Tests for Checking Rotation
Posted by mechlook info on December 13th, 2011 08:24 PM | No Comment
Tests for checking the rotation of a body are made for three conditions :
(a) Run-out.
(b) Periodical axial slip.
( c) Camming.
We shall now study the definition and meaning of these three conditions and then the ways to measure these.
1. Run-out. A ...
Flatness Testing
Posted by mechlook info on December 12th, 2011 10:24 PM | No Comment
Like straightness testing, the simplest form of flatness testing is possible by comparing the surface with an accurate surface. One of the surfaces is marked with Prussian Blue and the other surface rubbed over it. The distribution of colour over ...
Mathematical Treatment of Determination of Straightness and Flatness of Surfaces
Posted by mechlook info on December 12th, 2011 10:23 PM | No Comment
For determining straightness, autocollimator is placed on a reference surface and a block containing reflector is traversed along a line on the surface whose straightness is to be determined and readings noted at regular intervals. Such observations can also be ...
Measurement of Circularity-Straightness, Flatness, Squareness, Parallelism, Circularity and Rotation
Posted by mechlook info on November 6th, 2011 02:55 AM | No Comment
1. Introduction. In the assembly of circular parts, only the dimensional tolerances on diameter will not suffice the requirements, but it is the geometrical accuracy (accuracy of form) that needs closer attention. If cylindrical parts are measured from devices, having ...