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twearthling
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ÂÂ 2014-02-27, 07:32 PM #11
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ÂÂ 2014-02-28, 12:45 AM #15
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ÂÂ 2014-02-28, 12:54 AM #16
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ÂÂ 2014-02-28, 03:58 AM #18
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General requirements for type-metal

Type metal should produce a true and sharp cast, and reproduce the matrix in all detail. The dimensions and form should be correct after cooling down.

Type metal should be strong and lasting, to endure wear and pressure while printing.

Type metal should be easy to cast, this means: a reasonable low melting temperature, iron should not dissolve in the molten metal, mould and nozzles should stay clean and easy to maintain.

The molten metal should be clean, while molten it should give as little dross as possible, to prevent loss of tin and antimony.

The economics have to be taken in account too: keeping the costs down would mean: keeping the content of tin and antimony as low as possible, and maintaining a high quality of the type produced.

Type metal should not adhere to the copper of the matrix.
ÂÂ 2014-02-28, 09:45 AM #19
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