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    Testing home made level vials
    From: Randall Morrow
    Date: 2012 Jan 9, 10:32 -0800

       Here is the lash-up for testing level vial sensitivity during the lapping process.    A 4 foot level is resting on two short metal square tubes, (the scraps from the vial making jig).    You rotate the set-up until the bubble is centered.   As G.R. told me there is always a level in one direction on a plane and you turn until you find it.   Put rubber stoppers in the tube after filling and tape this on the level.    Put a feeler gauge under one end and measure the bubble movement with the math mentioned in my previous posting.      If it's correct you install the brass end-caps.   If it's too sensitive go back, do more lapping then test again.  

    Randall F Morrow PT
    Kern County - Bakersfield

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    File: 117757.vial-testing-process-with-level.doc
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