TAILIEUCHUNG - Lecture Engineering drawing and design - Lecture 16: Mechanical elements screws, fasteners, non-permanent joints

Lecture 16 - Mechanical elements screws, fasteners, non-permanent joints. The following will be discussed in this chapter: Introduction, definitions and standards, threaded fasteners, properties of a threaded fastener, load that a bolt can sustain,. | Design web Design web Introduction ME 1110 – Engineering Practice 1 Engineering Drawing and Design - Lecture 16 The helical-thread screw was very important invention for application in: • power transmission, • angular to linear motion change, • generation of large forces, • non-permanent joints. Mechanical Elements Screws, Fasteners, non-permanent Joints Fastening: the major target is to reduce number of joins. One of the most interesting subjects in engineering: Prof Ahmed Kovacevic Example: - Boeing 747 requires as many as million fasteners. Some are very expensive. School of Engineering and Mathematical Sciences Room CG25, Phone: 8780, E-Mail: 1 Ahmed Kovacevic, City University London Definitions and standards Designer’s aim is to select an adequate fastener (bolt, nut, cap, screw ) for an application in question: - the shape and the arrangement - the size and other functional parameters - to check if selected fastener can sustain required load 2 Ahmed Kovacevic, City University London Design web Design web Screw Threads Metric Threads: Pitch distance between adjacent thread forms measured parallel to the thread axis. • Thread angle = 60o • Symmetric profiles • Identified as M and MJ • Coarse and fine pitch • Specification of the thread: Orientation Threads are usually right-handed (RH) unless otherwise required Thread height (H) Thread angle For M and UN threads H= 3 p 2 M12 x 60o for M and UN threads Crest of the thread Pitch: coarse or fine May be flat or round Major diameter (d, dc) Nominal major diameter Largest diameter of a screw thread Mean–Pitch diameter (d2, dp) The metric thread designation Mean diameter; teeth section is p/2 long Minor diameter (d1, dr) Smalest diameter of the thread 3 Ahmed Kovacevic, City University London 4 Ahmed Kovacevic, City University London Design web Design web Screw Threads Metric threads (all dimensions in .

• Cơ khí - Chế tạo máy
• Engineering drawing
• Engineering design
• Lecture Engineering drawing and design
• Mechanical elements screws
• Non permanent joints
• Screw threads
• Communication modes
• Technical drawing standards
• Drawing procedure
• Assembly drawing
• Engineering design process
• Mechanical design process
• Problem definition
• Alternative solutions
• Satellite hinge
• Failure mode
• Example shaft
• Textbook of engineering drawing
• Drawing instruments
• Dimensioning practices
• Geometrical constructions
• Orthographic projections
• The nature of design
• Communication of design
• Philosophy of designing
• Recognize types of pictorials
• Parallel projection
• Perspective projections
• Orthographic views
• Multiview drawings
• Section views
• Features geometric tolerances
• Geometric tolerances
• Surface finish
• Tolerance declaration
• Direct tolerancing method
• Tolerance terminology
• Editing commands
• Textual window
• Layer technique
• Multiline text
• Selecting objects
• Creating drawings
• Design communication
• Technical writing
• Graphical communication
• Mechanical design
• Preliminary design
• Mechanical systems
• Mechanical elements
• Rolling element bearings
• Bearing assembly
• Shaft design characteristics
• Shaft design
• Space frames
• Space truss
• Gear types
• Gear parameters
• Effects analysis
• Oral presentation
• Isometric projection
• Freehand sketching
• Isometric views
• Engineering Drawing & CAD Standards
• Drawing Conventions
• Thread And Fastener Representation
• Line Conventions
• Drawing Media