American and English imperial measurements.

Discussion in 'Bad Dog Cafe' started by Diytelecaster, Jul 2, 2019.

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Isn't someone going to chime in here and say they don't use no stinkin' ruler, they just do it with the magic feeling in their fingertips. Said fingertips being able to differentiate to the nearest ten thousandths of an inch.

2. studio1087TelefiedSilver Supporter

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Can't we all just divide and multiply by 10? I do this all day at work.

I have ten toes. Even I can figure it out. I don't have 12 or 36 or 5,280 of any outer body part.

The metric system here shouldn't be just for scientists and drug dealers.

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3. mfowler314Tele-Meister

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I've had the following conversation many times in my head - and someday will actually have it:

Me: I'd like a 16 oz cup of coffee

Starbucks: Is that a Grande?

Me: I don't know.... I want one this 16 oz

SB: Which one is 16 oz?

Me: I want two cups...

SB: Wait... you want two coffees?

Me: No I want one coffee - two cups.

SB: You want it in two cups?

Me: No.... I want two..... Oh never mind - just give me half a liter of coffee

SB: Huh?

Me: Or... 500 milliliters....

SB: .........

Me: OK... just give me a pint of coffee....

SB: .........

Me: Fine.... just give me the Grande!

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I use the penny, nickel, dime technique, so who cares?

During my career as an engineer, our company converted to metric about the same time as the U.S. was trying to convert to metric on our highways. Anyway, we had to convert our drawings to metric, but the moldmakers would convert back to inches for machining the tooling. It was a fiasco of losing tolerances to no end.

The world should have just gone metric back in 1799 when it officially started, but nooooo, everyone has to be different.

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5. unixfishDoctor of TeleocitySilver Supporter

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4/64 and 6/64 makes sense in this context because some "other guitar" measurements are 5/64. This way the denominator is always the same.

I get the point though.

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On the other hand, when you look at nut widths in inches, it's 1 5/8, 1 11/16 and 1 3/4

7. TexicasterTele-Afflicted

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It's rules of significant figures.

While 4/64 = 1/16.... if you're given 4/64 you need to be accurate to 1/64. If given 1/16 accurate to 1/16...

Same with decimals.. If I give you .2 and .20000 first instance demands .1 accuracy and latter .00001.

Something like that...

TEX

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For .2 versus .20000 I kinda agree.

Specifying .2 means that if you round to one decimal place it should round to .2, so .15 <= x < .25

Specifying .20000 means that if you round to five decimal places it should round to .20000, so .199995 <= x < .200005

9. stratofortressTele-Afflicted

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All this math is giving me a headache

10. tubelectronTele-Holic

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Yes. That's what I note. I used and still use both systems. But I must confess that working in metric is much easy for me, because it's "native" (France).

"Metric is precise, Imperial is approximative", if I can say so...

I mean :

15" speakers often doesn't measure exactly 15 * 25.4 = 381.0mm at their external diameter.
(1" = 25.4mm)

There is several types of 3" pipes, depending on their thickness. We find here 76.2x2.0, 2.2, 2.5, 2.7, 3.2, 4, 4.5, 5, 6.3, 7, 8, 10, etc...

A 24"3/4 scale guitar is about 628.65mm lenght.

-tbln

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11. beach bobFriend of Leo's

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I decided to use modern tools, to solve the Imperial units dilemma. I opened up an Excel spreadsheet, and punched in 4/64, to get the decimal equivalent of the fractional inch measurement.

Problem solved!

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Err, you know 4/64 is exactly 0.0625? That 3 hanging out there is a leetle digital fuzz?

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13. beach bobFriend of Leo's

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I guess you never encountered Excel's little calculation error. Supposedly it was fixed some time ago. But I don't know much.

If ya have to explain the joke, it kind of ruins it..

14. uriah1TelefiedGold Supporter

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This was in memes today.
Just saying.

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15. chris m.Poster Extraordinaire

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It always helps to remember the original reason for the Imperial system. The reason was the beauty of the number 12.
It can evenly be divided by 2, 3, 4, and 6. So if something is a foot long it is very easy to divide in half, thirds, or quarters
with no higher math needed. Before there were things like tape measures and calibrated beakers this made it easier to
buy and sell goods, which often requires divvying things up into smaller amounts.

