| 摘要 |
For measuring machined recesses having angled side walls with high accuracy and for measuring narrow grooves machined in workpieces, caliper legs are equipped interchangeably with contact ball extremities and narrow right angular leg extensions for use in measuring machined grooves. An interior workpiece contact pin electrically insulated from the contact ball extremity is electrically connected through a leg of the calipers with a first light emitting diode, while the contact ball extremity is similarly electrically connected with a second light emitting diode. The other leg of the calipers may constitute an electrical ground. A machinist user of the device endeavors to light both light emitting diodes by bringing the ball extremities into tangent contact with machined recess side walls while the interior contact pin is engaged with the bottom of the recess. In a different embodiment of the device, four diodes must be illuminated to assure the correct measurement. A positive and precise operating mechanism for the pivoted caliper legs is provided.
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