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?
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?
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!
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?
ReplyDeleteA 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?
ReplyDeleteI spent 40 years dealing with this measurement standard. We routinely hand shaved babbitt bearings
ReplyDeleteusing 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!