Propeller casting. Start with cope, drag, pattern and pattern board.
|Place pattern board between cope and drag sections. Apply parting dust lightly over pattern.|
|Completely cover pattern with fine riddle.||Completely covering the pattern using the fine riddle will insure fine detail.|
|Fill the rest of the drag using a coarse riddle. Flush to the top (see next photo).||Ram outside edges of mold using a ramming paddle. This prevents leaks during pouring.|
|Ram with peen side of rammer. North to south then east to west. Not real hard, but evenly.||Then fill the mold (without riddling), to about 2 inches over the top.|
|Then ram with the butt side of rammer (harder ram).||Strike off mold leaving a small amount of loose sand to cushion bottom board.|
|Place board on drag section and flip the entire unit over.||Remove cope section (empty) and pattern board from mold.|
|Propeller is mostly buried. Sand must be cut down to parting line. The equator of the Earth is a good example, separating the 2 halves of the mold at the "parting line".||Cut down to the parting line and then smooth the sand with your spoon to insure separation from the cope.|
|Mark the location of your sprue by slightly pressing the cutter into the sand.||Place cope section on mold. Apply parting dust to mold, this will keep cope and drag separated.|
|Cover the pattern using the fine riddle.||Fill remainder of cope with the coarse riddle and tuck edges with paddle rammer (same as drag).|
|Ram mold east to west and then in a north to south pattern. Gentle but firm. Same as drag.||Fill cope 2 inches above top and ram with butt side of rammer. Then cope is struck off and slicked smooth with a trowel.|
Continued on: Step- By- Step 2
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