3 plug gauge a gauge outside measuring surfaces of

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3. Plug gauge: A gauge outside measuring surfaces of which are designed to verify the specified uniformity of holes. 4. Ring gauge: A gauge the inside measuring surfaces of which are circular in form. 5. Progressive cylindrical plug gauge: A complete internal gauge consisting of handle and gauging member in which the GO and NO GO gauging sections are combined in a single unit secured to one end of the handle. 6. Snap gauge : A fixed gauge arranged with inside measuring surfaces for callipering diameters, lengths, thickness or width. 7. Plain cylindrical plug gauge: A complete internal gauge of single or double ended type. It consists of a handle and gauging member with suitable locking means. 8. Taper ring gauge : An external gauge the internal contour of which conforms to the frustum of a cone having diameter, taper and length suitable for the gauging of external taper dimensions. 9. Thread snap gauges: These consist of conical points or serrated or threaded blades, plates, or cylinders which are adjustably mounted in a snap-gauge frame. 10. Spline plug gauge: A plug gauge having a series of projecting keys equally spaced about the periphery, when fit into the spline ways to be gauged. RAGHU INSTITUTE OF TECHNOLOGY Dept. of MECH Metrology Unit - 2
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75 11. Wire type plug gauge: A plug gauge comprising a gauging member of straight cylindrical section throughout its length and which is held in a collet- type handle. 12. Flat plug gauge: A plug gauge made in the form of a central gauge axial segment of a plain cylindrical plug gauge. Q 23. (a) Why plug gauges are generally renewable? (b) Will a plug gauge indicate any ovality in a circular hole? (c) What is a telescopic gauge? Do we set any limits on this gauge? How does this gauge work? (d) Make a sketch of a plug depth gauge. Ans. (a) Plug gauges are usually subjected to too much wear and the plugs need to be discarded quite often. Therefore, it is often cheaper to use renewable end plug gauges. (b) Plug gauge will not indicate any ovality in the hole. (c) Telescopic gauge has a pair of spherical contacts (Fig. below), which are forced apart by a spring. the gauge is forced into the hole to be checked. It is then locked in that position by means of a locking screw. The overall dimension over the contacts is then measurement by using a micrometer. (d) Figure below shows a plug depth gauge commonly used in workshops. RAGHU INSTITUTE OF TECHNOLOGY Dept. of MECH Metrology Unit - 2
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76 IMPORTANT DEFINITIONS Calibration : The process of inspecting and then adjusting a gauge or other measurement tool to meet a specific parameter. Limit gauge: A device of defined geometric form and size used to assess the compliance of a feature or pattern of features of a work piece with a dimensional specification and its accompanying tolerance. Functional gauge: A fixed-limit gauge used to verify of feature or a pattern of feature's compliance with virtual condition boundaries that are generated by the collective effect of the feature's maximum material condition and the applicable geometric tolerance at that size.
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