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One hand operated depth gauge

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sbwhart:
I came across the design for this depth gauge in a 1920 ish American Machinist magazine, it can be use with one hand.







You can salvage a spring from a liquid soap dispenser



to use simple press the rod to depth



then with your caliper zeroed on the bar, simply take the direct measurement of the rod



I've attached the drawing if you want to make one



Stew

Meldonmech:

  Hi Stew

                    Another useful tool, I have down loaded the drawing.

                                                           Thanks David

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