View
2
Download
0
Category
Preview:
Citation preview
1
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
MEE2006: Introduction to Mechanical Design
Instructor: Prof. Keun Ryu (kryu@hanyang.ac.kr; http://turbolab.hanyang.ac.kr)
Note 6: Understanding drawings: Basics
Information in engineering drawing: Example
2
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
It is important to note that each standard (ASME-American Society of Mechanical Engineers-, ISO-International
Organization for Standardization-, ANSI- American National Standards Institute-, etc) change symbols periodically.
You must be familiar with both old and new (updated) symbols because either may be used on the drawings. The
below is one of examples.
3
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
4
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
Datum identification symbol
Feature control frame
5
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
MMC & LMC Maximum material condition (MMC) refers to a feature-of-size that contains the greatest amount of material, yet
remains within its tolerance zone. Some examples of MMC include: Largest pin diameter & Smallest hole size.
In contrast, least material condition (LMC) refers to a feature of size containing the least amount of material, yet
remains within its tolerance zone: Smallest pin diameter & Largest hole size.
6
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
A feature control frame is employed when a location or form tolerance is related to a datum.
7
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
Form geometric tolerances
8
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
9
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
Orientation geometric tolerances
10
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
11
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
12
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
Location of geometric tolerances
13
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
14
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
Runout geometric tolerances Total runout controls circularity, straightness, angularity, and cylindricity of a part when applied to surfaces
rotated around a datum axis.
Circular runout is applied to features independently and controls circularity of a single circular cross section.
15
© Prof. Keun Ryu @ Hanyang University, Korea kryu@hanyang.ac.kr
Recommended