UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Oqalayo
An afternoon
Imiyalelo
1
1
Cut the conductors
Cut the conductors
Cut one copper wire per conductor (four for a bridge), a little longer than the cable.
Izinto zokwakha zalesi sinyathelo:
Ucingo Lwethusi4 lengthAmathuluzi adingekayo:
Isihlubuli sikawaya2
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.
Izinto zokwakha zalesi sinyathelo:
Intambo Yekotini1 as requiredAmathuluzi adingekayo:
Isibambo Sebhentshi
Ibhola lesandla
Isikelo3
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.
Izinto zokwakha zalesi sinyathelo:
Isibabule Sezinyosi1 as requiredAmathuluzi adingekayo:
Amabhodwe amabili okupheka emanzini
Ipuleti Elishisayo4
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.
Amathuluzi adingekayo:
Isibambo SebhentshiIbhola lesandla5
5
Cover the bundle
Cover the bundle
Wind an outer layer of cotton over the twisted bundle and wax it again.
Izinto zokwakha zalesi sinyathelo:
Intambo Yekotini1 as requiredIsibabule Sezinyosi1 as requiredAmathuluzi adingekayo:
Isibambo SebhentshiAmabhodwe amabili okupheka emanziniIpuleti Elishisayo6
6
Test it
Test it
Strip the ends. With a multimeter check each wire end to end, and check that no two wires touch.
Amathuluzi adingekayo:
Isihlubuli sikawaya
Isilinganisi sikagesi esiyinhlanganisela7
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.
Izinto
3- 4 lengthIsibambeli
- 2 as requiredIsibambeli
- 2 as requiredIsibambeli
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