your hose fitting and you're done.
Red Squirrel:
That too is American. Also I already have that part, it's adapting that thread to 3/4" or 1/2" I need. That's the challenge, 99% of what I find online is not in Canada. By the time you account for exchange rate, customs, taxes etc it ends up prohibitively expensive. I've been hit with $600+ custom bills for a $100 items before, it's a gamble. It's a real pain trying to find specific stuff like this here.
Trust me I did lot of searching and the closest thing I found (what I already bought) is not working. So it's time for plan B.
Red Squirrel:
So I think I got this, it seems the trick is really the pipe dope, and just pure brute force to try to force them together and manage to turn it enough so that I can force it into the seal. it may not be ideal but so far so good. The second one I did, I put the pipe dope on the female threads (should have done that from the get go, just cleaner) then clamped that part down to a 2x4 that I can step on, then I used a screwdriver on the other part as it has a small area I can stick in it. This gave me more leverage to turn it. I was able to force the incompatible threads all the way to make the seal.
If I had many of these to do, I would probably look at building some kind of jig and just do it this way as it seems to work and these are the closest parts I can find in Canada that are at least semi compatible with each other. Time will tell if the connection stays and the seal continues to hold though.
The pics are of the first one where I was able to get it pretty far with pipe dope which kind of acted as a lubricant to get it to spin a bit more, but it leaks very slightly. (can see a little drop, that stayed that way for over a day without falling) but the 2nd set I did I was able to get it to hit the seal using the 2x4 and screwdriver for more leverage. It was a bit medieval but it worked.
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