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VERNIER CALIPERS

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  Parts of a vernier calipers A vernier caliper is a precision measuring instruments. It is used to measure up to an accuracy of 0.02mm.The parts of  a vernier caliper fixed jaws(1 and 2) are parts of the beam scale. One jaw is used for taking external measurements, and the other for internal measurements. Movable jaws(3and4): movable jaws are part of the vernier slide. One jaw is used for external measurements, and the other for internal measurements Vernier slide(5) :A vernier slide moves over the beam and can be set in any position by means of a spring loaded thumb lever beam(6): The vernier slide, and the depth bar attached to it, slide over the beam. The graduation on the beam are called the main scale division. depth bar(7): The depth bar is attached to the vernier slide and is used for depth measurement. Thumb lever(8): The thumb lever is a spring loaded lever which helps to set the vernier slab in any position on the beam scale. vernier scale (9): The vernier scale is ...
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Lathe cutting tools-toola angles and their functions

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  Lathe cutting tools-tool angles and their functions . functions of angles and clearance given on the cutting tools . the angles of a lathe cutting tool . the characteristics of a rake angle . the characteristics of  a clearance angle The tool acts like a wedge during turning. The wedge shaped cutting edge penetrates into the work and removes the metal. This necessitates the grinding of a tool cutting edge to a wedge shape. When we sharpen a pencil with a pen knife by trial and error, we find that the knife must be presented to the wood at a definite angle, if success is to be achieved. If, in the place of a wooden pencil, a piece of soft metal such as brass is cut, it will be found that the cutting edge gets crumbled. For tha blade to cut the brass successfully, the cutting edge must be ground to a less acute angle. Angles ground on a lathe cutting tool All the angles may not be located or found in every tool. As an example a roughing tool is chosen. The angles and clearance...
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Parallel blocks-2types of parallel blocks

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  Parallel blocks .the types of parallels .the constructional features of parallel blockd . uses of parallel blocks The parallel blocks of different types are used for setting workpieces for machining. The commonly used are of two types. Solid parallels Adjustable parallel Solid parallels This is the type of parallel which is very much used in machine shop work. They are made of steel  pieces of rectangular cross secction and are available in different lengths and cross sectional sizes. They are hardened and ground and, sometimes, finished by lapping. Paralles are machined to close limits, and are perfectly flat squre, and parallel throughout the length. These are made in  pairs of indentical diemensions. Grades Parallels are made in two grades-Grade A and Grade B. Grade A is meant for fine toolroom type of work, and Grade B for general machine shop work. Adjustable parallels These consist of two tapered blocks sliding one over the other in a tongue and groove assembly. T...
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