states that the “GO” gauge should always be designed so that it will cover the maximum metal condition (MMC) of as many dimensions as possible in the same , whereas a “NOT GO” gauge should cover the maximum metal condition of one dimension only.
According to the rule, a GO gauge should have a full circular section and be of a full length of the hole, it has to control the diameter at any one point. This ensures that any lack of straightness or parallelism of the hole will prevent the entry of full length GO gauge.
For example, let us assume that a bushing is to be inspected. The bush to mate a shaft. The shaft, therefore, opposed the part in relation to the bushing. Therefore the form of “GO” gauge should exactly coincide with the form of the shaft. For this purpose, the “GO” gauge must be of adequate length not less than the length of the future association of bushing and shaft. If this condition is not satisfied, part inspection with the gauge may prove to be defective or even entirely that the bush being inspected has a curved axis and a short “GO” gauge is employed.
CHECKING A BUSH WITH A CURVED AXIS
The show gauge will through all the curves of the bent bushing. This will lead to the erroneous inclusion that the workplace is within the prescribed limits. Actually, the problem such as bent bushing cannot match properly with the opposed part. A “GO” gauge of appropriate length will not through a part, curved bushing and the error will be revealed. A long “GO” gauge will cylindrical surface not in one direction but in a number of sections simultaneously.
Generally, the length of “GO” gauge will the cylindrical surface, not in one direction, but in a number of sections simultaneously. The length of “GO” gauge should not be less than 1.5 times the diameter of the hole. The length of “NOT GO” gauge is kept smaller than the “GO” gauge.
Originally posted 2018-12-06 09:52:20.
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