Importance

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Abstract

A head assembly is provided for use in a bore gauge and is adapted to actuate either a mechanical readout, such as a dial indicator, or an electrical readout, such as a linear varible differential transformer connected to a digital display. A U-shaped centralizing arm pivoted to the body of the head assembly is provided with a pair of floating centralizing ball contacts. A first measuring ball contact is mounted at the outer end of a threaded extensible stem bearing a graduated scale and adapted to be adjusted as to radial extension. A second sensing ball contact is mounted for adjustment on a resiliently mounted finger which drivingly engages a transfer rod. The transfer rod is operatively connected to the readout device whether a dial indictor or LVDT. A ball and groove driving arrangement is provided between the transfer rod and the pivotal finger.

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First Claim