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Cope and Drag Flask: Oak Frames with Iron Pins and Lugs
A moulding flask holds the sand of a casting mould in two halves, the cope on top and the drag below; pins and holes line them up again after the pattern is taken out, and bars across the cope hold the sand, which is weak in tension. Flasks may be steel, aluminium or wood. Make two oak frames, cross bars for the cope, and forged iron lugs with pins and holes.
The picture: the two halves of a sand mould, opened, with their lugs and pins.
中级
A day
说明
1
1
Two frames
Two frames
Saw and plane oak into eight sides, about 10 cm deep, and nail them into two identical square frames about 30 cm inside (our size). Check them square.
此步骤所需材料：
硬木厚板2 个
铁钉24 个所需工具：
手锯
手刨
直尺规
横向楔头锤2
2
Bars in the cope
Bars in the cope
Nail two cross bars inside the top frame (the cope), set back from its parting face, to hold the sand.
此步骤所需材料：
硬木厚板1 个铁钉8 个所需工具：
手锯横向楔头锤3
3
Lugs and pins
Lugs and pins
Forge four flat lugs from iron bar: two with a hole punched through for the cope, two with a short round pin standing up for the drag. Rivet a pair on opposite sides of each frame, lined up so the pins pass through the holes.
此步骤所需材料：
锻铁条1 个
铁铆钉8 个
木炭2 as required所需工具：
铁匠炉
铁砧
热冲子
铁匠钳
手摇钻
金属锉4
4
Try the fit
Try the fit
Close the frames on the pins and turn them over: they must come apart and close in exactly the same place. File the pins until they do.
所需工具：
金属锉5
5
Sand to fill it
Sand to fill it
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