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View Poll Results: Which crimp is better?
Crimp A 4 16.00%
Crimp B 8 32.00%
Either is acceptable 9 36.00%
Neither is acceptable 4 16.00%
Voters: 25. You may not vote on this poll

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  #1  
Old 09-06-2022, 09:48 PM
rv12is's Avatar
rv12is rv12is is offline
 
Join Date: Aug 2019
Location: Peachtree City, GA
Posts: 54
Default Rate my crimps

I'm getting ready to crimp some d-sub pins and have two crimpers to choose from. I'm not sure which crimper is the better option. So I crimped two test pins and examined them under the microscope. Despite the two crimpers looking very similar, the resulting crimps are definitely different.

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Which crimper would you choose? A or B? Is either acceptable? Or neither?
Crimp A:
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Crimp B:
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  #2  
Old 09-07-2022, 12:09 AM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
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Default

Either one looks good. I would strip the wire so the end of the insulation would press firmly against the barrel for support.
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  #3  
Old 09-07-2022, 04:44 AM
Bevan Bevan is offline
 
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Location: BC
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Default

Crimp B looks like it may have bent the barrel which may cause some difficulty in getting it seated into the connector body. My vote goes to A.

BYW, too much insulation has been stripped from both samples.

Bevan
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  #4  
Old 09-07-2022, 06:27 AM
PilotjohnS PilotjohnS is offline
 
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,532
Default Insulation

Both style of crimpers are OK (single of dual indentation)
Both have a tight wire bundle with no birdcaging of the wire.

But:

A has too much insulation exposed. Ideally you want just enough exposed so that one can see that no insulation shards are inside the barrel. B looks better in terms of insulation exposed. Too much can cause shorting either from adjacent wire or debris. And wire will birdcage easier during assembly or removal.

As others have mentioned, the barrel needs to be straight, if bent something went wrong.

Every barrel and every different wire size ( wire AWG) will need to have the crimper reset. The holder should have a chart with the tool setting based on wire guage.

I would not put the insulation up against the barrel; if this is done, then any flexing of the wire may tend to pull the stands out of the crimp.

The best source of information is the Garmin G3x installation manual. Free to all with an internet connection.

My rule is that all crimped pins must have the wire supported within a few inches of the crimp. This is usually accomplished with the back shell. When tying the crimped wires together, with no back shell, extra care must be taken so that one wire doesnt take all the stress from the bundle. I dont advise this in vehicles with vibration.
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Last edited by PilotjohnS : 09-07-2022 at 06:54 AM.
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  #5  
Old 09-07-2022, 06:42 AM
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rv8ch rv8ch is offline
 
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Default

Crimp A looks very good - I like the double crimps on it. Can you share with us what kind it is? All mine are like your B photos, but with a bit more insulation.
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  #6  
Old 09-07-2022, 09:15 AM
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rv12is rv12is is offline
 
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Default

Both crimpers are relatively cheap crimpers. This is why I wanted to do some test crimps to see how well they performed. I wasn't really paying attention to the insulation clearance, as my goal was to evaluate the performance of the crimper tool itself.

But since multiple comments were made on the insulation clearance, (and I had no idea what was appropriate) I looked into this some more. It appears that NASA specs (NASA-STD-8739.4A) specify a minimum insulation clearance of 0.01" and a maximum of 0.03".
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Is this an appropriate spec to be working to? If so, I measure the insulation clearance of A to be 0.035". So as many have suggested that distance is too far and should be reduced. On the other hand, crimp B would appear to be well within the specified range.
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  #7  
Old 09-07-2022, 09:20 AM
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rv12is rv12is is offline
 
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Quote:
Originally Posted by rv8ch View Post
Crimp A looks very good - I like the double crimps on it. Can you share with us what kind it is? All mine are like your B photos, but with a bit more insulation.
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The tool that produced the A crimp is the 4 way indent crimper sold by SteinAir. https://www.steinair.com/product/4-way-indent-crimper/ The B tool is a Greenlee PA1460.
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  #8  
Old 09-07-2022, 09:33 AM
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jneves jneves is offline
 
Join Date: Aug 2021
Location: Livermore, CA
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I'll vote for A. The double spread will put less stress in a single area, look at it as a back up. Also work on the stripping lengths so you have very little wire showing between the barrel and the insulation. Also crimping too tight is almost as bad as not crimping tight enough. This should be set on the crimper to ensure repetitive shrimps.
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  #9  
Old 09-07-2022, 09:37 AM
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jneves jneves is offline
 
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Quote:
Originally Posted by rv12is View Post
Attachment 30636
The tool that produced the A crimp is the 4 way indent crimper sold by SteinAir. https://www.steinair.com/product/4-way-indent-crimper/ The B tool is a Greenlee PA1460.
Crimper A has better force management from what I found, picked up the same one online when I did my wiring.
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JPI EMS-350 to monitor the temps
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  #10  
Old 09-07-2022, 09:42 AM
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fl-mike fl-mike is offline
 
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Quote:
Originally Posted by rv12is View Post
Attachment 30636
The tool that produced the A crimp is the 4 way indent crimper sold by SteinAir. https://www.steinair.com/product/4-way-indent-crimper/ The B tool is a Greenlee PA1460.
Send 'em both back and buy a used Daniels AFM8!
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