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.