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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).
高级
Two days
说明
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.
此步骤所需材料：
硬木板1 个所需工具：
木工车床
6 英寸数显卡尺2
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.
此步骤所需材料：
铸造砂2 公斤
亚麻籽油0.1 升
面粉0.1 公斤所需工具：
烤箱3
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.
此步骤所需材料：
黄铜锭1 公斤
木炭1 as required所需工具：
砂型箱（上箱与下箱）
铁匠炉
耐火黏土坩埚
坩埚钳
钢锯
金属锉
皮革围裙
电焊手套
安全眼镜5
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.
所需工具：
台虎钳
丝锥板牙套装6 英寸数显卡尺6
6
Metal for a fitting
Metal for a fitting
正在加载 Jupyter 笔记本…
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.
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