Workshop Technology Questions

• Sheet-metal tooling — where is clearance provided in piercing? In press-working, “piercing” creates a hole in the sheet by pushing a punch through the material. For piercing, the engineering clearance is normally provided on which tool element?
• Foundry sand properties — name for the ability of grains to stick together In moulding practice, which property term describes the tendency of sand grains to stick together due to bonding action, enabling the mould to retain its shape?
• Limits & fits notation — interpreting “100 H6/g5” According to Indian/ISO system of limits and fits, what does the designation “100 H6/g5” indicate about the dimension?
• Casting practice — purpose of a pattern in mould making In foundry work, is a pattern used to create the mould cavity that will later receive molten metal during casting?
• Uniform sand packing in large moulds — which machine is used? To achieve uniform and consistent ramming of moulding sand throughout large mould cavities and around cores, which equipment is preferred?
• Oxy-acetylene flames — identifying the oxidising flame Is the following statement correct? “An oxidising flame resembles a neutral flame, but its inner cone is shorter and less luminous (more pointed), indicating excess oxygen.”
• Oxy-acetylene welding — temperature at the inner luminous cone of a neutral flame In gas welding practice, what is the approximate temperature at the tip of the inner luminous cone for a neutral oxy-acetylene flame?
• Moulding machines — achieving harder sand at the back and softer at the pattern face Which machine is used when the foundry requirement is to compact the sand harder at the back of the mould and relatively softer near the pattern face?
• Foundry pattern colour coding — identifying unmachined surfaces In standard pattern-marking practice, which colour is used to indicate surfaces that will be left unmachined on the final casting?
• Gas flames — approximate temperature of an oxy-hydrogen flame What is the typical maximum temperature produced by an oxy-hydrogen flame under normal welding conditions?
• Press tool design — clearance location for blanking During a blanking operation (where the blank is the required product), where is the die–punch clearance provided for correct sizing?
• Sheet-metal terminology — meaning of embossing The operation of producing raised or sunken impressions of letters, numbers, or decorative designs on sheet-metal parts is called:
• Arc welding — typical temperature range of an electric arc In manual metal arc or similar arc welding processes, the temperature in the arc column is generally of the order of:
• Bench tools — how a hacksaw blade is specified In fitting practice, a hand hacksaw blade is primarily specified by which characteristic?
• Casting defects — identifying defects due to poor venting Which casting defect specifically results from improper venting of the moulding sand, causing trapped gases within the casting?
• Metal forming practice — terminology of forging operations In hot or cold forging, the specific operation that increases the cross-sectional area (diameter or thickness) of a bar or rod at the expense of its length is called:
• Bulk deformation processes — accurate definition of extrusion Which statement best describes the extrusion process used to produce uniform sections such as rods, tubes, and profiles?
• Casting defects — identifying sand wash In foundry practice, the defect termed “sand wash” refers to which observable condition on a casting?
• Product geometry from extrusion — what sections are typically produced? The metal extrusion process is most commonly used to produce which type of cross-sections?
• Casting of pipes — selecting the correct process Cast iron and steel pipes of uniform cylindrical shape are commonly produced by which casting method?