Representation of features Geometric tolerances. Prof Ahmed Kovacevic
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1 ME 1110 Engineering Practice 1 Engineering Drawing and Design - Lecture 6 Representation of features Geometric tolerances Prof Ahmed Kovacevic School of Engineering and Mathematical Sciences Room C130, Phone: 8780, a.kovacevic@city.ac.uk 1
2 Objectives for today How to represent standard engineering features Gears; Bearings; Seals; Springs Shafts, tubes; Fasteners What are tolerances and how are they specified Geometric tolerances Surface finish & machining 2
3 Exercise DrE-5 - Week 7 Parts to be measured and drawn 3
4 Representing standard features 4
5 Gears 5
6 Terminology and representation of standard components 6
7 Terminology and representation of standard components 7
8 Terminology and representation of standard components 8
9 Terminology and representation of standard components 9
10 Terminology and representation of standard components 10
11 Terminology and representation of standard components 11
12 Terminology and representation of standard components 12
13 Terminology and representation of standard components 13
14 Terminology and representation of standard components 14
15 Terminology and representation of standard components 15
16 Terminology and representation of standard components 16
17 Terminology and representation of standard components 17
18 Terminology and representation of standard components 18
19 BS 8888 for features and components Design web Representation of features BS EN ISO 6411 Technical drawings Simplified representation of centre holes BS EN ISO 6413 Technical drawings Representation of splines and serrations BS EN ISO Technical drawings Symbolic presentation and indication of adhesive, fold and pressed joints BS EN Welded, brazed and soldered joints Symbolic representation on drawings NOTE The BS ISO 128 series of standards covers the general subject of feature representation. Representation of components BS EN ISO Technical product documentation Springs Part 1: Simplified representation BS EN ISO Technical product documentation Springs Part 2: Data for cylindrical helical compression springs BS EN ISO Technical product documentation Springs BS EN ISO 2203 Technical drawings Conventional representation of gears BS EN ISO Technical drawings Simplified representation of the assembly of parts with fasteners Part 1: General principles BS EN ISO Technical drawings Screw threads and threaded parts Part 1: General conventions BS EN ISO Technical drawings Screw threads and threaded parts Part 2: Screw thread inserts BS EN ISO Technical drawings Screw threads and threaded parts Part 3: Simplified representation BS EN ISO Technical drawings Roller bearings Part 1: General simplified representation BS EN ISO Technical drawings Roller bearings Part 2: Detailed simplified representation BS EN ISO Technical drawings Seals for dynamic application Part 1: General simplified representation BS EN ISO Technical drawings Seals for dynamic application Part 2: Detailed simplified representation 19
20 Tolerances Definition:» A tolerance is the total permissible variation of a size, or the difference between the maximum and minimum limits of size. Why is tolerancing necessary?» It is impossible to manufacture a part to an exact size or geometry» Since variation from the drawing is inevitable the acceptable degree of variation must be specified» Large variation may affect the functionality of the part» Small variation will effect the cost of the part requires precise manufacturing requires inspection and the rejection of parts 20
21 Example detailed drawing 21
22 Tolerance Declaration Tolerance can be expressed in different ways: 1. Direct tolerancing method (size)» Limits specifying the allowed variation in each dimension (length, width, height, diameter, etc.) are given on the drawing 2. General tolerance note» Notes like ALL DIMENSIONS HELD TO ± Geometrical tolerancing» Allows for specification of tolerance for the geometry of a part separate from its size» GDT (Geometric Dimensioning and Tolerancing) uses special symbols to control different geometric features of a part 22
23 Datums Plane surface or axis Designated in order that some other feature(s) may relate to it Datums are drawn as shown in the picture 23
24 Geometrical Tolerances Design web Geometric tolerance of a feature (point, line, axis, surface) specifies the tolerance zone in which the feature is required to contain. 24
25 Notation Design web Supplementary symbols Tolerance frame variations 25
26 Tolerance examples Straightness Flatness 26
27 Tolerance examples Form Roundness 27
28 Tolerance examples Symmetry Angularity 28
29 Tolerance examples Squareness 29 Parallelism
30 Tolerance examples Design web Position 30
31 Tolerance examples Position 31
32 Tolerance examples Concentricity 32
33 Cilindricity Design web Tolerance examples Maximum material condition Profile tolerance 33
34 Surface Roughness +Y Average deviation about the mean line measured a O A 1 A 3 A n Mean Line -Y A 2 L Surface Roughness Measured by value R a n A o L 34
35 Surface texture quality Design web (mm) (minch) N-Grade N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12 Finish Ground Finishes Smooth Turned Medium Turned Rough Machined 35
36 Manufacture methods and roughness values 36
37 Conclusions Today we reviewed: Representation of features and parts Importance of tolerance Geometric tolerances Surface finish and machining To be continued (next week) 37
Fits and Tolerances. Prof Ahmed Kovacevic
ME 1110 Engineering Practice 1 Engineering Drawing and Design - Lecture 7 Fits and Tolerances Prof Ahmed Kovacevic School of Engineering and Mathematical Sciences Room C130, Phone: 8780, E-Mail: a.kovacevic@city.ac.uk
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