Machine Drawing

198 Machine Drawing dharm d:\N-Design\Des13-1.pm5 Shaftdia. L f D a D D d Shaft dia B Tw Tr L D+2a DdDDa Hubdia Fig.13.14 Worm a ...

Chains and Gears 199 dharm d:\N-Design\Des13-1.pm5 THEORY QUESTIONS 13.1 What is a gear and what is its function? 13.2 How are g ...

200 JIGS AND FIXTURES 14 14.1 Introduction The requirements of mass production and interchangeable assembly in industry, demand ...

Jigs and Fixtures 201 dharm d:\N-Design\Des14-1.pm5 D A B C A – Workpiece drawn in chain dotted lines and considered transparent ...

202 Machine Drawing dharm d:\N-Design\Des14-1.pm5 replacement. The replacement is simplified by making the outside diameter of t ...

Jigs and Fixtures 203 dharm d:\N-Design\Des14-1.pm5 14.3.4.5 Bush Clearance After fitting the bush in the jig body, there should ...

204 Machine Drawing dharm d:\N-Design\Des14-1.pm5 14.4.2 Box Jig Figure 14.6 shows the half sectional view from the front and th ...

Jigs and Fixtures 205 dharm d:\N-Design\Des14-1.pm5 14.5.3 Set Blocks Cutter set blocks are fastened to the fixture body for pro ...

206 Machine Drawing dharm d:\N-Design\Des14-1.pm5 Work piece Balance weights Pilot bush Tool setting piece Work piece Back plate ...

Jigs and Fixtures 207 dharm d:\N-Design\Des14-1.pm5 Pipe fabrication Locator for channel Removable location pins Locator for gus ...

15 Limits, Tolerances, and Fits 15.1 Introduction The manufacture of interchangeable parts require precision. Precision is the d ...

Limits, Tolerances, and Fits 209 dharm d:\N-Design\Des15-1.pm5 15.2.6 Lower Deviation It is the algebraic difference between the ...

210 Machine Drawing dharm d:\N-Design\Des15-1.pm5 Fig. 15.2 Degree of accuracy expected of manufacturing process 16 15 14 13 12 ...

Limits, Tolerances, and Fits 211 dharm d:\N-Design\Des15-1.pm5 Fig. 15.3 Graphical illustration of tolerance zones Fundamental d ...

212 Machine Drawing dharm d:\N-Design\Des15-1.pm5 Figure 15.2 shows the tolerances (in microns or in micrometres) that may be ob ...

Limits, Tolerances, and Fits 213 dharm d:\N-Design\Des15-1.pm5 Diameter Tolerance Grades steps in mm 01 0 1 2 3 4 5 6 7 8 9 10 1 ...

214 Machine Drawing dharm d:\N-Design\Des15-1.pm5 Fundamental deviation in microns (1 micron = 0.001 mm) Diameter Upper deviatio ...

Limits, Tolerances, and Fits 215 dharm d:\N-Design\Des15-1.pm5 Fundamental deviation in microns (1 micron = 0.001 mm) Diameter U ...

216 Machine Drawing dharm d:\N-Design\Des15-1.pm5 Fundamental deviation in microns (1 micron = 0.001 mm) Diameter Lower deviatio ...

Limits, Tolerances, and Fits 217 dharm d:\N-Design\Des15-1.pm5 Fundamental deviation in microns (1 micron = 0.001 mm) Diameter L ...