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UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
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UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
Iron Sheet Hammered Out from Bar
Before rolling mills, iron plate for cauldrons and griddles was hammered out of bar by hand. The bar is spread sideways with the hammer's peen, flattened with the face, then planished with a flatter until it is an even sheet two to three millimetres thick.
The picture: a cauldron of riveted iron plates from Vendel, Uppland, Sweden (Swedish History Museum, SHM 7250:XI).
Osezingeni eliphezulu
A day
Imiyalelo
1
1
Heat the bar
Heat the bar
Bring the wrought iron bar to a bright yellow-orange.
Izinto zokwakha zalesi sinyathelo:
Insimbi yokukhandwa eyinduku1 kg
Amalahle1 as requiredAmathuluzi adingekayo:
Iziko lomkhandi wensimbi
Udlawu lomkhandi wensimbi
Amagilavu okushisela
Izibuko zokuphepha2
2
Spread it with the peen
Spread it with the peen
Strike with the cross peen running along the bar, so the grooves push the metal out sideways. Flatten the ridges with the face. Turn it over and repeat. Reheat as soon as it dulls.
Amathuluzi adingekayo:
Insimbi Yokukhandela
Isando esinekhanda elimise okwesikhonkwaneUdlawu lomkhandi wensimbiAmagilavu okushiselaIzibuko zokuphepha3
3
Thin it evenly
Thin it evenly
Work outward from the middle, peen then face, until the plate is about 3 mm. Fold nothing: a fold will not weld back flat.
Amathuluzi adingekayo:
Iziko lomkhandi wensimbiInsimbi YokukhandelaIsando esinekhanda elimise okwesikhonkwaneAmagilavu okushiselaIzibuko zokuphepha4
4
Planish with a flatter
Planish with a flatter
With a helper on the sledge, set the flatter on the hot plate and planish the hammer marks out. Check it flat with a straight edge and the thickness with the caliper.
Amathuluzi adingekayo:
Ithuluzi lokwenza kube yisicaba
Isando esikhuluInsimbi Yokukhandela
Isilinganiso esiqondile
I-Caliper Yedijithali Yamayintshi Ayi-6Amagilavu okushiselaIzibuko zokuphepha5
5
Trim the edges
Trim the edges
Cut ragged edges off with a cold chisel on the anvil while it is still warm.
Amathuluzi adingekayo:
Isisebenzi sensimbi ebandayoInsimbi YokukhandelaIsando esinekhanda elimise okwesikhonkwaneAmagilavu okushiselaIzibuko zokuphepha6
6
How much sheet a bar gives
How much sheet a bar gives
Ilayisha incwadi ye-Jupyter…
Amathuluzi Adingekayo
11- Isibambeli
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