Measurement of Surface Finish-Introduction
Posted by mechlook info on January 16th, 2012 08:45 PM | No Comment
A great advancement in the present machine age has been possible due to the increased knowledge and constant improvement of the surface textures. The need of producing smoother and harder surfaces was realised as greater strength and bearing loads were ...
Surface Roughness
Posted by mechlook info on January 16th, 2012 08:45 PM | No Comment
On any finished surface, imperfections are bound to be there and these take the form of a succession of hills and valleys which vary both in height and in spacing and result in a kind of texture which in appearance ...
Meaning of Surface Texture and some definitions
Posted by mechlook info on January 16th, 2012 08:44 PM | No Comment
Usually the concept of surface roughness is sensory and it is capable of being understood in an intuitive way. Generally the surface roughness has been experienced and understood by the sense of light and touch etc.
Therefore, to define surface ...
Working mechanism of Dial Indicators
Posted by mechlook info on January 15th, 2012 10:15 PM | No Comment
The necessary high magnification ratio in this instrument is achieved by the use of gears and pinions arrangement in a small area, by arranging the gear train in a manner similar to a clock movement. Method of magnification used is ...
Methods of Measuring Surface Finish
Posted by mechlook info on January 12th, 2012 06:24 PM | No Comment
There are two methods used for measuring the finish of machined part :
(i) Surface Inspection by Comparison Methods.
(ii) Direct Instrument Measurements.
In comparative methods, the surface texture is assessed by observation of the surface. But these methods are not reliable as ...
Surface finish-Replica Method
Posted by mechlook info on January 12th, 2012 06:24 PM | No Comment
When the surface is not readily accessibly to the probe, then a replica of surface is made by dampening a piece of cellulose acetate film in acetone to dampen it and pressing it against the surface till it hardens. By ...
Surface finish-The Sample Length or Cut-off Length
Posted by mechlook info on December 12th, 2011 01:40 AM | No Comment
Difficulties are generally experienced, when measuring the surface roughness of irregular surfaces, in choosing the sample length. The nature of the surface many a times is such that the good indication of the surface can't be obtained when the selected ...