[TriEmbed] Is anyone here a JST Connector Wizard

[Trampas Stern]

I should note that you need to bend the terminal 90 degrees before crimp
when using larger terminals that are not the first set of dies on the
crimper.  As such I always just bend them 90 as part of my process.
I use several different JST connectors (XH, PH etc) so I pick the die based
on the terminal and wire size.

Also if you want perfect crimps you need to mark the wire before inserting.
You can not see how far the wire goes into the terminal before crimping. I
inserted mine too far in the image above.  As such you can use marker to
mark wire length or take time to be more accurate than I was on the depth.


You can also buy wire leads from digikey pre crimped:
https://www.digikey.com/en/products/filter/jumper-wires-pre-crimped-leads/453?s=N4IgTCBcDaIFYGcAuACADgCxQdwJYCcBTFAG0IEMATBEAXQF8g
I usually recommend that people buy these pre-crimped leads where possible,
however I still crimp my own.


Trampas

On Wed, Jun 26, 2024 at 5:53 PM Trampas Stern <trampas at gmail.com> wrote:

> Rick,
>
> I do quite a few JST crimps and here is what I found works best for me.
> Note I have tried every crimper I could find, the engineering ones and
> others.  I found the process of setting up the terminals to be the key to
> success. It is not a fast process but I have had good results.
>
> I use this crimper, but many are the same:
> [image: image.png]
>
> Then I prepare the terminal, first cut off the leader near the terminal to
> be used:
> [image: image.png]
>
> Bend the terminal to be crimped 90 degrees as shown below:
> [image: image.png]
>
> Insert into the crimper and close as shown, these crimpers lock in this
> position and often the insulation wings are a bit wide and I have to
> squeeze them before installing in the crimper.
> [image: image.png]
> Then I insert the stripped wire.
> [image: image.png]
>
> After the crimp I break the terminal and wire from the leader, while doing
> a pull test.
> [image: image.png]
>
>
> Trampas
>
>
>
> On Wed, Jun 26, 2024 at 5:37 PM Rick DeNatale via TriEmbed <
> triembed at triembed.org> wrote:
>
>> I’m convinced that these things are the invention of the devil!
>>
>> Despite my best efforts, I’d guess i have about a 20% yield crimping JST
>> terminals.
>>
>> I’ve bought several crimping tools.
>> https://www.amazon.com/gp/product/B01N4L8QMW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
>>  and
>> https://www.amazon.com/gp/product/B078WNZ9FW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 were
>> recommended by various YouTube videos.
>>
>> The second one works a bit better unlike the first it has you crimp the
>> electrical contact first and then the mechanical crimp around the
>> insulation.
>>
>> My big problem is that the insulation crimp often doesn’t form
>> correctly.  Instead of wrapping around the insulation the wings just stick
>> out straight.
>>
>> Then either the terminal comes off the wire while removing the “tape”
>> part, or when trying to to insert the terminal in the plastic shell.
>>
>> Is my problem with the terminals? I’ve been buying kits from Amazon.
>> Would i be better off with a different vendor like Digikey?
>>
>> Any advice gladly appreciated.
>>
>> ——
>> Rick DeNatale
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>>
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