There is no easier way to make measuring errors with serious consequences than to use a micrometer that has not been set to zero. Before use, even with a brand new micrometer, be sure that it is set to zero. The manufacturer admonishes us to "observe the following points to correctly zero adjust the micrometer." .
With the spindle closed on the 0-1" micrometer, or closed onto a micrometer standard for larger micrometers, the zero of the barrel should coincide with the zero on the rotating thimble. For instance, on a 1-2" micrometer you must insert a 1" standard and close the thimble. If the zeros don't line up, use the wrench which came with your tool, hook it around the barrel so it fits into the small hole and gently turn the barrel until the zeros line up. If the barrel won't budge, use the back of a screwdriver to gently tap the wrench. Old micrometers may have become corroded and the barrel won't move. In this case you'll have to send it in for reconditioning. Micrometer wrenches are available if you've lost yours.
It follows that zero-setting a 2-3" micrometer requires a 2" micrometer standard (measuring rod), a 3-4" will require a 3" measuring rod, and so forth. Further information on measuring rods can be found on page 58.
More About Micrometers
There is no question that Amazon can offer you the best prices on almost every kind of precision measuring tool. They also offer easy no-questions-asked returns and often free shipping. The small distributor simply cannot compete. That's why we include this link so you can go directly to Amazon and see what they're offering.
Two things to consider:
Companion Reference Guide for Test Indicators
$19.50
Now available at Amazon.com
14 Sarah Drive — Hauppauge NY 11788 — USA
Disclosure: Although most of the links on this website allow you to make a purchase directly from us, some links may direct you to Amazon. Any purchases you make from those links will result in a commission for us. That commission helps to pay for the construction and upkeep of this web site. We are grateful for any purchases you make through those links.
Privacy: We do not collect any information while you are visiting this website unless you proceed to place an order. If you place an order, your information will be kept confidential and will not be sold or made available to any other entity. If one of our links leads to Amazon, their privacy statement should be considered.