parts of a dial caliper

Guri Bee

3 min read

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21-10-2024

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Demystifying the Dial Caliper: A Comprehensive Guide to Its Parts and Functions

The dial caliper is a precision measuring tool ubiquitous in workshops, labs, and manufacturing facilities. Its accuracy and versatility make it indispensable for a wide range of tasks, from measuring the diameter of a bolt to gauging the thickness of a sheet metal. But understanding the various parts and their functions is crucial to using this instrument effectively.

Let's break down the anatomy of a dial caliper:

1. Jaws: The Measuring Powerhouse

The jaws are the primary contact points with the object being measured. They come in two types:

• Outside Jaws: Used to measure the outer dimensions of an object.
• Inside Jaws: Used to measure the inner dimensions of an object, like the diameter of a hole.

Important Note: The jaws are often made of hardened steel to ensure accuracy and durability.

Example: If you're measuring the width of a metal bar, you'd use the outside jaws. If you're measuring the diameter of a pipe, you'd use the inside jaws.

Source: https://github.com/jwilber/mechanical-design-basics/blob/master/docs/measuring-tools/dial-calipers.md

2. Depth Gauge: Reaching the Unreachable

The depth gauge is a small, movable arm extending from the main body of the caliper. It's used to measure the depth of a hole, groove, or other recessed feature.

Example: Imagine you need to measure the depth of a threaded hole. You'd use the depth gauge to extend it into the hole and measure the distance from the surface to the bottom of the hole.

Source: https://github.com/jwilber/mechanical-design-basics/blob/master/docs/measuring-tools/dial-calipers.md

3. Dial: The Reading Center

The dial is the heart of the caliper, displaying the measurement. It features a graduated scale, typically in millimeters or inches, with a rotating pointer indicating the measurement.

Key Points:

• Resolution: The smallest increment on the scale determines the resolution of the caliper. A higher resolution means more precise measurements.
• Vernier Scale: Some dial calipers include a vernier scale that allows for even greater accuracy. This secondary scale allows for measurements between the primary scale markings.

Source: https://github.com/jwilber/mechanical-design-basics/blob/master/docs/measuring-tools/dial-calipers.md

4. Thumb Wheel: Precise Adjustment

The thumb wheel is a small, knurled wheel located on the body of the caliper. It's used for fine adjustments to the measurement, ensuring precise positioning of the jaws.

Example: If you're trying to get a very specific measurement, you can use the thumb wheel to make small, gradual adjustments to the jaw position until you achieve the desired reading.

Source: https://github.com/jwilber/mechanical-design-basics/blob/master/docs/measuring-tools/dial-calipers.md

5. Lock Lever: Securing the Measurement

The lock lever is a small lever that clamps the jaws in place, holding the measurement. This prevents the jaws from moving accidentally and ensures accurate readings.

Source: https://github.com/jwilber/mechanical-design-basics/blob/master/docs/measuring-tools/dial-calipers.md

6. Zero Setting Knob: Calibration for Precision

The zero setting knob allows you to calibrate the caliper, ensuring it starts at zero when the jaws are closed. This is crucial for accurate measurements.

Example: Imagine you're measuring the thickness of a piece of paper. Before taking the measurement, you would close the jaws and use the zero setting knob to ensure the pointer on the dial aligns with the zero mark.

Source: https://github.com/jwilber/mechanical-design-basics/blob/master/docs/measuring-tools/dial-calipers.md

Understanding the Dial Caliper: A Powerful Tool

By understanding the different parts and their functions, you can wield the dial caliper with confidence. It's a remarkably versatile tool for taking precise measurements across a variety of applications. From simple DIY projects to complex manufacturing processes, the dial caliper remains an essential tool for achieving accurate results.