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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.
This depends on the original specification of the device and upon it's current condition. Mechanical gage calibration deals with this all of the time, when they calibrate these devices against known standard fixed dimension gages. These reference gages also have uncertainty as well. But in general, good quality "thousandths" inch micrometers are typically good within about 1/3 of a thousandth across their entire range. Good quality "tenths" mics in good condition are expected to be within a ten-thousandth across their range.
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)
You have a nice micrometer! Your problem could be caused too many different things. I would take the lead screw spindle off first and then clean both assemblies. (You can use W-D 40) this will allow you to clean the I.D. I do not know how much you understand how a micrometer works and would caution you not to adjust any of the adjustmants on the micrometer because it could end up out of calibration. I would be happy to take a look at it and free it up and calibrate it for you! I was the Manager and working Supervisor of a precision Tool Room for over 25 years and have quite a selection of parts. I would not want any compensation for the help and I would just ask that you include a prepaid return package. I am retired now and miss the work and I am constantly cleaning all my tools and I could do it then. Here is my e-mail address firstname.lastname@example.org
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.
My experience in this type of repair spans over 18 years of Calibration experience in working for a Major Automotive Supplier.
So I will attemp to walk you through this. There are several different models of micrometers and each manufacture has a different design. Most of my expertise is with Mitutoyo, Bown&Sharp and Starrett. There could be a couple of other under lying problems due to the "overtightening".
One: could be due to a scratch on the spindle "barrell" from trying to rotate the spindle when it was locked.
Two: the spindle could actually be bent.
Three: If left in the lock position for a period of time, it could have a slight bit of corrosion on the spindle.
If at all possible, remove the lock, loosen the spindle and remove the spindle completely. Place the spindle on a known flat surface. If you have a granite surface plate that would be perfect, if not try a smooth glass top. The idea is to check the spindle to see if it is bent by rolling it and checking for straightness. If it is bent or badly scratched, then it would be cheaper to just purchase a good micrometer from eBay than to try and get parts.
If it is not bent then it could be corrosion so clean with a pure grade alcohol and reassemble.
If you still have the tightness, then it could also be an alignment issue and that is just going to take a lot of patience, and it still may be cheaper in the long run to replace it.
Most precision mics will not tolerate harsh treatment or environments, so be careful..........hope this helps....