Epee B-line not working

Discussion in 'Armory - Q&A' started by jkormann, Jun 17, 2017.

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  1. jkormann

    jkormann Podium

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    Without warning, the epee stopped registering. Brought it home from club, tested the two lines. The A-line is fine, the B-line doesn't move the needle. Disassembled it and checked the wires from the socket to the blade, they look Ok, and a tug-test didn't result in a loose wire. The barrel is still tight.

    Could the wire have separated in the barrel and not visible?
     
  2. dcchew

    dcchew Podium

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    At first glance, you may have broken the B wire at the crimp connection between the contact pin and the wire. It's not an uncommon occurrence. It may be the time for a rewire job.
     
  3. SJCFU#2

    SJCFU#2 Podium

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    Another possibility (which you may want to check before rewiring) is that the contact spring isn't necessarily making contact with the B contact, either due to uneven contacts down inside the barrel or a bent, twisted or otherwise uneven contact spring. In the case of the former, you might be able to push the A contact back down with a pin-punch or even a point setter (depending on the tip or wire). In the case of the later, replace the contact spring (they're cheaper than a new wire, and easier to replace). You may also consider trying a new tip (strange things can happen when a tip has a small crack in it which may still be too small to be visible without magnification).

    Eliminate the easy things first (even if they appear to be long shots) before thinking about rewiring (which you may end up doing anyway, but at least you won't have to be wondering if you aren't doing a lot of work for a simple, easily-fixed problem).
     
  4. jkormann

    jkormann Podium

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    That was one of my first thoughts. Sticking a multimeter probe down the barrel is what showed the A-line works fine, but the B-line is dead.

    Other than take it apart, is there a way to check if it's the a crimp-problem?
     
  5. K O'N

    K O'N Podium

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    If I understand you correctly, you have already taken the tip out and the grip, socket and bell guard off the weapon. So you're testing a wired blade by putting a meter on the bare wire on one end and a probe into the barrel on the other. Correct?

    If that's the case and you still have no connection on one line, the only two places left for trouble are a pinched/sheared wire inside the spaghetti wire, if it's still installed, and a pulled loose wire under the cup in the barrel. Eliminate the first by taking the spaghetti wire off and looking for a break. Failing that, I think you have to rewire. Sometimes you can get it working again by sticking a screwdriver down the barrel and rotating the cup 45 or 90 degrees, but it's a temporary and tenuous fix at best. You're half way there, just fix the thing. Re-wire it and get back to fencing.
     
  6. jkormann

    jkormann Podium

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    Yeah, I hate rewiring blades..
    Thanks for the advice, all.

    Edit: Tried K's suggestion, rotated the cup 1/8 clockwise and both A and B lines are working. I'm going to reassemble, but start looking at a rewire.
     
    Last edited: Jun 17, 2017
  7. Fairfield_Fencing_Armory

    Fairfield_Fencing_Armory Rookie

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    If the wire showed no continuity at first and then when you rotated the cup you got continuity, it would seem that the wire is broken and that rotating the cup has made the two broken ends come back into contact.
    The weapon will probably be finicky and inconsistent.
     

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