the process. Once the drill site Drilled holes are Help For most The chips must has been selected characterized by learners students, and surveyed, a their sharp edge on master it's boring, exit out of the hole contractor or the entrance side materials created by the contractors will and the presence of at their and move in with burrs on the exit own pace. cutting. equipment to side (unless they Good drill Chip exit can prepare the location. have been and Lacks the If necessary, the site removed). Also, the practice cause problems will be cleared and inside of the hole provides leveled. A large pit usually has helical feedback that when chips are will be constructed feed marks. to "hands-on large and/or to contain water for students, learning" drilling operations explains provides, continuous. and for the disposal how to get and The drill can of drill cuttings and the It has no other waste. A small correct application wander upon drilling rig, referred answer, in the entrance and for to as a dry hole and student's differ, will be used contains a deep holes. to start the main i.e. hole. A large rarely will For deep holes in diameter hole will be system to the large workpieces, drilled to a shallow keep track student depth and lined with of student make the coolant may need conductor pipe. progress. connection to be delivered They can with why be used to these through the drill build things are shaft to the cutting confidence important as more front. answers are correctly provided Plastics bottles and containers of Hollow thermoplastic Intricate shapes can be High initial set- all sizes and shapes e.g. fizzy tube is extruded between formed up cost because moulding drinks bottles and shampoo bottles a split mould and Can produce hollow the mould is Polymers used: clamped at both ends shapes with thin walls expensive HDPE, LDPE, PET, PP, PS, PVC Hot air is blown to the Ideal for mass production parison which expands it to take the shape of the mould Once cooled product is ejected by opening the split mould
the process. The chips must exit out of the hole created by the cutting. Chip exit can cause problems when chips are large and/or continuous. The drill can wander upon entrance and for deep holes. For deep holes in large workpieces, coolant may need to be delivered through the drill shaft to the cutting front. Once the drill site has been selected and surveyed, a contractor or contractors will move in with equipment to prepare the location. If necessary, the site will be cleared and leveled. A large pit will be constructed to contain water for drilling operations and for the disposal of drill cuttings and other waste. A small drilling rig, referred to as a dry hole differ, will be used to start the main hole. A large diameter hole will be drilled to a shallow depth and lined with conductor pipe. Drilled holes are characterized by their sharp edge on the entrance side and the presence of burrs on the exit side (unless they have been removed). Also, the inside of the hole usually has helical feed marks. Help learners master materials at their own pace. Good drill and practice provides feedback to students, explains how to get the correct answer, and contains a system to keep track of student progress. They can be used to build confidence as more answers are correctly provided For most students, it's boring, and Lacks the that "hands-on learning" provides, and It has no application in the student's i.e. rarely will the student make the connection with why these things are important moulding Plastics bottles and containers of all sizes and shapes e.g. fizzy drinks bottles and shampoo bottles Polymers used: HDPE, LDPE, PET, PP, PS, PVC Hollow thermoplastic tube is extruded between a split mould and clamped at both ends Hot air is blown to the parison which expands it to take the shape of the mould Once cooled product is ejected by opening the split mould Intricate shapes can be formed Can produce hollow shapes with thin walls Ideal for mass production High initial set- up cost because the mould is expensive
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