Category: Quality Control and Inspection

Construction and How to Use It What is a Sine Bar? A sine bar is a precision tool used in metrology for measuring angles with high accuracy. It consists of a hardened, precision ground body with two identical cylinders fixed at the ends. The distance between the centers of the cylinders is precisely controlled. Construction of a Sine Bar The construction of a sine bar involves the following components: Body: A flat, rectangular block made of high-quality steel or cast iron. Cylinders: Two precision-ground cylinders mounted on the body at a fixed distance apart. Surface Plates: Used as a reference plane when using the sine bar. How to Use a Sine Bar To use a sine bar for measuring or setting an angle, follow these steps: Place the Sine Bar on a Surface Plate: Ensure the surface plate is clean and free of debris. Set the Desired Angle: Calculate the height of the gauge blocks needed based on the sine of the desired angle. The formula is: Height = Distance Between Cylinders × sin(Desired Angle) Position Gauge Blocks: Place the calculated height of gauge blocks under one cylinder of the sine bar. Verify the Setup: Use a dial indicator or spirit level to ensure the top surface of the sine bar is parallel to the desired angle. Applications of a Sine Bar Sine bars are widely used in industries for various applications, including: Setting up workpieces at precise angles during machining. Inspecting machined parts for angular accuracy. Calibrating other measuring instruments. Conclusion The sine bar is an essential tool for achieving accurate angular measurements in manufacturing and quality control processes. Its simplicity and reliability make it indispensable in many industrial settings.

Category: Quality Control and Inspection

Sine bar

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