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

TOPIC: Rated speed of Niehoff MWD

Rated speed of Niehoff MWD 3 months 4 weeks ago #3055

Dear Sir, I am fresher to a cable company. In my company in first few months of my stint I have observed that the Niehoff MWD machines are running at around 75% of the rated speed, whenever I asked someone they always give a vague reply. Can any one suggest at what optimum speed an Niehoff MWD machine can run at of rated speed?
Last Edit: 3 months 3 weeks ago by Mr Monojit Deb.
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Rated speed of Niehoff MWD 2 months 4 weeks ago #3062

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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Rated speed of Niehoff MWD 2 months 1 week ago #3064

Dear sir,
Thank you for your reply we use MMH101 and we do drawing of bare annealed copper. Definitely sir the speed reduces with higher sizes as annealer is the constraint therefore why I have asked about the rated speed and the rated speed is different for different sizes..
Last Edit: 2 months 1 week ago by Peter J Stewart-Hay.
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Rated speed of Niehoff MWD 2 months 1 week ago #3067

Hello Mr Monojit Deb,

There is a very simple answer to this:

In a word, the limitation is called horsepower.
Regards,
Peter J. Stewart-Hay Principal
Stewart-Hay Associates
www.Stewart-Hay.com
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Rated speed of Niehoff MWD 2 months 1 week ago #3068

Dear Peter Sir,
Yes I have got it. Thank you for your clarification. It would be very much helpful if you please help me with the other query I have posted regarding pressure variation in Dancer of MMH101.Is it normal to get 20 kg more in net weight in the bobbin than the sample weight observed? And whether it is correct practice to not maintain pressure according to Niehoff standard?
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Rated speed of Niehoff MWD 2 months 2 days ago #3074

Dear Mr. Deb:
If you increase the wire you will stretch the wire and you OD becomes smaller. You are losing some anneal or rather elongation as well. For sure the higher dancer weight will give you a denser package, but you or your customer could also have problems with unwinding or flying the wires of for the next process. Therefor it is recommended to stay within the value provided by Niehoff. These values differ by wire size and type of take-up and calculated that you should not have any high stretching and maintain your wire OD.
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