How does crimping work?
in [Repair]
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From: Sylvia Else on 30 Nov 2009 19:56 Sjouke Burry wrote: > Sylvia Else 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. >> >> Sylvia. > The crimp wire squishes the corners of the pin so intensely, > that a gas-tight connection forms, 4 for each winding. I think you're referring to wire wrapping, which is something else. Sylvia.
From: Dave Plowman (News) on 30 Nov 2009 20:15 In article <00903a8b$0$23492$c3e8da3(a)news.astraweb.com>, Sylvia Else <sylvia(a)not.at.this.address> wrote: > > The crimp wire squishes the corners of the pin so intensely, > > that a gas-tight connection forms, 4 for each winding. > I think you're referring to wire wrapping, which is something else. It's the case too with a properly made crimp. Which very few are outside of the factory. There's no such thing as a universal crimp tool - each connector and cable requires a special for the very best results. -- *Time flies like an arrow. Fruit flies like a banana.* Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Rheilly Phoull on 1 Dec 2009 01:30 "Sylvia Else" <sylvia(a)not.at.this.address> wrote in message news:00cd76f9$0$32362$c3e8da3(a)news.astraweb.com... > 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. There may be some expansion on release of the crimping pressure but the interior of the crimp junction is still under pressure. Regards ........ Rheilly P
From: Jasen Betts on 1 Dec 2009 03:05 On 2009-11-30, PeterD <peter2(a)hipson.net> wrote: > On Mon, 30 Nov 2009 17:56:29 +0000 (GMT), "Dave Plowman (News)" ><dave(a)davenoise.co.uk> wrote: > >>In article <4b13f3e6$1(a)dnews.tpgi.com.au>, >> F Murtz <haggisz(a)hotmail.com> wrote: >>> Dave Plowman (News) wrote: >>> > In article<4b13c243$1(a)dnews.tpgi.com.au>, >>> > F Murtz<haggisz(a)hotmail.com> wrote: >>> >> Usually the conductor is the same metal as the lug, it will have the >>> >> same memory so if it is all squished it should stay there.Expanding >>> >> and contracting in use at the same rate. (maybe) >>> > >>> > Most connectors are brass - to give more strength. Cable usually >>> > copper. >>> > >>> crimp lugs are usually copper for copper wire >> >>Perhaps lug means some special terminal in the US? >> >>But most of the crimped terminals you come across - like say in a car or >>computer - are brass, but sometimes plated. > > Cite a reference. http://nz.farnell.com/tyco-electronics-amp/0-0165536-1/crimp-terminal-pidg-faston-positive/dp/4215631
From: Dave Plowman (News) on 1 Dec 2009 05:33
In article <b06cb5a9-8c0d-4d8e-a980-5ddef60712af(a)p19g2000vbq.googlegroups.com>, whit3rd <whit3rd(a)gmail.com> wrote: > > 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...). Could well be - I've not had it analyzed. But it certainly doesn't look like copper. ;-) Of course it could be all these sort of things are copper in the US. I can only speak for the ones I'm familiar with in the UK. -- *It ain't the size, it's... er... no, it IS ..the size. Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound. |