THE considerations involved in the successful machining of aluminium and its alloys have sprung into particular prominence during the last year or so with the greatly increased use of these materials under the armaments expansion programme. Numerous firms who have hitherto confined their attentions to steels and non‐ferrous metals like brass and copper arc now engaged in the mass production of parts machined from extruded, rolled and cast aluminium and aluminium alloys. These light metals are by no means difficult to machine but their particular properties require a special technique if full advantage is to be taken of the economy resulting from the high speed at which they may be worked.
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