Patent ID: 8209873

Claim:
A size adaptive base for holding micrometers used in measuring screw threads using the 3-wire method comprising: a pedestal base unit; a vice jaw section on said pedestal base unit of the thread measuring apparatus to accommodate a variety of micrometer sizes; said vice jaw section including a fixed part on said base pedestal unit and a separate movable jaw portion; said movable jaw section having a clamping screw locking the micrometer at a predetermined holding angle and position with the anvil over a well center of said base pedestal unit; a resting ledge for a frame edge of the micrometer located on said pedestal base unit to accommodate a micrometer of a predetermined large size; at least one insert spacer positionable between said pedestal ledge and an edge of a frame of said micrometer to lift up at least one second micrometer at the proper position with the anvil at the well center.