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Metric V Imperial

And not only do US gallons have fewer fluid ounces in them than Imperial gallons, the fluid ounces are different sizes. How on earth does that come about?
 
Northumbrian said:
And pic shows my Engineering bible…..remember them?
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Even before I got one of those the company that I was working for produced their own in-house version.

This was Plessey Radar in 1968 - that's fifty five years ago.

Progress to date on standardisation - ZERO ZILCH NADA
 
Northumbrian said:
When I was Toolmaking, jumping from imperial to metric measurements never bothered me. You got used to working in both, been off the tools for 35 years, but conversions like 0.1 mm = 4thou you never forget.
When it comes to screw threads, that’s where Metric rules, it was Metric, metric fine or metric course.
the imperial nightmare as mentioned, BSP, Whitworth, BSF, BSW, UNF, UNC, ANF, ANC? BA,….used to do my head in.
And pic shows my Engineering bible…..remember them?
View attachment 180374
Click to expand...
mines in the tool box in the shed
 
Uglybeard said:
And not only do US gallons have fewer fluid ounces in them than Imperial gallons, the fluid ounces are different sizes. How on earth does that come about?
Click to expand...
The USA continued with the British avoirdupois system after independence but the Britain introduced a new standard Imperial measurement system (based on avoirdupois) in 1824. The USA never adopted the new Imperial standard measurements. Hence the divergence.
 
I suspect that as long as the USA sticks religiously to imperial then it will carry on to some extent here. As older people die off the need to keep it will diminish. I'm 57 and school was exclusively metric. It's not just frustrating but can be downright infuriating and even dangerous. I remember one pilot ordering enough fuel for his next flight in kilos and that number pumped in in lbs. The plane ran out of fuel and crashed. I also remember a mission to Mars hitting the planet at full speed because of a simple mix up of units.
 
I remember, forty years ago. being corrected by at a timber yard when i asked for 3x4

"It's 75x100mm now"

"OK, sorry"

pause

"How many yards d'you need?"
 
I just use gallons, pints, miles, yards, feet, inches, stones n pounds n ounces, and use the pellet weight in grains to calculate ft lbs for my guns....
ATB
Dan
 
I was raised to work with both, so 25.4mm/inch, 39.6 inches/meter, 1.14 yds/meter, 1.14 yards/meter, 28.73g/oz, etc

So now I can get things wrong according to both systems...
 
Why is it hard?
Can you only think in one metric (sic)...

I can quite happily relate to a litre or a pint and mm and inches or even miles and km 🤷
 
It’s really not that hard to be proficient in both , at school it was metric, working and taught by dad it was imperial, learn both it’s far better , and im nearly 50
 
Stanoz said:
That is because for BSP threads you measure the outside diameter and then deduct 0.25" (1/4") So for example if it is 1" O.D. it is actually classified as 3/4 BSP
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Good approximation but 1/2" BSP is a little over 3/4" and 3/4 BSP is more than 1". For more confusion, if parallel,threads are designated
G1/2 and G3/4 with no mention of BSP. Much of what comes out of China looks like BSP but is actually NPT for the USA market.
 
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