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Types of mechanical tools and their ueses. And different types of tools

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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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LATHE-Head stock and Lathe Bed

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Head stock and lathe bed . function of the headstock . differentiate between cone pully headstock and all geared headstock Function Provide a means to assemble the work holding devices. Transmit the drive from the main motor to the work. Accommodate shafts, gears and levers for a wide range of varyingwork speeds. Ensure arrangement for lubricating the gears, shafts and bearings. Types of headstocks All geared headstock Cone pulley drive headstock All geared headstock It is box section casting having a removable top cover. It has internal webs for stiffening, and to take shaft bearing. It has an input shaft which is connected by means of V belts to the main moto, and it runs at a constant speed. It is equipped with clutches and a brake. There may be two or more intermediate shafts on which sliding gears are mounted. The main spindle is the last driven shaft in the headstock assembly. The nose of the spindle is outside the headstock casting, and is designed to accommodate the work holdin...
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