Limits, Fits and Gauges – Tolerances
Posted by mechlook info on February 5th, 2012 12:45 PM | No Comment
Tolerances
As already indicated, tolerance can be defined as the magnitude of permissible variation of a dimension or other measured or control criterion from the specified value. Tolerances have to be allowed because of the inevitable human failings and machine limitations ...
Limits, Fits and Gauges – Interchangeability
Posted by mechlook info on February 5th, 2012 09:55 AM | No Comment
Interchangeability
An interchangeable part is one which can be substituted for similar part manufactured to the same drawing..
In earlier times production used to be confined to small number of units and the same operator could adjust the mating components to obtain ...
Limits, Fits and Gauges – Introduction
Posted by mechlook info on January 5th, 2012 01:04 AM | No Comment
Introduction
It is well known fact that no two things in the nature can be identical, they may be found to be closely similar. This is true of production of component parts in engineering also. We know that every process is ...
Limits, fits and guages-Tolerances and Geometry (Shape)
Posted by mechlook info on December 2nd, 2011 11:07 PM | No Comment
Theoretically speaking, tolerances on dimensions are meant to specify the extent of permissible variation of size and not the geometry or shape of the component. However, in actual practice, a given dimension usually refers to geometry or shape also. For ...
Limits, Fits and Guages-Paper Layout Guaging
Posted by mechlook info on December 2nd, 2011 11:05 PM | No Comment
Paper layout gauging is being commonly used since it is direct and unexpensive technique and paper gauges can be easily and quickly produced. It makes an immediate functional check of inspection results, permitting the adjustments possible with functional three-dimensional receiver ...
Limits, fits and guages-Positional Tolerances
Posted by mechlook info on December 2nd, 2011 11:05 PM | No Comment
If attempts are made to specify positional tolerances in conventional way, then to specify a particular positional feature, one occassionaly ends up with several tolerances. All this results in
accumulation of tolerances and thus the desired positional tolerance would be too ...
Limits, fits and guages-Geometric Dimensioning and Tolerancing
Posted by mechlook info on December 2nd, 2011 11:05 PM | No Comment
Tolerances on linear dimensions have been discussed and we will now concentrate on tolerances with respect to actual function and relationship among various components. Geometric dimensioning and tolerancing are means of specifying engineering design and drawing requirements with respect to ...