Depth gauge least count

Explanation: A Vernier depth gauge is a precision instrument, used to measure the depth of holes, recesses, slots and steps within the accuracy of 0.02 mm. It consists of the following parts: • Base • Graduating Beam • Clamping Screws • Fine adjustment mechanism • Vernier Scale The beam is graduated with the main scale in mm.

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Table of Contents • • • • • • • • • • • • • • • • • What is Depth Micrometer ? A depth micrometer is a sensitive tool that is used to measure the depth of small holes and bores. Used by engineers and mechanics, this device has a series of unique pieces that help it dial in an exact measurement. Reading depth micrometers is a precise science that must be performed carefully. Depth micrometer is an instrument used for measuring depth of holes to an accuracy of 0.01 mm and 0.001 in. Depth micrometer can only be used in places where there is a satisfactory seating for the instrument head, and the bottom of the hole being measured is parallel with the seating. It (micrometer depth Depth Micrometer Parts It consists of the following parts as shown in the figure. 2. Screwed spindle : This spindle does the actual measuring. 3. Graduated sleeve : This has the datum line and fixed graduations which are numbered 0,9,8,7, etc. reading from left to right. 4. A tubular cover : This is known as the thimble fastened with the spindle at its outer end and moves with the spindle. 5. Ratchet stop : A small extension to the thimble. 6. Locking ring: This is to lock the instrument at any desired setting. In use, the spindle is screwed back to a point where it will clear the bottom of the hole being gauged. The instrument head is then placed across the top of the hole and held there whilst the spindle is screwed down until it just contacts the work. Depth Micrometer Least Count Depth micrometer ...

Measurement System Types and Characteristics Vernier Calipers/Height Gauges (Depth Gauges) Overview Hand calipers are measuring instruments that can measure a variety of items such as length (outer shape), inner diameter, and level differences. Their use is widespread in manufacturing due to their ease of use and their ability to perform measurements with comparatively high accuracy. Recently, digital hand calipers have become increasingly popular. The most commonly used hand calipers are M-type hand calipers and BC-type hand calipers, which are used to measure large objects. View Catalog Construction and Applications • Length (outer shape) measurement: Close the large outer jaws on the measurement target, and then read the values from the main scale and the Vernier scale. • Inner diameter measurement: Insert the small inner jaws inside the measurement target, and widen the jaws until there is no gap between the jaws and the target to perform the measurement. • Level difference measurement: Insert the depth probe or a step into the hole or level difference to perform measurement. How to use Vernier calipers • During measurement, grasp the main scale and move the slider with your thumb to close the large outer jaws around the target. Pushing the slider too forcefully will cause the jaws to be at an angle, which will prevent accurate measurement. Also, when measuring a cylinder, be sure to firmly close the parallel surfaces of the large outer jaws around the target. • Read t...