Application of Slip Gauges for Measuring
Slip gauges, also known as gauge blocks, are precision measuring tools used as reference standards in engineering measurement. They are used to build up exact dimensions by combining several blocks together. Slip gauges are widely used in tool rooms, inspection departments, and calibration laboratories.
Applications of Slip Gauges
- Calibrating precision measuring instruments such as micrometers and vernier calipers.
- Checking accuracy of machine tools.
- Setting precise dimensions in jigs and fixtures.
- Checking limit gauges.
- Measuring small linear dimensions with high accuracy.
- Setting sine bars for angular measurement.
Sine Bar
Principle
The sine bar works on the principle of trigonometry. It is based on the relationship between the sine of an angle and the opposite side of a right-angled triangle.
Formula:
Sin θ = Opposite side / Hypotenuse
In sine bar measurements:
- The hypotenuse is the distance between the centers of the two rollers.
- The opposite side is the height obtained by stacking slip gauges.
Using this principle, precise angles can be measured or set.
Construction
- A hardened steel bar with two precision rollers fixed at the ends.
- The rollers are accurately spaced.
- The top surface of the sine bar is perfectly flat and parallel to the axis of the rollers.
Specifications of Sine Bar
- Distance between roller centers is usually 100 mm, 200 mm, or 300 mm.
- Rollers are made from hardened and ground steel.
- The top surface is accurately ground and parallel.
- Used along with slip gauges and a surface plate.
Applications of Sine Bar
- Measuring angles accurately.
- Setting precise angles in machining operations.
- Checking angular accuracy of machine components.
- Inspecting tapers and angular surfaces.
Procedure to Check Adherence to Specification and Quality Standards
Quality control ensures that manufactured components meet the required specifications and standards. The following procedures are commonly used to verify compliance.
Inspection Process
- Verify the design specifications and engineering drawings.
- Select appropriate measuring instruments.
- Measure the dimensions of the component.
- Compare the measured values with specified tolerances.
- Record inspection results.
Types of Inspection
- Visual Inspection: Checking surface defects and visible errors.
- Dimensional Inspection: Measuring dimensions using gauges and instruments.
- Functional Inspection: Checking the performance of the component.
Quality Standards
Quality standards such as BIS (Bureau of Indian Standards) ensure uniformity, safety, and reliability in engineering products. Compliance with these standards helps maintain product quality and consistency.
Conclusion
Slip gauges and sine bars are important precision measuring tools used in engineering workshops for accurate measurement and angular inspection. Proper inspection procedures and adherence to quality standards ensure that manufactured components meet design specifications and perform reliably.