December 6, 2012

One important crimping consideration in addition to verifying tensile
strength is to confirm that the crimp tool used was used in a manner to
ensure full ratchet action of the tool was achieved as required by the
IPC workmanship standards.  Some air operated crimp tools can be set to
different pressure settings.  Normally, for air operated crimp tools, to
achieve full ratchet action the tool is set to a specific pressure
depending on the tool used (e.g., 90 PSI).  However, if the tool is set
at a lower pressure (e.g., 60 PSI) you will get a crimp that is not
fully formed but it may or may not still pass tensile testing, depending
on the type of wire and lug used.  The lower pressure setting would
violate the IPC standards since less than full tool ratchet action would
occur.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: Thursday, December 06, 2012 9:59 AM
To: [log in to unmask]
Subject: Re: [TN] Crimp tensile strength

Molex crimping tool instructions include information on measuring crimp
tensile strength.  I haven't checked but would expect Tyco/Amp also to
have the information.  It's the only way to verify a "good" crimp has
been made.

One item of interest: we recently had a problem with consistent crimps
of a Molex terminal.  The documentation was of no help.  The technician
noticed that the "V" grove that the terminal is placed into prior to
closing the handles of the tool seemed worn.  There are two such groves
in the tool and the other one (for smaller gauge wire)  had never been
used so that made it obvious there was a problem.  The terminals would
roll a bit to one side or the other before the tool closed. 

The documentation says nothing about the groves but clearly they are a
significant feature of the tool.

A few minutes with a triangle file restored the grove.  The tool again
yielded 100% good crimps.

Bob Landman

On Dec 6, 2012, at 1:48 AM, Inge Hernefjord <[log in to unmask]>
wrote:

> JF, je vais vouz envoyer offline " The Crimping Handbook". /Inge
> 
> On 30 November 2012 14:03, JF <[log in to unmask]> wrote:
> 
>> Hi all,
>> 
>> I'm trying to find a chart to evaluate crimp quality. This chart was 
>> about "Crimp tensile strength". Can't remember what it was.
>> 
>> Thanks for any help!
>> 
>> JF
>> 
>> ______________________________**______________________________**_____
>> _____ This email has been scanned by the Symantec Email 
>> Security.cloud service.
>> For more information please contact helpdesk at x2960 or 
>> [log in to unmask]
>> **______________________________**__________
> 
> 
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud
service.
> For more information please contact helpdesk at x2960 or 
> [log in to unmask] 
> ______________________________________________________________________
> 

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud
service.
For more information please contact helpdesk at x2960 or
[log in to unmask]
______________________________________________________________________

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________