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Nonferrous topics such as copper and aluminum, annealing, etc. go here.

TOPIC: Variation in weight in the spool with respect to i

Variation in weight in the spool with respect to i 4 months 2 days ago #3079

Hello Everyone,

We are having weight variation in the take up bobbins. For example, Lets say The sample weight of Take up A is 7.78 gm/m. and for take up B is 7.79 gm/m. After filling 100 km in the bobbins, the net weight of Take up A should be near about 778 kgs and take up 2 should have 779 kgs. But we are having a net weight of 790 kgs (12 kgs more) in take up A and 792 kgs (13 kgs more) in the take up B.

How is this extra weight coming in the bobbins?? We have kept the standard dancer pressure, used almost similar dies. Then what is playing in it to increase the net weight of the bobbin??

Note: Some of the machines are giving almost equal net weight with respect to the sample weight.
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Variation in weight in the spool with respect to i 3 months 3 weeks ago #3081

Hello Mr Suman Roy,

You have a measurement issue that is really difficult to solve.

SINCERELY,
Regards,
Peter J. Stewart-Hay Principal
Stewart-Hay Associates
www.Stewart-Hay.com
This email address is being protected from spambots. You need JavaScript enabled to view it.
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Variation in weight in the spool with respect to i 1 month 3 weeks ago #3104

  • Richard Burke
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First I would weigh each of my bobbins to determine their weight. Perhaps the dies on the second machine are wearing faster than on the first machine. Also if you take a meter of wire at the beginning of the spool and at the end of the spool and they are still 7.78 and 7.79 then I would suspect that you have more meters of wire on the second bobbin than your linear counter is indicating or less on #1. 1% error on either or both would account for the difference.
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