. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . ders attention is called to the series of photographsrepresenting the process of making a sand mould froma simple one-piece pattern, that of a face plate to be usedon a small lathe or drill press. Small castings aremoulded in a ^^flask, which in its plainest form consistsof two rectangular frames resting upon a loose piececalled the bottom board. The upper frame is called the ii Pattern Slaking cope/ and the lower is kno^vn as tlie ^^dra< loa *^m
. Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional . ders attention is called to the series of photographsrepresenting the process of making a sand mould froma simple one-piece pattern, that of a face plate to be usedon a small lathe or drill press. Small castings aremoulded in a ^^flask, which in its plainest form consistsof two rectangular frames resting upon a loose piececalled the bottom board. The upper frame is called the ii Pattern Slaking cope/ and the lower is kno^vn as tlie ^^dra< loa *^moulding board, Avliicli for onr purpose may be con-sidered a duplicate of the *^bottom board, is also pro-vided. In the photographs the ^^flask is represented bytwo wooden frames resting upon a bottom board. Aregular flask, however, would be larger than this andof more complicated construction, being provided withguide pins between cope and drag, so that they will alwaysfit together properly, cope ^*bars, handles, etc., and theyare often built of iron. For the purpose of simplificationall such details are omitted from the pictures. Sections. Fig. 64—(Above). Pattern exposed and piece moulded in placerig. 65—(Below). Pattern withdrawn and two-piece pattern held together with dowel pins called ^cheek pieces are sometimes introduced betweencope and drag for producing complicated castings and anumber of pieces are usually moulded in one flask, whichis partitioned off for the purpose. While the procedurethat follows may not always be adhered to in regularfoundry practice, the beginner by so constructing his pat- 104 • Model Engineering *^ terns that they can be moulded by snch a series of opera-tions is assured of good results. Our face plate pattern will first be placed upon the^moulding board, flat side down, as in Fig. 62A, thenthe drag, shown, on end, behind the moulding board, isplaced over it as in Fig. 63A, and filled with mouldingsand which is ^*rammed down and smoothe
Size: 1994px × 1253px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidmodelmakingi, bookyear1919
