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Answer :
The difference between the surfaces of two things, along a circle, or between two or more separate objects.
What is a dial test Indicator?
In mechanical and industrial applications, dial indicators are measuring devices. They are designed to measure in either vertical or horizontal positions and are commonly used to assure the correctness of machined parts by measuring clearances, tolerance, and variation in tolerance.
A dial test indictor is made up of the following components: a circular body, an indicating hand, a revolution counter, a graduated scale, and a spindle with a contact point.
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To adjust a Dial Test Indicator reading, multiply the actual reading by the cosine of the angle between the DTI probe and the perpendicular to the contact surface. This corrects the reading to account for the increased path length when the DTI is not at a right angle to the surface. For precise measurements, techniques like differential leveling can also be used.
When using a dial test indicator (DTI), accurate measurements depend on the angle at which the gauge's probe contacts the surface. Ideally, the probe should be perpendicular to the contact surface. However, if the DTI is not positioned at a right angle to the contact surface, the reading must be adjusted to account for this angular discrepancy. This adjustment is necessary because the path of the probe's movement is longer when at an angle, potentially leading to an incorrect reading. By understanding the geometry involved and using trigonometry, corrections can be made to ensure the DTI provides a precise indication of the surface's variations.
To adjust the reading, one must consider the cosine of the angle between the DTI's probe and the normal to the contact surface. Multiply the actual DTI reading by the cosine of the angle to obtain the corrected measurement. This compensates for the increased travel distance due to the angle and provides a true representation of the surface variation in relation to the DTI's vertical axis.
Using Differential Leveling for Precise Measurements
To further ensure accuracy in leveling and measuring distance, techniques such as differential leveling can be employed. This surveying method involves a leveling instrument placed precisely at a midpoint between two points. The method helps to mitigate potential errors in the line of sight by maintaining symmetry in the measurement process.
