zielsicher Englisch, Metalltechnik, Schulbuch

Work with a partner. Complete the text with words from the Word bank. You may also search the internet for information. Take turns; compare your results in class. The dimensions of two components have to fit together in the joined area. The inner part is the  bore  , the outer part the  shaft  . Because of the choice of the tolerance classes of bore and shaft, either a  positive allowance  or  negative allowance  is the result. The difference between the dimensions of the bore and the shaft specifies the fit. There are three types of fit: Loose fit The minimum size limit of the bore is always larger; in a  limit case  , it is equal to the maximum size limit of the shaft. Medium fit Depending on the actual size of bore and shaft, the  result  at joining is either a positive allowance or negative allowance. Interference fit The  maximum  size limit of the bore is always smaller; in a limit case, it is equal to the minimum size limit of the shaft. Work in groups of three. Go back to the texts in task 04 and find examples from your practical work where these types of tolerance are used. You can also use the internet for help. Present your findings to the class. 1: Tolerance specification due to general deviation 2: Tolerance specification due to ISO-tolerances 3: Tolerance specification due to deviation limits Ask a classmate questions like this one about the three different tolerances. Take turns; you may use your book for help. 08 A2–B1 Word bank actual size Istmaß bore Bohrung fit Passung interference fit Übermaßpassung limit case Grenzfall loose fit Spielpassung medium fit Übergangspassung negative allowance Übermaß positive allowance Spiel (einer Passung) shaft Welle 09 B1 10 A2–B1 A form tolerance states how far an actual surface is permitted to vary from the desired geometric form. What can you tell me about the form tolerance? 122 Unit 23 Interaction Nur zu Prüfzwecken – Eigentum des Verlags öbv