UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
Copper and Brass Tube Drawn from Strip
Jewellers make tube from flat strip: the strip is curled into a gutter, then pulled through the shrinking holes of a drawplate, which closes it into a round tube with a seam along it. Drawn over a steel rod, the bore comes out the rod's size. The seam can be silver-soldered for a sealed tube. Copper and brass are both drawn this way, annealed between draws.
Ophakathi
Half a day
Imiyalelo
1
1
Strip width
Strip width
Ilayisha incwadi ye-Jupyter…
2
2
Cut the strip
Cut the strip
Mark and cut a straight strip of annealed copper or brass sheet to the width, and taper one end to a point over 2 cm. File the long edges square.
Izinto zokwakha zalesi sinyathelo:
Ishidi Lethusi0.01 sqm
Ishidi Lethusi Eliphuzi0.01 sqmAmathuluzi adingekayo:
Insimbi Yokudweba Imigqa
Isikeli sensimbi
Iqoqo Lamafayela
I-Caliper Yedijithali Yamayintshi Ayi-63
3
Curl it
Curl it
Lay the strip over a groove in the swage block and hammer a steel rod down on it so it curls into a U along its whole length; close the tapered end round the rod by hand.
Amathuluzi adingekayo:
Ibhulokhi elinezimbobo lokubumba
Induku yensimbi yokubumba
Isando esinekhanda eliyindilinga4
4
Draw it closed
Draw it closed
Wax it and pull it through the drawplate with the seam facing up, starting in a hole that just takes it. Go down the holes until the edges meet; draw over the steel rod to size the bore.
Izinto zokwakha zalesi sinyathelo:
Isibabule Sezinyosi5 gAmathuluzi adingekayo:
Ipuleti lokudonsa ucingo lensimbi
Udlawu lokudonsa
Isibambo SebhentshiInduku yensimbi yokubumba5
5
Anneal between draws
Anneal between draws
Anneal at a dull red and quench whenever it stiffens.
Izinto zokwakha zalesi sinyathelo:
Amanzi5 amalithaAmathuluzi adingekayo:
Isibani Se-propane
Isitini somlilo
Udlawu lomkhandi wensimbi
Ibhakede lokupholisa6
6
Solder the seam
Solder the seam
For a sealed tube, flux the seam and run silver solder along it with the torch. Pickle and rinse.
Izinto zokwakha zalesi sinyathelo:
Isoda Lesiliva2 g
Ifulaksi5 gAmathuluzi adingekayo:
Isibani Se-propaneIsitini somlilo
Izibuko zokuphepha7
7
Trim and measure
Trim and measure
Cut off the tapered end, file the ends square and measure the outside diameter.
Amathuluzi adingekayo:
Iqoqo LamafayelaI-Caliper Yedijithali Yamayintshi Ayi-68
8
Troubleshooting
Troubleshooting
Tube drawing troubleshooting.
Flow
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Izinto
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