A technique for the manufacture of cast gem lapping discs / L. S. Knudsen
โดย: Knudsen, L.S.
ผู้แต่งร่วม: Thailand Institute of Scientific and Technological Research
Language: English ชื่อชุด: Class. Invest. no. 10ข้อมูลการพิมพ์: Bangkok : Thailand Institute of Scientific and Technological Research, 1971 หัวเรื่อง: Gems | Manufactures | Polishingสาระสังเขป: A technique has been developed which enables the local fundries, with only samll investment in new equipment, to produce gem grinding discs. The technique includes moulding in green sand with appropriate gates, risers and sprue; melting of mottled iron in the local low sheft furnace, and superheating and alloying of the metal in an oil-fired crucible furnace. The technique is now ready for transfer to a foundry.
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