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From: Snag <Snag_one@msn.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: Inside micrometer
Date: Mon, 8 Jul 2024 21:29:49 -0500
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On 7/8/2024 7:15 PM, Bob La Londe wrote:
> On 7/8/2024 11:08 AM, Snag wrote:
>> On 7/8/2024 12:41 PM, Snag wrote:
>>>    I scored an older unit complete with all the rods ...but they are 
>>> not set correctly . The 1.5-2.5" is off by about .009" short of 1.5 
>>> when the thimble is zeroed . Looking into the end that goes into the 
>>> head I see a setscrew . I think this is used to set the rod length 
>>> but I want to be sure of procedure before I go reefing on it . The 
>>> other question I have is about the "extended" setting . The head only 
>>> has .500 of travel and there are 2 setscrew dimples in the mounting 
>>> sleeves . When in the "long" dimple it's about .050" short .  I 
>>> suspect there must have been a .500 sleeve that set the proper length 
>>> in the long position . Any help will be appreciated !
>>
>>    I guess I should have mentioned this is the Sherr-Tumico unit I 
>> posted about last week .
> 
> 
> I wish I had something constructive to say... so instead I'll say this, 
> "If you can make it give you useful readings it probably isn't wrong."
> 
> Yesterday I drilled and tapped a mold for bolt on hinges.  (Shop made 
> hinges) One hinge was 1/16 inch off on all three holes.  I put a washer 
> in between, and not only does it work great, but it looks cool like a 
> layered knife scale.
> 
> After correction I reprinted my print and stuck it to the mill with a 
> magnet.  Then I shipped the mold.  Now the print clearly shows a washer 
> used as a spacer in the lower hinge.
> 
> 
> 

   There ya go , making lemonade again ! I've done a little poking 
around , there is a .500" spacer missing . Length adjustment is going to 
be easy , that is a setscrew in the sleeve . The rods are threaded so 
all I need to do is figure how much and which way to adjust them . For 
now I'm going to get the 2.5 - 3.5" rod set up so I can fit a couple of 
cylinder sleeves . Gotta be pretty accurate on this one , the cast 
aluminum (water cooled) cylinder block walls are kinda thin and I'm 
afraid if I put too much interference on the fit I'll crack one . That 
would be a Bad Thing .
-- 
Snag
   Illegitimi non carborundum