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Old 24th June 2012, 09:17 PM   #31
DF96 is offline DF96  England
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Old fogies like me still think in imperial, but calculate in SI.
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Old 24th June 2012, 09:28 PM   #32
7N7 is offline 7N7  United Kingdom
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Of course Metric measurements will have to be used; that's quite obvious, sadly it's the way things are.

I dislike the Metric system, partly because it reminds me of Bonaparte's arrogance, but principally because all the values are useless either too big or too small. The Imperial measurements are human in scale and conception and have the added advantage of fractions, apparently a closed book in the Metric world. I think that fractions are lovely things.

I should add that I am perfectly at home with Metric having been something of an Italian car specialist for more years than I care to mention.

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Old 25th June 2012, 10:44 AM   #33
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I will never understand how can someone, only with a quick look, realize how long is something like 3 1/23 inches or 5 1/7 inches. Why not just say 3,043" or 5,142"?

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Old 25th June 2012, 10:52 AM   #34
AndrewT is offline AndrewT  Scotland
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What's wrong with ~77.3mm & ~130.63mm?
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Old 25th June 2012, 11:05 AM   #35
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Metric is far more easier to use than imperial. Try adding 3 1/23 and 5 1/7 in your head and it should become pretty clear. Metric has the advantage of decimalisation perfect compatability between units, so no conversion whatsoever. Imperial measurements may be human in scale but they neglect the fact that our number system can only work in powers of 10.
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Old 25th June 2012, 11:15 AM   #36
7N7 is offline 7N7  United Kingdom
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I have never heard of anyone using such fractions as 1/23 or even 1/7 in measurement applications; the beauty is though they can be used if at all necessary.

I like the fact that base 12 can be divided by 2,3,4 and 6, and that the fractions used traditionally in measurements were all base 4 - 3/16, 1/4, 1/8, 9/64 and so on.

And defeating my own argument, was there ever a better unit for engineers than the "thou"? It's just the right sort of size, microns being quite ridiculously small.

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Old 25th June 2012, 11:18 AM   #37
DF96 is offline DF96  England
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Quote:
Try adding 3 1/23 and 5 1/7 in your head and it should become pretty clear.
Easy: the answer is 8 and a bit.

Quote:
our number system can only work in powers of 10.
If you work with computers you quickly learn to do arithmetic in octal or hexadecimal too. Some trades used to routinely work in dozens or gross. There is nothing special about 10 as a number base, except for those who still count using their fingers and toes.
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Old 25th June 2012, 11:30 AM   #38
AndrewT is offline AndrewT  Scotland
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8 and a bit
ral (rolling about laughing).

That bit is 30/161, everyone is familiar with that fraction, it's ~0.188635........
3/16" is 0.1875"
8 3/16" is pretty close. 207.93mm is closer,
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Old 25th June 2012, 12:09 PM   #39
DF96 is offline DF96  England
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Perhaps we should remind younger viewers that fractions of an inch were usually based on powers of 2 (i.e. binary fractions) so adding was made easier. 1/16 + 5/32 = 7/32 - anyone over about 40 can do that in their head.
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Old 25th June 2012, 12:11 PM   #40
AndrewT is offline AndrewT  Scotland
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But, 94% of the "under 40years" population can't do any arithmetic "in their head".
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