tailieunhanh - Gas Burners for Forges Furnaces and kilns phần 9

sau đó thay thế nó với một kích thước 112-inch để làm tan chảy hai gam vàng. (3) đặc biệt nhiều kích thước bước khoan cho công việc của tấm kim loại có sẵn trong hầu hết các cửa hàng phần cứng. Họ đang rất phổ biến với các thợ điện, bởi vì họ cung cấp các kích thước lỗ chính xác và không mất rất nhiều không gian trong hộp công cụ. | Gas Burners then replace it with a 1 2-inch size to melt two grams of gold. 3 Special multiple size step-drills for sheet metal work are available in most hardware stores. They are very popular with electricians because they provide exact hole sizes and don t take up a lot of space in the toolbox. The better brands work well but are very expensive. A steel rated countersink will do the job as long as some extra attention is paid to the hole size as it is reamed out and it won t cost much more than a drill bit. Choose a counter sink that isn t a lot larger than the finished hole in order to get better visual cues. 4 The saber saw will be needed for the 5-inch exhaust opening if you don t wish to use the grinder to form it. It will also be needed for the burner collar opening if you don t wish to use a hole saw or do chain drilling. Chapter 10 Farrier s Forge 1 This hole saw is covered with brazed carbide particles. If it can t be found substitute a cheap wood cutting hole saw and consider it expendable. It will cut through the refractory but will be ruined in the process. Chapter I I Multi-hole Glass Furnace 1 This amount of sheet metal is only needed for the bead furnace configuration. Otherwise some scrap for the bellyband and top panels can be purchased from a salvage yard. 166 Glossary Acetylene C2 H2 A colorless highly flammable and explosive gas with a garlic smell. In its liquid state it is violently explosive and therefore it must be stored as a pressurized gas which is dissolved in acetone and the acetone held in a container filled with non-reactive materials that act as a buffer against physical shock. When acetylene gas is allowed to form at any pressure over 15 PSIG it can rapidly degrade and form explosive by products remember the pressurized acetylene in the tank is dissolved in acetone but when you draw it from the tank it is not . Opening and closing of an acetylene cylinder s valve should be done slowly to avoid producing shock. Acetylene has the .