IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Brass Fittings: Sand-Cast on a Core, Then Tapped
Couplings, elbows, tees and nipples for pipes are cast in brass around a sand core that forms the bore, then threaded. Turn a wooden pattern with core prints at the ends, bake oil-bonded sand cores, cast in green sand, and tap or die-cut the threads.
The picture: a wooden core box with its sand cores (left), and the pattern with the finished casting (right).
Ilọsíwájú
Two days
Ìlànà
1
1
Turn the patterns
Turn the patterns
Turn a wooden pattern of each fitting a little oversize for shrinkage and machining, with a stub, the core print, at each open end. Make a split wooden core box for the bore.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Pátákó Igi Líle1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìyí igi
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 62
2
Make and bake the cores
Make and bake the cores
Mix sand with a little linseed oil and flour, pack it into the core box, scrape it level and bake the cores in an oven at 200–250 °C until hard.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Iyanrìn ìdàsílẹ̀2 kg
Òróró Ọ̀gbọ̀0.1 lítà
Ìyẹ̀fun0.1 kgÀwọn irinṣẹ́ tí a nílò:
Ààrò3
3
Mould and pour
Mould and pour
Ram the pattern in green sand in the flask as in the sand casting blueprint. Lift the pattern, set the cores in the prints left by the core prints, close the flask and pour the brass, melted outdoors in a crucible in the charcoal forge.
4
4
Knock out and fettle
Knock out and fettle
When cool, break out the sand and the cores, saw off runner and riser and file the castings clean.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìṣù idẹ1 kg
Èédú1 as requiredÀwọn irinṣẹ́ tí a nílò:
Àpótí àwòṣe iyanrìn (òkè àti ìsàlẹ̀)
Ìléru alágbẹ̀dẹ
Ìkòkò Amọ̀ Tí Ń Kojú Iná
Ẹmú Ìkòkò Ìyọ́
Ayùn Irin
Ìfá Irin
Aṣọ Ìdílé Awọ
Ìbọ̀wọ́ wẹ́lídìn
Gíláàsì ààbò5
5
Thread them
Thread them
Hold each fitting in the vise and cut inside threads with the tap, outside threads with the die, using a little oil. Check them on a pipe.
Àwọn irinṣẹ́ tí a nílò:
Ìdìmú Tábìlì
Ìtò irinṣẹ́ ìgé iháÒṣùwọ̀n Kálípà Díjítà Ìnṣì 66
6
Metal for a fitting
Metal for a fitting
Ń ṣí ìwé Jupyter…
7
7
Limits
Limits
Cores and core prints as Wikipedia describes them; the oil-and-flour binder and the sizes are ours. Melt brass outdoors: it gives off white zinc-oxide smoke.
Àwọn ohun-èlò
6- 1 ẹyọÀyè
- 2 kgÀyè
- 0.1 lítàÀyè
- 0.1 kgÀyè
- 1 kgÀyè
- 1 as requiredÀyè
Àwọn irinṣẹ́ tó nílò
14- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
CC0 Àgbègbè Gbogbogbò
Blueprint yìí ti jáde lábẹ́ CC0. O lè ṣe àdàkọ, yí padà, pín, àti lò láìsí ìyọ̀ǹda.
Ṣàtìlẹ́yìn Olùṣẹ́dá nípa rírà àwọn ọjà nipasẹ̀ Blueprint wọn Ẹ̀san Olùṣẹ́dá tí àwọn Olùtajà gbé kalẹ̀, tàbí ṣẹ̀dá àtúnṣe tuntun ti Blueprint yìí kí o sì fi sínú Blueprint rẹ gẹ́gẹ́ bí ìsopọ̀ láti pín owó-wíwọlé.