Question about Fowler Outside Micrometer Set 0 - 4"

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Micrometer trouble I have a 2" to 3" outside micrometer. The lock ring was overtightened and now the barrell will not turn as smoothly. Can I fix this myself?

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Have you looked at the granite surface plates? I think that it would work really well in this situation. I think that they are sturdy enough that they could get you the stability that you need.

Posted on Jan 18, 2012

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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....

Posted on Dec 11, 2008

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Posted on Jan 02, 2017

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