Depth Micrometer Adjustment - Starrett No. 449az

[bug_hunter]

Afternoon,

I have a Starrett No. 449az depth micrometer that measures about .002 off when on a flat surface. The micrometer has that standard knurled ring for gross adjustment. a locking knurled ring, and a ratcheting knurled ring. There is also a slotted screw in the top of the ratcheting knurled ring. Can anyone out there school me on the zeroing of this tool?

Thanks,

Greg

 

[mmcmdl]

Zero the rod on the end . There's an adjustment nut .

 

[bug_hunter]

I assume you are referring to this adjustment nut.

How would one suggest I adjust this nut .002 without destroying the nut or rod? It is more than finger tight.

 

[mmcmdl]

That's the one . The nut is a slight interference thread. You should have this wrench in the case . Just grab the rod and turn the nut whichever way you need , it's split . Don't mar your rod !

 

[bug_hunter]

No wrench, no box, but I got the idea.

Used a small adjustable wrench on the nut and another on the rod with a cloth. Adjustmnet was a success.

Thanks a bunch!

 

[mmcmdl]

Thanks a bunch!

Good work ! you're Welcome also .

 

[ChazzC]

Glad you got it worked out.

Two things I learned from my previous “Guy at Starrett” (I have a new one now):

1) Don’t be afraid to use more torque than you think you should, as long as you carefully clamp/protect the components.

2) Starrett repair techs soak incoming tools in Marvel Mystery Oil for up to a week before servicing to loosen crud.

 

[bug_hunter]

2) Starrett repair techs soak incoming tools in Marvel Mystery Oil for up to a week before servicing to loosen crud.

Thanks for the follow-up. Given that I was using TOO BIG of tools, I don't think I would have gotten to the soaking stage.

But it did indeed take a bit more torque than I expected, but I was very carful.

Thanks again,

Greg

 

[CJ5Dave]

Not to hijack, but I just bought a Browne and Sharpe depth mike with wrench and no instructions. How do you swap rods?

 

[bug_hunter]

No problem on the hijack. My questions were answered.

On mine, on top of the ratchet spindle, there is a small screw. I removed that screw, the ratcheting spindle and another knurled ring (lock ring?), and the rod came out the top. Hope this gives you a little insight.