| Go-nogo Gauge |
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Information AboutGo-nogo Gauge |
| CATEGORIES ABOUT GO-NOGO GAUGE | |
| dimensional instruments | |
| metalworking measuring instruments | |
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It is an integral part of the Quality process that is used in the Manufacturing industry to ensure interchangeability of parts between processes, or even between different manufacturers. A Go NoGo gauge is a measuring tool that does not return a ''size'' in the conventional sense, but instead returns a ''state''. The ''state'' is either acceptable (the part is within tolerance and may be used) or it is '''unacceptable''' (and must be rejected). They are well suited for use in the production area of the factory as they require little skill or interpretation to use effectively and have few, if any, moving parts to be damaged in the often hostile production environment. PLUG GAUGE These gauges are referred to as plug gauges; they are used in the manner of a . They are generally assembled from standard parts where the gauge portion is interchangeable with other gauge pieces (obtained from a set of pin type Gauge Blocks ) and a body that uses the Collet principle to hold the gauges firmly. To use this style of gauge, one end is inserted into the part first and depending on the result of that test, the other end is tried. In the right hand image, the top gauge is a thread gauge that is screwed into the part to be tested, the labeled ''GO'' end will enter into the part fully, the ''NOT GO'' end should not. The lower image is a plain plug gauge used to check the size of a hole, the green end is the ''GO'', red is the ''NO GO''. The tolerance of the part this gauge checks is 0.30mm where the lower size of the hole is 12.60mm and the upper size is 12.90mm, every size outside this range is ''out of tolerance''. This may be initially expressed on the parts drawing in a number of styles, three possibilities may be:-
GAP GAUGE These images illustrate an alternative type of gauge. The gap gauge has four ''anvils'' or ''jaws'', the first one or pair (outermost) are set using the upper limit (tolerance) of the part and the inner set adjusted to the lower limit of the part. The usage of this gauge may be more intuitive than the plug type. A correctly machined part will pass the first set of jaws and stop at the second — end of test. In this manner a part may be checked in one action, unlike the plug gauge that needs to be used in the correct sequence and flipped to access the second gauge. The left image is a plain gap gauge used to measure outside distances (diameters), the right hand image shows two views of a thread gap gauge. OTHER STYLES Once the concept is understood, the principle of operation can lead to all manner of designs where internal grooves, keyways, splines etc. may be measured in a simple yet effective manner. These will often be made to order by the Toolmaker s, or a related skilled Tradesman . REFERENCES Limit (GO & NO GO) Gauges |
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