How to use the Dorsey Standard Dial Bore Gage

The following information is provided by the manufacturer. We have paraphrased it to some extent. The original instructions are included with new bore gage purchases. Information on new Dorsey bore gages can be found on page 71.


Measuring head fastening screw (lock screw)

The fastening screw (called "Lock Screw" by the manufacturer) is set at the factory and does not need to be adjusted unless the user needs to rotate the dial indicator so that it faces sideways. Naturally, if the measuring head and the indicator have been taken apart for repair or replacement, then these instructions apply as well.

  • Loosen the lock screw
  • Rotate the indicator into the desired position
  • Assemble the two parts (measuring head and dial indicator) until there is contact causing the hand to move
  • Back off slightly so that there is a very small gap between the two
  • Tighten the screw being careful you don't use so much force that you strip the threads
  • Check for travel by pressing the gaging plunger with your fingers (there should be about .030" overall travel on the dial)





BesTest and TesaTast Indicator Repair Manual … page 177
Starrett 711 Last Word Indicator Repair Manual … page 199
Interapid Indicator Repair Manual … page 208
Compac Test Indicator Repair Manual … page 194
Mitutoyo Test Indicator Repair Manual … page 102

New! Companion Reference Guide for Test Indicators … page 178

Long Island Indicator Service Inc
14 Sarah Drive
Hauppauge NY 11788 — USA

Contact usShopping CartSales TermsRepair ServiceHome

This page's most recent revision: 15 April 2019
All Rights Reserved

Original photographs and content copyright 2019 by JWGrum


Long Island Indicator Service Inc

Precision Tool Repairs, Sales & Spare Parts