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Can I fix this mic?

Discussion in 'METROLOGY - MEASURE, SETUP & FIT' started by davesax36, Apr 17, 2017.

  1. davesax36

    davesax36 United States Swarf Registered Member

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    Hey, everyone. pretty sure this is one of my first couple posts. Anyway. My dad was going through some old family tool boxes and found this Mic. I've just started playing with a Sieg mini mill and lathe, so he brought it to me. Of course it's old and is frozen or something.

    Here's a video of the current situation. I'll soak it in ATF/Acetone if that's appropriate (I use it on bikes all the time for stuck/rusted things). Any help is appreciated.

     
  2. Ulma Doctor

    Ulma Doctor Infinitely Curious H-M Supporter-Premium

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    the mic is fully adjustable,
    a good soak in the ATF/Acetone mix will work just fine
    you'll need a standard to calibrate, a gauge block or other standard would suffice
    there is a nut that can be turned in the barrel of the mic body that can be adjusted with a small spanner wrench to compensate for wear or false reading
    when correct the barrel 0 will line up with the standards' length, adjust accordingly
    some of the old mics can be a bit finicky, but they usually can be brought back into spec in an hour or so of messin' around
     
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  3. kd4gij

    kd4gij United States Active User Active Member

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    Soak it. It will not heart it.
     
  4. ch2co

    ch2co United States Grumpy Old Man H-M Supporter-Premium

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    Hey Davesax36 Welcome to the forum! Tons of information to be found here. A veritable plethora of combined knowledge.
    We'd love to see some of your beginning projects and equipment. There is no question too stupid to ask. There is no shame in
    being a newbie or nube or newb or......
    Again welcome.

    CHuck the grumpy old guy (whose really a nubie himself.);)
     
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  5. whitmore

    whitmore United States Active Member Active Member

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    It's likely some of the old oil is gummed up. It'll take more than a soak,
    you'll want to actually disassemble and use harsh solvents (acetone,
    or maybe carburetor cleaner), or really hard scrubbing with
    a brass brush, on the threads, if that's the case.
    Under the (removable) handle/scale there's usually an adjustment nut
    that applies friction, it'll have to be adjusted too.
     
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  6. davesax36

    davesax36 United States Swarf Registered Member

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    Can't get it apart so far. Been sitting in acetone and goof off.

    Sent from my STV100-2 using Tapatalk
     
  7. Ulma Doctor

    Ulma Doctor Infinitely Curious H-M Supporter-Premium

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    you may need to add some horsepower to get it apart, but it will come apart

    PB Blaster or Kerosene would be my next move, then some persuasion, gently held in a soft jawed vise, with a pair of pliers.
    prepare the pliers with electrical tape on the jaws to prevent marring the thimble, and give a few twists counterclockwise to break it free- if you dare
     
    Last edited: Apr 22, 2017 at 12:49 AM
  8. tq60

    tq60 United States Active Member Active Member

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    Soak it in paint thinner as that is true lubricant and solvent in one.


    Do not rush...

    Soak in jar handle up then try turning both ways then place back in jar flipped over.

    Repeat.

    If nothing over a few days then heat it up with a hair dryer and try it.

    It will open up with time and effort.

    Avoid using pliers....we did that once...ruined it.

    Sent from my SAMSUNG-SGH-I337Z using Tapatalk
     

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