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  • Rolf D Wurmbach replied to the topic 'Rated speed of Niehoff MWD' in the forum.
    Dear Mr. Deb
    What kind of Niehoff multiwire drawing machine you have, there are three types, MMH50, MMH101, or MMH121? The MMH50 is for fine wire and the other two are larger wire sizes.
    The speed you can run depends also on what material you are running. If you run e.g. tin plated copper wire it is good practice to reduce the speed by 20%.
    In some case the annealer or the take up is the limiting factor. Most annealers are designed for a constant throughput, with other words a certain pounds per hour. If you run larger sizes the speed is less since you have larger throughput and would require a higher current that the annealer may not designed for.
    Depending what reels you are using they may slow down your speed as well. It’s all depending on the barrel size, where a higher line speed would exceed the max rpm of your take up.
    Rolf
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    kunena.post 2 days ago
  • Ms Christel Robin Willson replied to the topic 'Wire Buncher Troubleshooting' in the forum.
    Thank you ever so kindly! My next step is to procure a tension meter that is capable of conducting readings on moving wire to ensure the tensions are consistent.
    Read More...
    kunena.post 10 days ago
  • kunena.thankyou 10 days ago
  • kunena.thankyou 10 days ago
  • Willy M Hauer replied to the topic 'Wire Buncher Troubleshooting' in the forum.
    Hi Christel,

    Are you using dynamic(pintle type) pay-offs of flyer?

    A double twist machine can be a highly productive machine but requires rather precise input:


    Wire diameter
    Residual elongation
    Wire tension (pls note that a tension differential is required between layer)
    Closing die quality
    Clear and clean wire path in the machine itself
    Correct correlation between pay-off tension and bow speed


    Best Regards,

    Willy
    Howar Equipment Inc.
    Read More...
    kunena.post 11 days ago
  • Peter J Stewart-Hay replied to the topic 'Wire Buncher Troubleshooting' in the forum.
    Hi There Ms Willson,

    Lets go over some of the basics first:

    1) If the pay-offs for the single wires on the strander are not driven, then the pay-off brakes create a torque and, as the pay-off reels go down, the individual wire tensions go up. This is all very normal but all the individual wires must have the same metallurgical composition and properties. That includes elongation. There can be no mixtures of hard and annealed wires in the same seven wire strand. Measure each of the wire tensions so that all are typically the same or quite similar.

    2) Make sure all the pay-off reels are in good shape, balanced and ready to be used properly.

    3) Make sure that the seven wire pay-off reels typically have the same amount of wire on each of them so that the individual wires twist properly when they close at the buncher.

    4) It is important that each of the pay-off pintles are completely free turning and that the wires are properly wound on the pay-off reels. Turn each empty pay-off pintle carefully by hand to ensure there are no hang-ups or other strange intermittent torque effects. Have maintenance repair those pintles that are below standard and recheck by hand.

    5) Make sure that the wire path to the buncher closing point is smooth and free of spots where the wires could hang up.

    6) Make sure that the 7 wire bunched strand has a smooth and free wire path through the buncher and on to the take-up. Everything counts!

    Now you are ready to run a trial on your 7 wire bunched strander.
    Read More...
    kunena.post 11 days ago
  • Ms Christel Robin Willson created a new topic ' Wire Buncher Troubleshooting' in the forum.
    I am currently investigating a spike in the weight of 4ft samples coming off the bunch strander. Seven reels are utilized to create 7-strand wire of resulting gages 6, 12, and 14. Four reels are created by each set of 7. The issue lies with the fourth reel of each set. The weight of samples typically decreases a little from reel 1 to reel 3, then the 4th reel spikes in weight. My speculation thus far concerns the annealing process and the tension. Is it possible that this is just the result of hard wire present at the inner-most layer of wire on the reel? What others factors might I consider - possibly increasing tension resulting in increased elongation? Readings do show that the flyer tension is not exactly the same among the set of seven.
    Read More...
    kunena.post 12 days ago
  • groups Clint Cannon joined the group Nonferrous