AS 1001-1970 pdf free.Plain Setting Rings For Internal Measuring Equipment.
1 SCOPE. This standard relates to plain setting rings primarily intended for use in setting internal diameter measuring equipment.
The standard covers metric rings in the range from 2 mm to 150 mm, and provides for three grades of accuracy, viz, AA, A and B.
It specifies material for the rings, their hardness, surface texture and recommended overall dimensions (outside diameter and thickness).
2 MATERIAL REQUIREMENTS.
2.1 General. Setting rings shall preferably be made of good quality steel suitably hardened and stabilized and free from inclusions.
The measuring surface of a steel setting ring shall have a hardness value of not less than 780 HV or 62 HRC (after stabilizing).
Other materials may be used only if the setting rings produced have properties of hardness and stability at least equal to those specified for steel setting rings. Hardness shall be tested on the portion of the end face adjacent to the bore and shall be carried out in accordance with AS B84* or AS B106t.
2.2 Stabilizing. It is the responsibility of the manufacturer to ensure that setting rings are adequately stabilized by a method appropriate to their material.
3.2 Finish of End Faces. Both end faces of the ring shall be finished by grinding and all edges shall be chamfered or rounded.
3.3 Supporting Face. One end face of the ring shall be deemed to be the supporting face and should preferably be devoid of any marking.
The supporting face shall be reasonably flat and when placed on an accurately flat surface the ring shall he fl-cc from rock.
The axis of the bore shall be square to the supporting face within 1 um per 1 mm.
5.3 Uniformity of the Diameter. Within the middle half of the length of the ring the cylindrical measuring surface, as measured with a two-point contact, shall he uniform in diameter, to within the values given in column 2 of Table 3.
5.4 Roundness. The departure from roundness is defined as the difference in radii of two co-planar concentric circles, the annular space between which just contains the profile of the surface examined.
When assessed in accordance with AS B219, the departures from ideal roundness, measured within the middle half of the length of the ring, shall not exceed the values given in column 3 of Table 3.
5.5 Measured Size. The mean diameter of a setting ring shall be taken as the mean of at least four diameter measurements made at the mid-plane. This diameter should not depart from the nominal size of the ring by more than the values given in column 4 of Table 3.