Page 113 - CITS - Fitter - Trade Theory

FITTER - CITS

• Checking Runout: They are utilized to detect runout or eccentricity in rotating components. When rolled along
the surface of a rotating component, roller gauges can identify deviations from concentricity.
Common Applications for Both:
• Manufacturing Quality Control: Ball and roller gauges play a crucial role in manufacturing processes to
ensure that machined components meet precise dimensional requirements.
• Aerospace and Automotive Industries: These industries rely heavily on accurately machined cylindrical and
spherical components for critical applications. Ball and roller gauges are extensively used in quality control
procedures to adhere to strict standards.
• Maintenance and Repair: They are valuable tools in maintenance and repair operations for assessing the
condition of worn or damaged cylindrical components and ensuring proper fit and alignment during reassembly.
Formula for measuring the angle of the taper

For Computing the taper angle the following trigonometrical ratio is applied.
From the two measurements taken and the height of the slip packs the ratio is established by subtracting the
measurement ‘Y’ from ‘X’ and dividing it by two. This corresponds to the distance AB.
The length AC corresponds to the size of the slip pack used on one side.

Then the tangent of the taper angle is

Where X is the measurement

over the rollers placed on the slip gauge height, Y is the measurement over the rollers at the smaller end and H
is the slip gauge height. The included angle of the taper will be double the above angle.
Calculate the included angle of the tapered component shown in Fig 1

X=69.3mm
Y = 61.5mm

Height = 70mm
Tan q = (69.3) - (61.5) /2x70
= 7.8/2x70)

98

CITS : CG & M - Fitter - Lesson 15