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Wing Nut: Sand-Cast in Brass, Drilled and Tapped
A wing nut has two wings so it can be turned by hand without tools. The standard (ASME B18.6.9) sorts them by how they are made: cold forged, hot forged, die cast or stamped from sheet. In a workshop the cast kind can be made by sand casting brass from a wooden pattern, then drilling and tapping the hole. Method and sizes are ours.
The picture: our drawing.
中级
1 day
说明
1
1
Make the pattern
Make the pattern
Saw and file a hardwood pattern: a round boss 16 mm across and 12 mm high with two flat wings rising from opposite sides, 40 mm tip to tip. Taper every face a little so it draws from the sand. Make several nuts at once from one mould.
所需工具：
硬木块
钢丝锯（曲线锯）
锉刀套装
6 英寸数显卡尺2
2
Ram the mould
Ram the mould
Ram the patterns up in the flask, draw them, and cut a sprue and runners to each cavity.
所需工具：
铸造砂
铸造砂箱
手铲3
3
Melt and pour
Melt and pour
Melt the brass in a clay crucible in the furnace and pour the mould full in one go. Let it cool.
此步骤所需材料：
黄铜锭300 克
木炭1 as required所需工具：
深腹黏土坩埚
砖砌炉
风箱
坩埚钳
电焊手套
皮革围裙
面屏4
4
Clean up
Clean up
Shake out, saw off the runners and file the wings smooth and the boss faces flat.
所需工具：
钢锯
台虎钳锉刀套装5
5
Drill and tap
Drill and tap
Drill the boss through square to its face with the tapping drill for M8 (6.8 mm), then tap M8 with cutting oil. Check it runs on M8 threaded rod.
所需工具：
台钻
钻头套装台虎钳
丝锥板牙套装
丝锥扳手
切削油
全螺纹杆
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