How would you solder this?

Discussion in 'Technical Repair' started by mr1001nights, Jun 6, 2017.

  1. mr1001nights

    Thread Starter New Member

    Jun 6, 2017
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    So one of the cables in my desktop CNC (Nomad 883) tore. So I bought my 1st soldering iron from Amazon (Jajaplus 17 in1) to fix it. I watched a few youtube vids and practiced stripping and soldering 2 small wires I had around, and it was fine. However, what I have to repair only has 1 longer wire, and it is hard to keep it in that hole and make a good connection, especially while having to put any pressure with the tip to melt the wire. I'm using the smallest tip from the kit. Any tips or suggestions? Also, once it is soldered back together, can I use some DAP contact cement gel in that area to make sure it doesn't tear again the future? Thanks

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  2. SLK001

    Senior Member

    Nov 29, 2011
    1,307
    510
    Don't solder. Buy the insert, clean up the wire (clip off old and strip off cover to reveal new wire) and recrimp.
     
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  3. jterblanche

    New Member

    May 14, 2017
    17
    7
    Sometimes the insert can be removed, opened and re-crimped.
     
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  4. mr1001nights

    Thread Starter New Member

    Jun 6, 2017
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    Thanks, my friend is not a soldering newbie like me and says he could do it. But recrimping would be cleaner right?
     
  5. SLK001

    Senior Member

    Nov 29, 2011
    1,307
    510
    It's not a question of being able to do it. If it was soldered, it would simply fail again within a couple of useages (especially if the connector moves). A crimped connection is far superior to a soldered connection.
     
  6. takao21203

    AAC Fanatic!

    Apr 28, 2012
    3,682
    491
    Use a broad tip and fill the hole first then tin the wire then join the two. Use good amount to solder. If you can, recrimp.
     
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  7. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    4,048
    1,774
    You need to remove the pin, clean out the old broken wires. You can solder or crimp, which ever gives you the best connection on a "pull" test.
     
  8. dendad

    Distinguished Member

    Feb 20, 2016
    2,646
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    Definitely do not use the smallest tip! That is a big mistake a lot of people make. Small tips have very little use as they cannot deliver enough heat to the work. Soldering wires like that needs a bigger tip, but that does not mean a really high temperature. It just means the tip will retain its heat and not be cooled by the work. A length of wire like that is a good heatsink.
    Looking at the Amazon picture, I'd use the middle tip.
    It looks like those plastic tabs can be carefully bent away from the body a little and the contact slid out.Then if you can, open up the crimp and take the old wire out. Insert new wire and re crimp and/or solder it.
     
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  9. mr1001nights

    Thread Starter New Member

    Jun 6, 2017
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    Thanks everyone for the suggestions. The Nomad technical support guy told me that he didn't know what crimp connectors those are, so suggested that I simply add a little goop of solder to the connector, which is the same thing that takao had said, and then to twist and tin the cable & solder it to the connector. My very 1st job ever. It was messy. Not sure if the solder went deep enough inside the hole and if it's going to work. I'll check if the connection works in a bit, after I've secured it w some tape, glue or something. I'd need to add a strain relief too.

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    Last edited: Jun 7, 2017
  10. mr1001nights

    Thread Starter New Member

    Jun 6, 2017
    4
    0
    Fixed! It works!!! pffuiii I feel relieved. I added some contact cement, connected it to the motor, and made a cable strain relief out of gorilla tape

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  11. dendad

    Distinguished Member

    Feb 20, 2016
    2,646
    702
    It looks like you fixed it ok. Well done!
    I hope it keeps working for you.
     
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