This is a subject that I am sure will bring many responses since an
entire book could be written on the subject.
First off, for the sake of clarity let me say that cleaning a
casting and finishing a casting could be viewed as two separate
Cleaning a casting involves removing the investment that was used in
the casting process and since this subject has been dealt with in
depth lately on Orchid I will assume you would like to know how to
finish a casting.
First the raw casting needs to be pickled to remove any oxides that
remain on the surface. Second the casting is removed with a saw,
or cut off wheel from the button and sprues.
From this point forward there are many different procedures for
finishing a casting depending on the finish you would like to
You may wish to file, sand, tumble, polish, hammer, hand texture,
burr texture, sand blast, engrave, satin finish, diamond wheel cut
and a whole list of other possibilities.
You must first know what you want your finished pieces to look like
and then you can choose the procedures that are needed.
If you don't want to purchase any equipment to do the finishing
process than a possibility would be to buy a set of files and various
grits of sand paper and emery paper from coarse to very fine and work
the piece to a satin finish and then buff.
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