Reference ASME B89.1.17-2001
Attributes to be inspected:
Suggestions for improved accuracy:
Calibrate only in the central middle half of the thread measuring wire.
Thread measuring wires are calibrated on a functional basis so as to compensate for deformation when the wires are being used.
Refer to ASME B89.1.17-2001 for measuring force and contact point configurations.
Wires must be unrestrained during measurement. They should be held in place by the specified measuring contact force only.
The set of 3 wires in a set must be calibrated at the same time to ensure the commonality of size standard is met. Each wire in a set must have the same diameter within .000010”.
Handle all thread measuring wires with care. Wires should be handled with soft tip tweezers.
Allow adequate time for thread measuring wires to normalize. Use a normalizing plate adjacent to the measuring equipment.
|Attribute||Normal Laboratory Conditions||Optimum Laboratory Conditions|
|Wire Diameter||+/-0.000025”/ 0.00064mm||+/-0.000015”/ 0.00038mm|