Mechanical Engineering

Flatness: A surface is said to be flat within a given range of measurement. Flatness testing: r anauto If the test  surface  is  large,  then  it  is tested  for  flatness using  a sprit  level o collimator. Procedure to determine flatness: A surface can be considered to be a collection of a large number of lines. Flatness testing by…

Straightness: Is a geometrical shape. Straightness measuring instrument:   Straight edge   Sprit level   Auto – Collimator

Introduction: Contain degree of surface finish is required for the proper functioning of the working surface. Types of surface finish:   Nominal surface   Rough surface   Wavy surface Elements of surface texture:   Surface roughness   Profile…

Radius measurement methods:   Radius measurement using surface plate and rollers. (external radius)   Radius measurement of concave surface (internal radius) Radius measurement using surface plate and rollers (external radius): 1.…

Introduction:   Gears are mechanical drives.   Gears are used to transmit power. Gear in the form of a toothed wheel. Types of gears:   Spur gear   Helical gear   Spiral gear   Bevel gear   Worm and Worm wheel   Rack and pinion Gear terminology:…

Introduction: Thread geometry procedure cannot be used in normal production work Hence gauges are used where the basis is mating o surfaces. Thread gauge classification:   First group   Second group Form of thread gauges:   Plug ring gauges   Ring screw gauges   Caliper screw gauges…

Measurement of major diameter:   Micrometer   Bench micrometer Measurement of minor diameter:   Using taper paralles   Using rollers Measurement of effective…

Major diameter error   Minor diameter error   Effective diameter error   Flank angle error…

Screw thread   Crest   Root   Flank   Depth of thread   Lead  …

 Screw threads have to perform two functions namely  - Transmission of power and motion  - Acts as…