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 Home Model Engine Machinist > Trying out metric

12-22-2009, 05:16 AM   #21
rake60

Join Date: Jul 2007
Posts: 4,769
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Re: Trying out metric

Prints may be drawn with metric, imperial, or some measurement based on the
width of the current King of Mars thumbnail or how far a common garden slug
can travel in 15 seconds. It doesn't change a thing when it comes time to
cut the metal. In any language a size is a size. You will either hit the size
or miss it. If you miss it make the mating piece to fit. It really doesn't matter
what the numbers on the paper are. They might me millimeters, they might be
1/16ths of an inch. If it fits together in the end and works, it is a successful
machining operation.

If you will excuse me now I need to go and recalibrate my adjustable Crescent
Wrench. It is Imperial of course and I need it to work on my Suzuki Tracker
tomorrow. Converting it to metric may keep me up all night!

Rick

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Seriously, how many times can THAT happen in one day?

12-22-2009, 07:35 AM   #22
Davo J

Join Date: Aug 2008
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Re: Trying out metric

An easy way to get used to metric coming from imperial is to buy a metric/imperial tape, then you can easily convert from one to the other untill you get used to it.
Dave

12-22-2009, 11:38 AM   #23
ToniTD1490

Join Date: Feb 2009
Posts: 31
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Re: Trying out metric

From http://www.kanabco.com/vms/library.html

“There are two systems of measurement used in machine shops today, the Metric system and the Inch system.
The Metric system is based on the meter as the standard unit of reference. A meter (approximately 39.37 inches in length) is subdivided into 10 equal parts called decimeters. Each decimeter is divided into 10 parts called centimeters and each centimeter is divided into 10 parts called millimeters.
The Metric system is a very coherent system because it is exclusively a decimal system and therefore has a common multiplier and divisor of 10. Regular fractions are not used in the metric system. Instead the metric system uses only decimal fractions. Other names for the Metric system include SI units and ISO units. The Metric system is the most commonly used system of measurement in the world.
The Inch system is based on the foot as the standard unit of reference. A foot is divided into 12 equal parts called inches. Each inch is subdivided into a variety of fractions and decimals.
The Inch System is a rather incoherent system because it lacks the decimal based advantage of the Metric System. Parts of a foot can not be easily expressed as decimal inches. For example, in the metric system 7 millimeters is 0.7 centimeters which is 0.07 decimeters which is 0.007 meters. But 7 inches is 0.583333 feet which is 0.19444 yards and so on. This is a clear advantage for the metric system.
Another name for the Inch System is the English System. The Inch System is used in most English speaking countries but is being slowly replaced by the metric system.” I like Metric, because I learnt with the Metric System, but other people like Imperial.

Regards,
ToniTD1490
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Murcia -Spain "Huerta de Europa"

12-22-2009, 11:46 AM   #24
tel

Join Date: Feb 2008
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Re: Trying out metric

The beauty of the metric system is that it's just so darned logical (to paraphrase Samuel Clemens, speaking of the Ethan Allen pepperbox) one litre, is defined as a cube 100mm on all sides, and, by co-incidence, weights 1 kilogram
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Tel

I come from Australia
That's my native land
Where a bird in the bush
Is worth two in the hand

12-22-2009, 12:04 PM   #25
ToniTD1490

Join Date: Feb 2009
Posts: 31
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Re: Trying out metric

In 1901 liter was described as the volume occupied by a mass of 1 kg of pure water in its maximum density and to normal pressure (to 4 °C and 1 atm respectively). This definition was repealed in 1964 because the liter was differing from the cubic decimeter in approximately 28 parts for million, inducing to mistake in the measurements that need enough precision. Nowadays only It is used as a special name of the cubic decimeter.
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Murcia -Spain "Huerta de Europa"

12-22-2009, 12:10 PM   #26
tel

Join Date: Feb 2008
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Re: Trying out metric

Hmm .... it's close enough for me, at any rate.
__________________
Tel

I come from Australia
That's my native land
Where a bird in the bush
Is worth two in the hand

12-22-2009, 12:29 PM   #27
Maryak

Join Date: Sep 2008
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Re: Trying out metric

Quote:
 Originally Posted by mklotz Do you still use that hundredweight (cwt) that weighs 112 pounds?
LENGTH

4 inches = 1 hand
12 inches = 1 foot
3 ft = 1 yard
5.5 yds = 1 rod pole or perch
4 poles = 1 chain
10 chains = 1 furlong
8 furlongs = 1 mile

WEIGHT

16 drams = 1 oz
16 ozs = 1 lb
14 lb = 1 stone
28 lbs = 1 qtr
4 qtrs = 1 cwt
20 cwt = 1 ton (long)

VOLUME

4 gills = 1 pint
2 pints = 1 quart
4 quarts = 1 gall (imp)
2 galls = 1 peck
4 pecks = 1 bushel
8 bushels = 1 qtr

These and many other wonderous ways of measuring things are all part of the rich tapestry of British ancestry.

Best Regards
Bob

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Its hard to remember your objective was to drain the swamp when your up to your neck in alligators.Если вы у Тетушки были яйца, она была бы Дядюшкой

12-22-2009, 12:39 PM   #28
tel

Join Date: Feb 2008
Posts: 3,303
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Re: Trying out metric

Yep, what's difficult about that? But you left out Rods and Perchs and other associated seafood Bob!
__________________
Tel

I come from Australia
That's my native land
Where a bird in the bush
Is worth two in the hand

12-22-2009, 12:50 PM   #29
Maryak

Join Date: Sep 2008
Posts: 5,001
Liked 140 Times on 125 Posts
Likes Given: 1

Re: Trying out metric

Quote:
 Originally Posted by tel Yep, what's difficult about that? But you left out Rods and Perchs and other associated seafood Bob!
The pole = the rod, both of which equal a perch, (if your very patient and very lucky whilst dangling your rod or pole in the canal with a maggot and a bent pin on a piece of string).

Best Regards
Bob
__________________
Its hard to remember your objective was to drain the swamp when your up to your neck in alligators.Если вы у Тетушки были яйца, она была бы Дядюшкой

12-22-2009, 03:52 PM   #30
dieselpilot

Join Date: Jan 2009
Location: Chicagoland
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Re: Trying out metric

Quote:
 Originally Posted by rake60 If you will excuse me now I need to go and recalibrate my adjustable Crescent Wrench. It is Imperial of course and I need it to work on my Suzuki Tracker tomorrow. Converting it to metric may keep me up all night! Rick
You must have an old one. That standard went out a while ago. My craftsman adjustable wrench is both metric and imperial. I'm not kidding.

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