Machinery's Handbook, 31st Edition
788 CALIBRATION OF REFERENCE SETTING STANDARDS the gage block and gently bring the indicator to the zero indication. Lock the head into position. Seat the gage block, re-zero, and assure the measurement is repeatable. 4) Remove the gage block and replace with the UUT. Assure that the UUT is seated and the measurement is being read at the peak (highest reading) for radius rod ends, or the parallel point (lowest reading) for flat rod ends. Assure radius is centered on the anvil and spindle. Verify the reading is within the tolerance limits as defined in Table 9. 5) Setup the universal horizontal measuring machine for the next size UUT as described in Items 2) and 3). 6) Repeat measurement as described in Item 4). 7) Continue the process through the range of the universal horizontal measuring machine or until all UUT in the set have been measured. If the UUT length in the set exceeds the length of the universal horizontal measuring machine, proceed to Item 8) for the process to measure the remainder of the set up to 40 inch (1000 mm).
Gage Block Stack Heigth Transfer Gage
Meter
Reference Standard
Surface Handle Electronic Height Gage
V-Block Fig. 22. Vertical Measurement of Reference Setting Standard 8) Using a precision V-block, clamp the UUT into the V-block ensuring the rod end is in contact with the surface plate and the UUT is secured in a vertical orientation. 9) Using either a height transfer gage or a gage block, set the electronic indicator to a zero indication. Set the range and resolution of the indicator so as to adequately indicate the deviation from zero in relation to the tolerance limits assigned to the UUT. 10) Repeat the zero indication several times to assure no drift or error has occurred. 11) Move the indicator from the standard to UUT and seek the highest point (for radius ends) or sweep the flat rod end for deviation from nominal and indication of parallelism. 12) Confirm that the indicated deviation is within the tolerance limits as assigned to the UUT in Table 9. Table 9. Size and Tolerance for Inch and Metric Reference Standards ( ASME B89.1.13-2001 ) English Metric Length (in.) Tolerance (in.) Length (mm) Tolerance (mm) 1 ± 0.00005 25 ± 0.0012 2 to 4 ± 0.0001 50 to 125 ± 0.002 5 to 8 ± 0.00015 150 to 200 ± 0.003 9 to 11 ± 0.0002 225 to 275 ± 0.004 12 to 18 ± 0.00025 300 to 425 ± 0.005 19 to 24 ± 0.0003 450 to 575 ± 0.006 25 to 36 ± 0.00035 600 to 750 ± 0.007 37 to 40 ± 0.0004 775 to 900 ± 0.008 13) Repeat Items 8) through 12) for the remaining reference setting standards in the set.
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