How does crimping work?
in [Repair]
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From: whit3rd on 30 Nov 2009 18:58 On Nov 30, 3:26 pm, "Dave Plowman (News)" <d...(a)davenoise.co.uk> wrote: > In article <7nili3F3mc6v...(a)mid.individual.net>, > Trevor Wilson <tre...(a)SPAMBLOCKrageaudio.com.au> wrote: > > > Most connectors are brass - to give more strength. Cable usually > > > copper. > > **Only cheap, crappy crimps are brass. For copper wire, crimps should be > > copper. > > Depends on the use. I'd say the most common crimp terminals are in some > form of spring loaded contact. And those tend to be made of brass Phosphor bronze or beryllium copper are the springy metals in common use (it may LOOK like brass...). A well-made crimp requires lots of thought about materials. Commonly, copper stranded cable works, a copper stranded cable with a couple of SS strands works, a copper solid cable of the same gage doesn't work... and don't even TRY to crimp to a SS cable with 'electronic' tools and lugs. Even the professionals get it wrong sometimes (Al wire is just fine with the right electrode paste and crimp lugs, but has a bad reputation). When amateurs get 'kits' and pliers at the dollar store, the result isn't pretty.
From: PeterD on 30 Nov 2009 19:00 On Mon, 30 Nov 2009 18:28:28 +0000 (GMT), "Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote: >In article <fh38h5931qpafh0rdpom1qpa9n3bn2epvp(a)4ax.com>, > PeterD <peter2(a)hipson.net> wrote: >> >But most of the crimped terminals you come across - like say in a car or >> >computer - are brass, but sometimes plated. > >> Cite a reference. > >Try cutting one open. That tells you nothing about the metal... Again, cite a reference.
From: Sylvia Else on 30 Nov 2009 19:41 Rich Webb wrote: > On Mon, 30 Nov 2009 23:54:12 +1100, Sylvia Else > <sylvia(a)not.at.this.address> wrote: > >> The obvious answer is that you bend the metal of the connector so that >> it holds the wire in place. >> >> This doesn't seem very satisfactory. Metal always retains some >> flexibility, even when bent beyond its yield point. No matter how hard >> you squeeze, there'll be some rebound when you release the pressure, >> which should result in a loose joint. >> >> After having had a bad experience trying to crip a lug some years ago, I >> recently faced the need to do this again. So I bought a moderately >> expensive ratchet based crimping tool. And, rather to my surprise, it >> actually works. >> >> But that doesn't answer the question of how. > > Because the wire bundle inside the crimp also rebounds? It probably does, but the wide bundle is being subject to compression, whereas the connector is subject to both compression and bending. I'd expect a certain degree of unbending when the compression is released. Sylvia.
From: Dave Plowman (News) on 30 Nov 2009 19:46 In article <7nj3mqF3m9jbuU1(a)mid.individual.net>, Trevor Wilson <trevor(a)SPAMBLOCKrageaudio.com.au> wrote: > > Depends on the use. I'd say the most common crimp terminals are in > > some form of spring loaded contact. > **We're discussing CRIMP terminals. Like this: > http://www.ami.ac.uk/courses/topics/0119_crmp/index.html > Copper is the material, not brass. Heavy duty electrical ones may be - but the most common ones like in computers and cars are brass. -- *He who laughs last, thinks slowest. Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Dave Plowman (News) on 30 Nov 2009 19:47
In article <d3n8h59kal7te33ioo1jkvrnetlcfjtqd1(a)4ax.com>, PeterD <peter2(a)hipson.net> wrote: > >> Cite a reference. > > > >Try cutting one open. > That tells you nothing about the metal... Again, cite a reference. Do you know the colour of copper? -- *Forget the Joneses, I keep us up with the Simpsons. Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound. |