There are a lot of measurements that don't make sense to us anymore- rods, furlongs, etc., etc. But they all made
common sense at the time. For example an acre was about the amount of land that could be plowed in a day:

From Wiki:

Derived from Middle English aker (from Old English aecer) and akin to Latin ager (“field”), the acre had one origin in the typical area that
could be plowed in one day with a yoke of oxen pulling a wooden plow. The Anglo-Saxon acre was defined as a strip of land 1 × 1/10 furlong,
or 40 × 4 rods (660 × 66 feet).

The metric system makes perfect sense, too, of course.

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Unless you want to divide by 10

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17. 41144Tele-Afflicted

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Be interesting to know what the world-wide sales of Fender guitars are to those solely in the USA?
ie ... Rest of the world, to my knowledge, expects/quite happy with SI/metric units anyway?

Personally, buying any new guitar or certainly before setting a guitar up for the 1st time ... I convert any inches measurements to mm as that's what all my tools are in.
I know there'll be nay sayers on that this side of the pond too ... but if you've worked in metric all your life going back to imperial units is just too alien for me.
(And, just to add that touch of frisson here ... i don't feel the need to buy my apples in lbs, petrol in gallons or cables in yards!

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18. chris m.Poster Extraordinaire

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Dividing by 10 is always easy. Just move the decimal over one place. 12/10 is just as easy as 10/10.

As far as Fender measurements go, all I care about is whether I have the right Allen key to adjust the truss rod. Everything else- action height, truss
rod flex, radius of bridge saddles, etc., I measure by eyeball and feel. Don't need a ruler for any of that. I do have a straight edge that sometimes is helpful, but it doesn't need
any actual rulings on it to do the job.

I have to generally agree that in modern times fractions are annoying. I would be perfectly happy to measure everything in decimal terms. I am constantly converting between the two.
For example, in traditional navigation you have degrees/minutes/seconds. 60 seconds in a minute, 60 minutes in a degree. A minute of latitude works out to exactly 1 nautical mile,
which is what a nautical mile comes from. A knot is one nautical mile per hour (around 1.2 statute miles an hour). Anyway, since I work in oceanography I am constantly having to convert
among decimal degrees, degrees with decimal minutes, or degrees and minutes with decimal seconds, or traditional degrees/minutes/seconds to other formats. If you get it wrong or
don't pay attention you can end up making big mistakes, just as when a moon probe augured into the moon. From October 1, 1999:

NASA lost its \$125-million Mars Climate Orbiter because spacecraft engineers failed to convert from English to
metric measurements when exchanging vital data before the craft was launched, space agency officials said Thursday.

A navigation team at the Jet Propulsion Laboratory used the metric system of millimeters and meters in its calculations, while Lockheed Martin Astronautics in Denver,
which designed and built the spacecraft, provided crucial acceleration data in the English system of inches, feet and pounds.

As a result, JPL engineers mistook acceleration readings measured in English units of pound-seconds for a metric measure of force called newton-seconds.

In a sense, the spacecraft was lost in translation.

19. tubelectronTele-Holic

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Well, yes... At least it's not immediate for us in Europe, or not "natural", so to speak. You must have in mind some pre-converted values, even approximative : 1" = 25.4mm, 10" = 254mm, 24" = circa 610mm, 12" = 1ft = 304.5mm, 1m is circa 3.3ft, 10ft is circa 3m, etc.. At least, that's my way to go.

That said, inch fractions are for me the most difficult to apprehend instantly. For example, 59/64" and 15/16" doesn't speak well to me... Conversely 0.921875mm and 0.9375mm are more representative to me.

Let's also say that 24"3/4 and 25"1/2 are a bit more easy to understand by the profane if they are written under the "inch-decimal" way : 24.75" and 25.5".

Guys : just for my curiosity and knowledge, how would you convert exaclty 1mm in inch fraction ? I mean : other than writing 1/25.4" or 0.039370079" ?

-tbln