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Need Instructions for Bore Micrometer

Discussion in 'For Sale- Members only' started by cementman, Jan 22, 2010.

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  1. cementman

    cementman Member

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    Purchased a 4 - Guage Barrel Micrometer as manufactured by Custom Shooting Products (CSP), the same dial type as sold by Brownell's. Purchased on Gunbroker and seller does not have the instruction sheets. Understand that the use of this guage is simple enough but sure would like the detailed instructions. Anyone help me out and provide a copy of the instructions??
     
  2. mixer

    mixer Well-Known Member

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    I would think that you need to calibrate it first. If you have a tube/barrel of an absolute known inside diameter you would insert your mic in and set the dial to match. You might also be able to use a standard dial micrometer to calibrate yours.

    Eric
     
  3. cementman

    cementman Member

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    The micrometer as shown in picture does have the short barrel type cylinders to calibrate the instrument, I think. Would like detailed instuctions on the measurement.
     
  4. mixer

    mixer Well-Known Member

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    Find a calibration ring with the ID stamped on it, lets say it reads .700. Insert the end of your bore mic into the ring and see what it reads. Loosen the locking screw at the top of the mic and rotate the bezel until it reads .700, then tighten the locking screw. Now your mic is calibrated to a known standard.

    After that if you insert the bore mic into a barrel you'll get an accurate reading of the bore diameter, as you pull the mic towards and thru the choke you'll get a smaller reading. Say the bore reads .730 and the choke reads .695 that tells you that you have .035 thousands constriction or what is normally considered a full choke. Names are really unimportant, you could call the chokes Tom, Dick & Harry, numbers are what counts.

    Eric
     
  5. skeeljc

    skeeljc Supporting Vendor Supporting Vendor

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    Barrel micrometers are comparitive devices. They just compare the barrel being measured to a known dimension (the metal ring).

    Put the calibration ring on the device and set the dial to zero. You need to push on the rod that extends out of the top of the dial when you put the calidration ring on. Be sure the calibration ring is not cocked when you zero the dial. Then press the rod at the top of the dial and remove the calibration ring. When you are removing the calibration ring note which direction the dial indicator moves when you press on the rod at the top of the dial. That is the direction indicating less than the calibration ring. When you insert the bore mic in your barrel it will register how much larger or smaller than the calibration ring the barrel is. Take the reading on the dial (usually in .001" graduations) and add or subtract it from the calibration ring dimension.

    Jim Skeel
     
  6. cementman

    cementman Member

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    Would really appreciate if someone has the CSP manufactures instruction sheets. Have to believe they are out there.
     
  7. mkstephen

    mkstephen Active Member

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    cementman,

    Check your E-mail for the CSP instruction book I sent you.

    Plesse advise if you received it OK and if this works for you.

    Michael Stephenson
     
  8. cementman

    cementman Member

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    Thanks Michael, everything came thru perfectly. Also Thank the above responders and a special "Thank You" to the individual that emailed me detailed step-by-step instructions. Would like to single out this individual but after copying instructions, sending back thank you, deleted mail.

    Again, goes to show you what a great site this and people will take the time to help another out.
     
  9. cementman

    cementman Member

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    Did find the individual that provided the detailed step by step instructions. A special thank you goes out to Doug Braker, aka GunDr. Again to Michael Stephenson for the manufactures instructions.
     
  10. Robb

    Robb Member

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    cementman, Any chance you would want to forward those detailed instructions?

    Thanks
     
  11. cementman

    cementman Member

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    Robb

    Instructions sent.
     
  12. Robb

    Robb Member

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    Got it. Many thanks sir.
     
  13. Bob_K

    Bob_K Well-Known Member

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    Thanks for my set, cementman.

    Go Saints.
     
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