Download PDF by C. Ammen: complete book of sand casting

By C. Ammen

ISBN-10: 0830698418

ISBN-13: 9780830698417

Describes the sand foundry, the features of molding sand, the kinds of mildew and trend making apparatus, and a number of the sand casting strategies for forming metals.

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Additional info for complete book of sand casting

Sample text

CORE MIXES The following is a list of core mixes that I have used for a number of years with good success. % parts Wheat flour. Air float sea coal parts Rosin. 1part For small castings New molding sand ........................................... 15 parts Sharp sand.. 5 parts 1part Linseed oil ............................................... ........................................ ................................................... VENT .................................................. ..................................................

The time required varies with the bulk of the core. A large core might take several days to bake or a small core might bake out in an hour or less. When an oil core is completely baked the outside is a rich dark brown not black or burned. The core must be cured completely through with no soft centers. Only experience and trialand error will teach you how to bake cores. One thing for sure, if they are green they can be baked longer until done, but if you burn them up too bad. Start over. It is common practice to hollow out large cores to decrease the baking time and assure an even bake throughout.

Cope not deep enough. 102 Riddle sand into the drag. Place about a half shovel of molding sand in a #4 riddle. The riddle is held parallel to the flask and 6 to 8 inches above. The riddle is held on each side by placing the fingers just under the bottom side of the riddle, holding the riddle loosely, just supporting it on your finger tips. The sand is shook through the riddle by more of a rocking motion of the wrists which causes the riddle to hit the heel of first one hand then the other. This bumping back and forth against the heels of the hands is what does the job, not swinging the riddle back and forth like a pendulum.

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complete book of sand casting by C. Ammen


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