posted on Jan, 21 2009 @ 01:11 PM
How do you buy eggs in the US of A? In the UK, we tend to have them in modules of 6, so that if you have two of those you get 12; that’s a half
dozen and a dozen, so if that was converted to metric, it would be 5 & 10 packs, but a 5 pack of eggs doesn’t make sense.
Then if you buy a pound of apples, a person gets an amount they understand, whereas with a kilo they can’t get their head round it.
I worked for an automotive components manufacturer in the UK, with its head office in the USA. We were sent the designs from HQ of an air pressure
motor manufactured in the USA plant, which was in Imperial measurements, i.e. Feet and Inches.
Because of the European legislation, we had to convert the whole design and all of the components and sub-assemblies into metric for manufacture and
sale in the UK. The Chief Draughtsman compiled an easy look-up table for the draughtsmen to use when drawing the parts; this was before computer aided
design was in use.
We had years and years of failures in the field on heavy trucks, some of them going out of service as they were loading up at the docks. It was a
nightmare, and after years of investigation and thousands of free replacement motors being sent to trucking companies, the cause was found.
On some of the critical components of a certain size, the metric dimensions on the look-up chart had a decimal point in the wrong place. It was all
new to everybody and whereas a 3/8” component could be visualised by the draughtsmen, the metric equivalent was less easy to do.
If it ain’t broke don’t fix it; Feet and Inches are good.