Question
Download Solution PDFWhich of the following is best gauge/machine to inspect the parallel screw ring gauges?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Comparators:
- Best choice for inspecting parallel screw ring gauges because:
- They provide high-precision measurements of diameter, taper, and parallelism.
- Devices like dial indicators or optical comparators can detect micro-level deviations.
- Limit gauges are used in inspection because they provide a quick means of checking.
- The Go and No-Go principals of gauging are that the Go-end of the gauge must go into the feature of the component being checked and the NOGO end must not go into the same feature.
- There are various measuring instruments used for checking the thread.
|
Screw pitch gauge |
Used to check the pitch of external and internal threads |
|
Screw thread plug gauge |
Used to check the internal threads |
|
Screw thread ring gauge |
Used to check the external thread for its accuracy |
|
Screw thread calliper gauge |
Used for checking external threads. This is a highly efficient type gauge and uses more than ring gauge. |
Pitch Diameter Measurement of Ring gauge
- The measurement of the pitch diameter of individual ring screw gauges is undertaken only when necessary. Instead, they use of check plugs is quicker and preferred.
- The direct mechanical measurement of the pitch diameter of parallel screw ring gauges is practeciable only by the use of measuring machines of special design.
- The NPL displacement method is used for measuring the pitch diameter of internal screw threads.
- The basis is to measure the pitch diameter of a screw ring gauge by comparison with the "Pitch diameter" of a precision annular grooves in a solid cylindrical plug, i.e. comparators are used to inspect the parallel screw ring gauges
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