Общий каталог FANAR 2021 - страница 308

Technical information i 7.3. Validation of Holes For checking of the through holes and blind holes, there are used go/no go plug gauges. The go gauge should be inserted into a hole with its own weight or with just a little push. The gauge must not be pushed with excessive force, as it could be jammed. The no go gauge should not let itself to be inserted into a hole. Checking Internal Cylindrical Threads For checking of the internal threads, there are used go and no go thread gauges. With the go thread gauge you check the virtual internal thread dimension by checking the bottom dimension of pitch diameter. The go gauge, when manually screwed in, should with no special effort let itself to be screwed in for the whole length of the thread. The thread does not meet requirements, when it proves impossible to screw the gauge in. With the no go thread gauge you check whether the pitch diameter exceeds the upper limit dimension. The no go gauge, when manually screwed in, should with no special effort go in no further than two thread pitches. If the gauge can be screwed in further than the two pitches, it means the thread does not meet requirements. 12 305