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162 THE DISTRIBUTOR’S LINK LARRY BOROWSKI GAGING SYSTEMS - PART 2: SYSTEM 22 from page 108 Internal Threads, ASME B1.3 – 2007 Table 4 In this table you will find that System 22 requires the following features to be checked. Under each feature the acceptable gages are summarized. These acceptable gages are detailed in table 2 of the standard. Note: An internal thread smaller than a #10 or M5 is not required to be evaluated/inspected by system 22 gaging. SAE AS8879, Table 8 states; For internal threads of nominal size less than .1900 inch, only the functional diameter limit and minor diameter limit inspections are to be performed. ASME B1.2 states; Internal product threads less than 3/16 in. in diameter are not practical to check with snap gages or indicating gages. GO Maximum Material ¤ Go Threaded Plug Gage (Full form Go plug gage for MJ only). ¤ Go Rolls or Segments for an indicating gage with 120 or 180 degree contact points. Note: You are checking the Functional Diameter using either a Go plug or some type of direct measurement gage that will evaluate multiple threads at the same time. The minimum Major diameter limit is acceptable when the product passes the Go plug gage. ¤ Thread Measuring balls with suitable measuring means ¤ Linear Measuring Machine with required accessories ¤ Coordinate Measuring Machine with required accessories. Note: You are checking the Pitch Diameter, by isolating a single thread at a time and using some type of direct measurement gage. An actual value is required. Minor Diameter ¤ Full Form Go Thread Plug (MJ only) ¤ Minimum (Go) and Maximum (Not Go) Plain Cylindrical plug gage for minor diameter. ¤ Minor diameter type indicating gage ¤ Optical comparator and toolmakers microscope with suitable fixturing and cast replica. ¤ Linear measuring machine with required accessories ¤ Coordinate measuring machine with required accessories Note: You are checking the minor diameter using either a go/nogo cylindrical plug gage, or some type of direct measurement gage. Minimum Material (Pitch Diameter, Groove Diameter) Note: Not Go functional diameter is another option, but control of lead (including helix) and Flank Angle (over the length of the full thread) must also be demonstrated. This option is only acceptable by agreement between purchaser and supplier. ¤ Thread indicating gages, minimum material, pitch diameter type (cone and vee) with either 120 or 180 degree contact points. ¤ Thread indicating gages, minimum material, thread groove diameter type (cone or best wire size radius profile) with either 120 or 180 degree contact points. ¤ Pitch Micrometer with Modified Contacts (approximately pitch diameter contact) Cone and Vee TYPICAL INTERNAL VARIABLE THREAD GAGE – “BI-POINT” GAGE System 22 measurements require more than just pass/fail results, some characteristics require a numerical value. Remember that the lists of gages above are all the acceptable forms of gaging that can be used to check a characteristic. Acceptance by any one gage in current calibration specified for a characteristic shall be the criterion for acceptance of that characteristic. LARRY BOROWSKI | GREENSLADE & COMPANY INC
THE DISTRIBUTOR’S LINK 163 MID-ATLANTIC FASTENER DISTRIBUTORS ASSOCIATION 2021 HOLIDAY GALA
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