Friday, February 3, 2017

And Back In The Day.. I Thought My Uncle Ralph, The Contractor, Was Busting My Ass....












  Although , nowadays.. they are a rare species.









3 comments:

  1. A long time VERY ago an aircraft mechanic told me I needed to shave 1RCH off a piece I was working on. When I gave him a quizzical look, he explained that a Red Cunt Hair was the finest unit of measure ever created. So, that begs the question, is that ruler marked in regular CH units or RCHs?

    ReplyDelete
  2. A VERY long time ago an aircraft mechanic told me I needed to shave 1RCH off a piece I was working on. When I gave him a quizzical look, he explained that a Red Cunt Hair was the finest unit of measure ever created. So, that begs the question, is that ruler marked in regular CH units or RCHs?

    ReplyDelete
  3. I spent 40 years dealing with this measurement standard. We routinely hand shaved babbitt bearings
    using Prussian Blue to measure contact area between journal and bearing. As a Millwright, I used
    a massive 3/4" air drill suspended on an a-frame via slings and chain-fall to drive a 32" cylinder
    hone. The horizontal cylinder sleeve was at least 30" in length. It was all done by feel; Push,
    pull, push, pull etc., occasionally increasing tension.

    I routinely achieved .0005" precision correcting for out of round, egg shape, barrel shape (), and
    hourglass )(.

    This one has graduations of .03125 1/32".

    There is a pocket scale version this graduated in 1/64", or .015" or 1 (red cunt hair.) So sayeth
    the Society Of Mechanical Engineers!


    ReplyDelete

Leave a comment.. Let me know what you think! :)