Help with Starrett 216 mechanical digital micrometer

[scooternut]

UPDATE: Solved, below.

Please help if you can. I had bright idea to disassemble and clean my mechanical digital Starrett 216 mic, thinking the barrel just threaded off like all the others.

In hindsight, this makes no sense, as it engages internal gears.

It threaded out, counted the numbers to a whacky place, and then basically became stuck here. I can neither remove it, nor thread it back in.

I'm able to move it in slightly, which will make the numbers turn, and also pull it out slightly to put it in a sort of neutral where it spins free.

Please, anyone know how to properly re assemble. I have broken the two covers loose and looked at the internals, but went no further. I left a message for tech support at Starrett, no idea if they'll help yet.



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[rlitman]

You can find an exploded diagram of your model here:
http://www.starrett.com/multimedia/starrett-3d

 

[66cj225]

are there any flats on the exposed barrel? The knurled nut is suspicious. Use to take these problems to the morning or afternoon break and somebody know.

 

[scooternut]

The diagram is a 3d model, not an exploding diagram. Learned that after wasting time downloading the software required to view it.

The knurled piece is not a nut, but a lock for the mic, and the barrel is round.

Thanks for the thoughts guys.

 

[rlitman]

The diagram is a 3d model, not an exploding diagram.

You can uncheck any part you want to reveal hidden parts inside.

 

[66cj225]

Stay calm, it has been done many times before.....somebody will know.

 

[scooternut]

First off, much credit goes to Starrett. They gave me a very impressive response including 1 phone conversation with a parts (or "paahts" ) man, and 2 emails from actual people, one of which included a PDF document detailing procedures with this particular micrometer. The instructions were advanced and required knowledge of a mic and its parts/ operation, but was exactly what I needed to get her apart, cleaned, back together, AND zeroed.

The quality of this company clearly extends beyond the quality of their parts. Thank you Starrett, specifically Paul and Paul! I do like this mic quite a bit and am very happy to have it back in use.

 

[scooternut]

The procedure as i discovered is to:



-back the spindle out until approx 1/4 or less is protruding from the frame

-slide the sleeve(where the graduations are on a normal mic) inside the thimble/ barrel. Nothing hold this but a slip fit. The knurled lock will remain in place.

- look for a hole in the works under the sleeve (see pic of hole and screw removed). Turn the spindle until you expose a small screw. Unscrew this and then the spindle will turn out like a normal mic.

-as to zero, the entire number assembly removes as one unit. You turn it to zero, then reinsert at your standard or at zero.



I will follow up with pics.

 

[bob15]

Glad they were able to help!

 

[Shiseiji]

Thank you! I purchased a NOS 216 and it's gummed up. Mine included the instructions "Do not back spindle face into the hub of the micrometer frame. Attempting to remove the spindle will cause damage to drive gear. If repair is necessary, please return to: [Starrett address] " but I figured "someone" else must have been down this road!