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

TOPIC: Pressure variation in Dancer of MMH101

Pressure variation in Dancer of MMH101 2 months 1 week ago #3066

Dear Sir,
We use a Niehoff model MMH 101 and draw bare annealed copper. Is it correct practice to vary dancer pressure to control weight of the product beyond the recommended pressure given by Niehoff? I have observed that when I am checking a sample after increasing the air pressure beyond the prescribed limit it is correct .When the bobbin is filled up, the sample weight is correct but the net weight of the bobbin is about more than say 20 kg, So should we keep the pressure always within the prescribed limit?
Last Edit: 2 months 1 week ago by Peter J Stewart-Hay.
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Pressure variation in Dancer of MMH101 2 months 1 week ago #3070

Dear Mr. Monojit Deb;

First please understand that a dancer controlling a bare wire take up performs two separate functions:

1) It holds tension on the dry capstan thereby preventing wire slip on that dry capstan or annealer capstan and thus prevents wire burn off.
2) It controls the SPEED of the take up itself. The air pressure also regulates the wire tension as it is spooled but if set too high, it can and will stretch the wire.


Using the air pressure to further reduce the wire diameter is not a good thing because it not positive and thus not controlled.

I suggest, if possible, that you find a proper air pressure setting within the Niehoff range appropriate to your operation.
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.
Last Edit: 2 months 1 week ago by Peter J Stewart-Hay.
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The following user(s) said Thank You: Mr Monojit Deb

Pressure variation in Dancer of MMH101 2 months 1 week ago #3071

Dear Sir,
Thank you for such a quick reply. Really very much thankful to you for helping me out. Yes I will be taking trial on that only in 1-2 days. I will fix the pressure according to standard and use die according to the requirement,but doing so we cannot keep both pressure and die diameter constant, to maintain weight we cannot use all dies of same diameter we may need to change few and use dies of smaller size keeping pressure constant as we cannot keep both constant, so if we use few dies of smaller diameter will it have any negative effect on the overall product?
Last Edit: 2 months 1 week ago by Mr Monojit Deb.
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Pressure variation in Dancer of MMH101 2 months 2 days ago #3075

You need to check your dancer pressure setting from time to time with a tension gage. Air operated cylinders have wear and since the dancer mostly rides in the middle you have more wear here and this will change the wire tension. Once or twice a year is enough.
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Pressure variation in Dancer of MMH101 2 months 2 days ago #3076

Dear sir,
If I am setting a pressure during starting a Job and getting a desired pressure how come the pressure changes in the middle of the bobbin the cylinders may wear with time but can the pressure vary in between the bobbin because of this wear in the cylinders? Can you also please guide me which tension gauge should be used to check tension and how to find variance after checking tension?
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