Erik Quackenbush has entered with an answer to #10
10. Casting is the art of pouring molten metal (hot!) into a mold to
form a shape. Forging is the art of banging on a solid (usually hot)
piece of metal to bend it into shape. Machining is the art of using a
cutting tool (usually with a lathe or milling machine) to trim a piece
of metal to shape. In general, forged parts are stronger than cast parts
but they cost more to make. Forging is a good way to make connecting
rods. Parts with internal passages are usually. Casting is a good way to
make cylinder heads. Parts that are JUST machined (carved from a billet
of solid metal) are the most expensive to make but not the strongest.
Machining is a good way to make ONE of something. In real life most cast
and forged parts have surfaces that that must be machined to make them
useful (bores, decks, journals, etc.)
4 more to go...
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