- About me
- A university trained Professional Mechanical Engineer, registered in the Province of Ontario, Canada.
A wire and cable manufacturing engineering specialist with over 35 years hands on experience.
- Dear Mr. Bogahawatte,
Your question cannot be answered because:
A) We have no idea of what and where your country is.
We have no idea of what country and where your customers of oil resistant cables are, plus what oils and solvents they need your cables to be resistant to.
C) You will then have to find out what specification your customers want your cables tested to. Then go buy the test equipment and start testing.
- Hello there Mr. Yahya arr;
The items that you call "cylindrical things" are frequency filters, designed to let the cable channels that one is paying for pass through while the other channels are blocked. The reason you are having difficulty removing a cable filter is that the cable company does not want people cheating by removing them and thus getting all the channels, most of them, for free. It requires a special tool, owned by the cable company, to remove a filter.
If you are certain that your T V set is ok and that the cable filter has failed, the cable company then must replace it as it is part of their system.
Quit playing around with your splitter and go after the cable company again.
- Peter J Stewart-Hay replied to the topic 'Additives in insulation and effect on voltage drop' in the forum.Hello Mr. Tobias D.
First of all, please be aware that the electricity does not jump between the individual wires in the strand. The electricity instead runs along each individual wire in the helix.
Secondly and as far as North America (USA and Canada) is concerned, the conductivity of the copper is determined by the hardness of the copper and the amount of trace metals in the copper. For example, Nexans Canada used to have a trace amount of silver in the copper and thus the conductivity was a little bit better than 100%.
Thirdly the conductivity is determined by the conductivity as well as the dimensions.
If you are terminating by clamping a copper conductor dirty surface to a tinned copper bar there could be differences in the electrical resistivity. Likewise, there are two different methods for coating a tinned copper bar. The best method is by electro-plating. The poorer method is by hot dipped tin. There are other factors such as the compression of the conductor on the tinned copper bar.
Finally, PVC is a mixture of chemicals and fillers and is often mixed and pelletized at each wire and cable company. The PVC formulations are generally the Intellectual property of the wire and cable company and thus not readily available.
I strongly recommend that you eliminate all the other conductivity issues before attempting to go after the wire and cable companies.
- Hello Again Mr. Mohsen Ajalloueian
With the exception of one response almost six months ago, our very expert magnet wire individual, Mr. Richard Burke is no longer available as a technical resource at the Forums. His next to last entry is over a year old. Despite a number of tries, we have been unable to communicate with him. We sincerely hope he and his family are OK and indeed in good health and spirits.
We therefore direct your query to Mr. Burke's former favorite magnet wire die manufacturing company. This company has over 70 years of magnet wire experience and hopefully should be able to give you the information you require.
Bettner Wire Coating Dies, Inc.,
P O Box Number 872
Columbus, Indiana, 47202 USA
Tel: 812 372-2732
Fax: 812 372-6355
Mr. H E Bettner is the President and Mr. M. Bettner is the Vice-President of Manufacturing
Make sure you let them know the metals and your enameling line speeds, the wire pre-heating process and temperatures on the wire entering the enameling machine, the type of enameling machines you are using, and the style of the dies you are using. (Brass split dome style, Steel split dome style, or Doghouse style.) Likewise, let them know if you are using in-line drawing at enameling.
Later let us all know what you found out. Thank you.
Sorry I cannot be of more help.
- Hello again Zamuir,
When I discussed the temperature of the wire entering the annealing leg of the annealer, I was referring to the preheating leg or legs of the annealer itself. The temperature wire as it exits the drawing machine is not the issue.