Tolerancing. Summary
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1 Tolerancing Summary
2 Summary What will we learn We will learn about tolerancing and how important this technique is to mass production. Key points If a feature s size is toleranced, it is allowed to vary within a range of values or limits. Tolerancing enables an engineer to design interchangeable or replacement parts.
3 Tolerancing A.1) Tolerancing for Interchangeability
4 Tolerancing / Interchangeability Tolerancing is dimensioning for interchangeability. What is interchangeability? An interchangeable part is simply a mass produced part (a replacement part).
5 Tolerancing / Interchangeability How is a feature on an interchangeable part dimensioned? The feature is not dimensioned using a single value, but a range of values
6 Tolerancing / Interchangeability A tolerance is the amount of size variation permitted. You can choose a tolerance that specifies a large or small variation Size limits =.994 Tolerance = =.011
7 Tolerancing / Interchangeability Why do we want a part s size to be controlled by two limits? It is necessary because it is impossible to manufacture parts without some variation. The stated limits are a form of quality control.
8 Tolerancing / Interchangeability Choosing a tolerance for your design. Specify a tolerance with whatever degree of accuracy that is required for the design to work properly. Choose a tolerance that is not unnecessarily accurate or excessively inaccurate.
9 Tolerancing / Interchangeability Choosing the correct tolerance for a particular application depends on: the design intent (end use) of the part cost how it is manufactured experience
10 Tolerancing A-2) Tolerance Types
11 Tolerance Types The tolerancing methods presented are: Limit dimensions Plus or minus tolerances Page or block tolerances
12 1. Limit Dimensions Limits are the maximum and minimum size that a part can obtain and still pass inspection. For example, the diameter of a shaft might be specified as follows.
13 1. Limit Dimension Order External dimensions: The larger dimension is first or on top and the smaller dimension is last or on the bottom. Internal dimensions: The smaller dimension is first and the larger dimension is last.
14 1. Limit Dimension Order Why? Does the order matter? This convention is used to avoid machining mistakes. Is the following dimension for a shaft or hole? Shaft
15 2. Plus or Minus Tolerances Plus or minus tolerances give a basic size and the variation that can occur around that basic size.
16 3. Page or Block Tolerances A page tolerance is actually a general note that applies to all dimensions not covered by some other tolerancing type.
17 Tolerancing A-3 General Definitions
18 General Definitions What are the limits, tolerance and allowance for the following shaft/hole system? Are they the same or different?
19 General Definitions Limits: The maximum and minimum diameters. Tolerance: The difference between two limits. Allowance: (Minimum Clearance) The difference between the largest shaft diameter and the smallest hole diameter.
20 Exercise A-3 General definitions
21 Exercise A-3 What are the limits of the shaft and the hole? Shaft: Hole:
22 Exercise A-3 What is the tolerance for the shaft and the hole? Shaft: Hole: D shaft d shaft = D hole d hole =
23 Exercise A-3 What is the minimum clearance (allowance)? d hole D shaft =
24 Exercise A-3 What is the maximum clearance? D hole d shaft =
25 Tolerancing B-1) Tolerancing Standards
26 Tolerancing Standards Standards are needed to; make it possible to manufacture parts at different times and in different places that still assemble properly. establish dimensional limits for parts that are to be interchangeable.
27 Tolerancing Standards The two most common standards agencies are; American National Standards Institute (ANSI) / (ASME) International Standards Organization (ISO).
28 Tolerancing B-2) Inch Tolerances
29 Inch Tolerances Definitions Limits: The limits are the maximum and minimum size that the part is allowed to be. Basic Size: The basic size is the size from which the limits are calculated. It is common for both the hole and the shaft and is usually the closest fraction.
30 Inch Tolerances Definitions Tolerance:The tolerance is the total amount a specific dimension is permitted to vary.
31 Exercise B Inch tolerance definitions
32 Inch Tolerances Definitions Maximum Material Condition (MMC): The MMC is the size of the part when it consists of the most material. Least Material Condition (LMC): The LMC is the size of the part when it consists of the least material.
33 Inch Tolerances Definitions Maximum Clearance: The maximum amount of space that can exist between the hole and the shaft. Max. Clearance = LMC hole LMC shaft
34 Inch Tolerances Definitions Minimum Clearance (Allowance): The minimum amount of space that can exist between the hole and the shaft. Min. Clearance = MMC hole MMC shaft
35 Types of Fits There are four major types of fits. Clearance Fit Interference Fit Transition Fit Line Fit
36 Types of Fits What is a clearance fit? There is always a space. Min. Clearance > 0
37 Types of Fits What is an interference fit? There is never a space. Max. Clearance 0 Sometimes called force fit
38 Types of Fits What is a transition fit? Depending on the sizes of the shaft and hole there could be a space or no space. Max. Clearance > 0 Min. Clearance < 0 Force fit or Clearance is acceptable
39 Types of Fits What is a line fit? There might be a space or a surface contact. Min. Clearance > or = 0
40 Exercise C Types of fits See handout
41 Exercise D Determining fit type See handout
42 ANSI Standard Limits and Fits The following fit types and classes are in accordance with the ANSI B (R1994) standard.
43 ANSI Standard Limits and Fits RC: Running or Sliding Clearance fit. Intended to provide running performance with suitable lubrication. RC9 (loosest) RC1 (tightest)
44 ANSI Standard Limits and Fits Locational fits (LC, LT, LN). Locational fits are intended to determine only the location of the mating parts. LC = Locational clearance fits LT = Locational transition fits LN = Locational interference fits
45 ANSI Standard Limits and Fits FN: Force Fits. Force fits provide a constant bore pressure throughout the range of sizes. FN1 FN5 (tightest)
46
47 Exercise E-1 Limits and fits
48 ANSIB
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