zeroing a Starrett micrometer

[87GN]

I have an old Starrett micrometer that shows 0.001" when closed. It has no. 230 on the part that rotates. How to I zero ii? Thanks
Mark

 

[Mintgrun]

I believe this video covers your question, but it has been a while since I watched it

He put out loads of information, which is awesome.

https://www.youtube.com/playlist?list=PLBC69869E8CB708F2

https://www.youtube.com/playlist?list=PL6HIFled82YXCXpWVcoMvHxr7_qQsXkzR

(edit: he answers your question eight minutes into the first video)

 

[87GN]

Thanks. That helped a lot.

 

[drivesitfar]

87: good question

Mint: thanks for posting the video. the old guy goes through it at a slow pace, but i wasn't sure how to use or repair/adjust these since i'm not a machinist.

 

[87GN]

Gave it a try. It seems that the part that gets adjusted is seized and won't turn using the spanner. Ok to shoot it with some pb blaster?

 

[drivesitfar]

87: i don't think PB blaster or Kroil will damage stainless, but read the label. or maybe even a few drops of 3 in 1 or other oil might just be enough.

 

[87GN]

Thanks. I'll see what happens.

 

[disston]

I'm not a machinist but I have taken micrometers apart. Merely unscrew the top part. The your PB Blaster or whatever can reach inside where the threads are. Sometimes they can be a bit finicky to get back together. Turn the threads backwards until they click in place then you can turn them forwards to assemble.

Micrometers are made to be taken apart for cleaning and lubing. The should have very light oil on the threads. Starrett actually makes it's own micrometer oil. I use it for anything that needs a light oil.

I use micrometers for rebuilding transmissions in my hobby motorcycle work.