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Multi-Conductor Cable: Cotton-Covered, Waxed and Twisted
A cable of several insulated wires in one bundle, such as the four leads of a strain-gauge bridge. Each copper wire is wrapped in cotton thread and soaked in beeswax, then the wires are twisted together and covered again.
初学者
An afternoon
说明
1
1
Cut the conductors
Cut the conductors
Cut one copper wire per conductor (four for a bridge), a little longer than the cable.
此步骤所需材料：
铜线4 length所需工具：
剥线钳2
2
Wrap each wire in cotton
Wrap each wire in cotton
Clamp one end in the vise and the other in the hand drill's chuck, keeping it taut. Wind cotton thread on in a close spiral with no gaps, then a second layer the opposite way.
此步骤所需材料：
棉线1 as required所需工具：
台虎钳
手摇钻
剪刀3
3
Soak in beeswax
Soak in beeswax
Melt beeswax in a double boiler and draw each covered wire slowly through it. Wipe off the excess and let it set.
此步骤所需材料：
蜂蜡1 as required所需工具：
双层隔水锅
电热板4
4
Twist them together
Twist them together
Lay the covered wires side by side, clamp one end and twist them together evenly with the drill.
所需工具：
台虎钳手摇钻5
5
Cover the bundle
Cover the bundle
Wind an outer layer of cotton over the twisted bundle and wax it again.
此步骤所需材料：
棉线1 as required蜂蜡1 as required所需工具：
台虎钳双层隔水锅电热板6
6
Test it
Test it
Strip the ends. With a multimeter check each wire end to end, and check that no two wires touch.
所需工具：
剥线钳
万用表7
7
Limits
Limits
Cotton insulation is only good for low temperatures, up to about 105 °C (Wikipedia, Magnet wire), and for dry places and low voltages such as instrument leads. The method is general workshop practice, ours.
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