zielsicher Englisch, Metalltechnik, Schulbuch

Prepare a short presentation of one of the fasteners. Describe the joining element, but don’t mention its name, explain what you do with it. The others must guess its name. Re-create the situation from the lesson introduction and perform a role play. Work with a partner. Try to involve as many terms as possible from task 01. Work in groups of four and prepare a short presentation. Prepare a short presentation about your topic. The others take notes. Screwing connections Screws are the most common joining elements. They are easy to detach and reusable, without leaving any damage to the compound. Screws have diffe- rent kinds of threads. They are classified by the shape of the screw head and their application area. Nuts are equally classified. Washers are supposed to make an even contact area for the screw/bolt head or nut. Different head shapes of screws and bolts hexagon head cap bolt – cheese head bolt – countersunk screw – slotted screw with longitudinal slots – slotted screw with cross slot Application areas of screws and bolts close tolerance bolt – studbolt – threaded pin – sheet metal screw – thread cutting screw – thread forming bolt – self-tapping drilling screw – wood screw Pin connections, bolts and different types of pins Pin connections are also used for shearing. Bolts are mainly used for hinge joints or in machine components such as track rollers and sheaves. Dowel pins are used to fix the position of a component. Shearing pins are used as a predetermined breaking point. Fixing pins are used to connect components. Look back at task 09 and talk to one of your classmates about quick fastening systems. Ask questions about how quick fastening systems are divided. Take turns. With a partner, look back at task 08. Make a list of the different welding techniques. Search the internet and try to find two facts for each technique. You can write down advantages or disadvantages, things you need for doing it, materials it is suitable for, or whatever you find important. 10 A2 Well, it is a fastener, which is not detachable but fixed. Two or more parts are connected; the parts are accessible from either one side or from both sides. Is it a rivet? Is it a … Yes, it is. No, it isn’t. 11 A2–B1 12 A2–B1 13 A2–B1 14 B1 138 Unit 26 Interaction Nur zu Prüfzwecken – Eigentum des Verlags öbv