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Generally, micrometers are "zeroed" to a standard -- an object of a known specific length or diameter. If you have placed a 7-inch standard in the micrometer and brought the spindle into proper contact with that standard, and then zeroed the micrometer at that point, it will be properly set to seven inches. Standard micrometer travel is only one inch, and only that range is usually displayed. The user must then add the standard length to the face display or thimble reading to get the "developed" measurement.
The nut on the end of each rod is for calibrations. On a clean flat surface check your reading at "0"and see if adjustment is needed either left or right on the nut for getting before zero or after zero readings. Adjust the nut as little as possible and re check for zero multiple times because the nut is sensitive. hope this helps.
This is based on an old Brown & Sharp guide book.
1. Carefully clean the measuring surface by pulling a piece of soft paper between the surfaces while the anvil and spindle are in light contact with it.
2. with the anvil and spindle apart, unlock cap with spanner wrench (supplied with unit), then tighten cap lightly with fingers to bring slight tension between thimble and spindle.
3. Bring anvil and spindle together by turning SPINDLE and set zero line on thimble to coincide with line on barrel.
4. Move spindle away from anvil by turning SPINDLE, NOT by turning thimble.
5. Holding thimble only, tighten cap with fingers. Do Not Touch Frame.
Lock cap with wrench, still holding thimble only, and adjustment is complete.
NOTE: Check zero setting after adjustment is made.
Hope this helps
i image the 6 - 12" is a fairly expensive set. you could buy the 0-1" which has the same thimble lock. i have one at home. and switch them out. can be bought $100 or less brand new. or search for an ebay bargain.ive never heard of the thimble lock go missing or break before. its doubtful mititoyo supplies replacement parts for mics.
yes. Just remove the screw in the lock, lift the lock arm off its shaft, and reposition at different angle. (put to lock, take off without turning, and set back on at unlocked position...may ned adjusting)
In order to reset the zero point for your specific micrometer, you will need to have a standard set of pre-set dimensional pin(s). You can check the attached link (page 71 of the Mitotoyo catalog) for the information you need). I guess you could try to find or make a pin with the same dimensions as those noted on the catalog page, but if you're using this in a manufacturing setting, you might have no choice but to purchase a set of gauges for calibrating your micrometer.