Straightness
Posted by mechlook info on December 18th, 2011 08:47 PM | No Comment
At many places it is required that the surfaces must be perfectly straight, e.g., in a lathe it is desired that tool must move in a straight path to generate perfect cylinder and it is possible only when the controlling ...
Straight Edge
Posted by mechlook info on December 18th, 2011 08:46 PM | No Comment
A straight edge is a measuring tool which consists of a length of a steel of narrow and deep section in order to provide considerable resistance to bending in the plane of measurement without excessive weight. Precision straight edges are ...
Test for Straightness by using Spirit Level and Auto-collimator
Posted by mechlook info on December 18th, 2011 08:45 PM | No Comment
Tests for straightness can be carried out by using spirit level or auto-collimator. The straightness of any surface could be determined by either of these instruments by measuring the relative angular positions of number of adjacent sections of the surface ...
Straightness, Flatness-Laser Equipment for Alignment Testing
Posted by mechlook info on December 14th, 2011 07:48 PM | No Comment
The use of laser permits alignment test to be carried over long distances compared to other conventional equipment like alignment telescope. The advantage of laser equipment is that it produces i real straight line that can be seen in space ...
Parallelism, Equidistance and Coincidence
Posted by mechlook info on December 14th, 2011 07:47 PM | No Comment
1. Parallelism. First we shall be dealing with the parallelism of lines and planes, and then the parallel motion. Let us first understand what we mean by 'line' or 'axis' in metrology. An axis is represented by cylindrical surface of ...
Squareness
Posted by mechlook info on December 14th, 2011 07:45 PM | No Comment
First we shall be dealing with the squareness of straight lines and planes and then the perpendicularity of motion.
Two planes, two straight lines or a straight line and a plane are said to be perpendicular when the error of parallelism ...
Profile Measurements
Posted by mechlook info on December 14th, 2011 07:45 PM | No Comment
Profile is that part of the contour of a component, which is; observed as its boundary line in a functionally significant cross- sectional plane. The inspection and measurement of the profile can be accomplished in many different manners, depending on ...