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tonyrenshaw268(at)gmail.c Guest
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Posted: Mon Feb 17, 2014 4:06 am Post subject: Nicopress Sleeves |
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Gidday,
Quick question….why can’t I tidy up a nicopress and squeeze it 90 degrees rotated after the first squeeze, to tidy the compress? If the first squeeze is correct, the second squeeze shouldn’t disturb the consequences of the first, should it??
Tony R.
Sydney Aussie
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grahamsingleton(at)btinte Guest
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Posted: Mon Feb 17, 2014 4:16 am Post subject: Nicopress Sleeves |
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Tony
don't see why not but get a second opinion!
Graham
From: Tony Renshaw <tonyrenshaw268(at)gmail.com>
To: europa-list(at)matronics.com
Sent: Monday, 17 February 2014, 12:04
Subject: Nicopress Sleeves
--> Europa-List message posted by: Tony Renshaw <tonyrenshaw268(at)gmail.com (tonyrenshaw268(at)gmail.com)>
Gidday,
Quick question….why can’t I tidy up a nicopress and squeeze it 90 degrees rotated after the first squeeze, to tidy the compress? If the first squeeze is correct, the second squeeze shouldn’t disturb the consequences of the first, should it??
Tony R.http://forums.matronics  tronics.com/contribution" target="_blank">http://www.matronics.com/contri================
[quote][b]
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rowlandcarson(at)gmail.co Guest
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Posted: Mon Feb 17, 2014 5:21 am Post subject: Nicopress Sleeves |
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On 17 Feb 2014, at 12:04, Tony Renshaw wrote:
Quote: | Quick question….why can’t I tidy up a nicopress and squeeze it 90 degrees rotated after the first squeeze, to tidy the compress? If the first squeeze is correct, the second squeeze shouldn’t disturb the consequences of the first, should it??
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Tony - I'd very much hesitate to do anything outside the recommended practice.
The security of the sleeve depends on the ductile copper flowing into the surface of the cable.
The thing with copper is that it work-hardens, which is one of the reasons that the Nicopress people require that the 3 crimps using their tool be done in a specific order. If you re-work an already-worked piece of copper, you could be cracking it because it's no longer as ductile. Or, you could be loosening the grip of the sleeve by trying to push the copper at 90 degrees to the first compression.
If you're using one of the screw-down tools that compresses right across the sleeve, I'd suggest that you be happy with the result after the first full closure, and not try to fiddle with it.
There's some very good stuff about all aspects of terminating cables in a recent (Dec 2013) Kitplanes article. Here's the URL I use to read it, but you may not be able to get there if you are not a Kitplanes subscriber:
http://www.kitplanes.com/issues/30_12/builder_spotlight/fabricating_cables_20888-1.html
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
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tonyrenshaw268(at)gmail.c Guest
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Posted: Mon Feb 17, 2014 1:00 pm Post subject: Nicopress Sleeves |
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Hi Rowland,
Thank you for your reply. I only vaguely remember the 3 crimps. I have a big squeezer, like a set of bolt cutters. It has about 5 positions, so you choose the one you want, position a little out each side as it is nominally shorter than the nicopress, hold the cable tight, and squeeze.
The issue I have is that we are squeezing things into a circle, and one could think that you wouldn’t be disturbing anything if you squeezed the small amount of Nicopress that exudes out the jaws of your tool, back into the circle. The other portions of the circumference shouldn’t be unduly pressured, as they are already compressed to the inner diameter.
I just struggle with the logic.
Still, I have a test tool, and they fit correctly now that they have been squeezed, so they are correct. Ironic that there is a small link in the tailwheel setup that has a double nicopress on each end of a 5” link. Don’t know why that is, considering by rights you shouldn’t need a second nicopress.
I’m about to go off and have a look at the link you gave me, and cross my fingers that it works down under, or that I am not a subscriber. Thanks for digging it out anyway. I think I may have a written reference here at home somewhere that talks about these things, but on first look I couldn’t find it, so that is why I asked the list, for that collective wisdom.
Thanks again.
Regards
Tony Renshaw
On 18 Feb 2014, at 12:20 am, Rowland Carson <rowlandcarson(at)gmail.com> wrote:
Quote: |
On 17 Feb 2014, at 12:04, Tony Renshaw wrote:
> Quick question….why can’t I tidy up a nicopress and squeeze it 90 degrees rotated after the first squeeze, to tidy the compress? If the first squeeze is correct, the second squeeze shouldn’t disturb the consequences of the first, should it??
Tony - I'd very much hesitate to do anything outside the recommended practice.
The security of the sleeve depends on the ductile copper flowing into the surface of the cable.
The thing with copper is that it work-hardens, which is one of the reasons that the Nicopress people require that the 3 crimps using their tool be done in a specific order. If you re-work an already-worked piece of copper, you could be cracking it because it's no longer as ductile. Or, you could be loosening the grip of the sleeve by trying to push the copper at 90 degrees to the first compression.
If you're using one of the screw-down tools that compresses right across the sleeve, I'd suggest that you be happy with the result after the first full closure, and not try to fiddle with it.
There's some very good stuff about all aspects of terminating cables in a recent (Dec 2013) Kitplanes article. Here's the URL I use to read it, but you may not be able to get there if you are not a Kitplanes subscriber:
http://www.kitplanes.com/issues/30_12/builder_spotlight/fabricating_cables_20888-1.html
in friendship
Rowland
| Rowland Carson ... that's Rowland with a 'w' ...
| <rowlandcarson(at)gmail.com> http://www.rowlandcarson.org.uk
| Skype, Twitter: rowland_carson Facebook: Rowland Carson
| pictures: http://picasaweb.google.com/rowlandcarson
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