- 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.
- Hello Mr. Lua,
We had a discussion about this before.
At that time you indicated that you had purchased a 25 mm elongation tester but that the maximum length between the jaws was only 24.9 mm.
I, as moderator, replied as follows:
"If there is a tolerance on the length of the conductor in the tester itself, it will be in your Standard. I suggest you look up the Standard and read it carefully. If the Standard does not allow a tolerance, then the tester must be modified."
This is still a valid answer as the Standard will clearly define the exact sample distance between the jaws of the elongation tester along with other requirements. We presume you require this for certified test reports to be sent to your customers.
- Hello again,
When you are bunching wires make sure:
- The mechanical properties of the wires are all the same. (Diameter, degree of anneal and so on.)
- The pay off tensions are all the same.
- The angles from the pay offs to the buncher are gentle and very similar. (No kinks or broken wire.)
- Copper bunching is a very good and economical method of producing smaller gauge copper conductor for something say like multi-strand house wire.. The double twist bunching process produces a poorer quality conductor so stay with single twist bunching machines.
To answer your questions:
1 - Properly manufactured bunched strand will produce good cable quality.
2 - Properly bunched strand will have no wires sticking up, no broken wires and no kinks in the wires or the conductor.
3 - Mechanically speaking, I have already given you the answers. Electrically speaking, there are no issues so long as the conductor has the proper dimensions and conductivity.
I also suggest you visit WAI Store on the left hand side of this page and purchase the Nonferrous Wire Handbook, Vol. 3. This will be a really great reference for you.
- Hello Mr. Rodriguez,
In my experience, one of the keys to double twist bunching is to have all the wires making up the bunch at the same pay off tension. Another is to have all the wires making up the bunch at the same diameter or very close to the same diameter.
You have three different sizes of wire, each with their bending properties and pay off tensions. I think you should be closing the insulated wires on a small rigid strander.
If you persist in using a double twist machine, you are, I believe, breaking new ground so all I can say is; "Good luck!"
- Hello Chuck,
Did you read Mr. Burke’s Thread at the Website/Beta Testing Feedback Division at the Forums. You are the only moderator.
Mr. Burke brings up a very good point. The iPad (All Apple Portable Devices) does not use flash and that seems to be a prerequisite for the Forums. Could you please E-mail us both back to advise the fix, the timing or the work around.