Question about Starrett 50443 12 Machinists' Improved Level #98 12

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How do I calibrate a Starrett model 449 depth micrometer?

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Try the starrett web site. You can chat with them there about it. The adjustments are fair easy to do.
http://www.mytoolstore.com/starrett/micro029.html

Posted on Oct 30, 2011

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How to reset depth micrometers , any style , easiest method for Mitutoyo line


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.

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1 Answer

Starrett no. 440 depth micrometer turns hard, and the lock nut is not the issue. it even turns hard when the style rod is completely out of it. I think it may be a little rusty on the inside.


Sounds like you might be on the right track in thinking there is some corrosion. Do you use the micrometer regularly? Did this problem appear suddenly? Try a little WD-40. If rust is significant, i recommend using some naval jelly to remove it. Remember, when it comes to precision instruments such as this, moisture is not your friend.

Hope this helps.

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1 Answer

3"-4" Starrett 436 micrometer: When spindle


do you still have the locknut wrench? you need to loosen the spindle. if not try an industrial supply store to get wrench.


hope this helps

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Spindle movement jammed


it has something stuck in it...do not try to force it
send it to an authorized Starret repair facility to be repaired

May 16, 2010 | Starrett T216XRL-1 - MICROMETER, DIGITAL

1 Answer

My model 449 starrett depth mic turns hard, how can I fix this?


Are you aware of the lock nut that keeps the barrel from turning? There is a knurled ring next to the base that rotates to lock and unlock the barrel with a clamping action. Check that this is not causing the problem. Turn to left to unclamp.

Oct 15, 2009 | Starrett 50443 12 Machinists' Improved...

2 Answers

Micrometers out of calibration


Micrometers must be calibrated at 4 spots around the barrel and at zero and full scale to be truly accurate. You will have to send it to a calibration lab or back to Starrett for a full calibration because they will check it with gauge blocks of known length and verify the spindle and anvil surface flatness.

If you are only concerned with the zero and not as much about the full accuracy of the tool, then you can reset the zero yourself. With the mic fully closed (spindle and anvil touching), turn the barrel with the funky, half circle shaped wrench that came with the mic in the box. There is a little hole in the barrel where the nub on the wrench will fit then you just turn it until it reads zero. Good luck.

Mar 07, 2009 | Starrett T216XRL-1 - MICROMETER, DIGITAL

2 Answers

Micrometer trouble


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....

Jul 31, 2008 | Fowler Outside Micrometer Set 0 - 4"

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