Hi guys,

I don't know how to convert "thou" to "mm"!! I need it for thermal growth calculation!! Why people need so many different units,ryt?

Have a nice day!!
Original Post

I'm going to try to attach a conversion program that someone gave me years ago. It has a "custom" heading for special stuff.

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1 inch = 25.4mm

1 thou = 0.001" = 0.0254 mm

Unless I'm mistaken, Ron's conversion is off by a decimal place.
1" = 25.4 mm So, .001" = .0254 mm

Multiply thou or mils=.001" by .0254 to get mm

Alternatively, 0.03937"=1mm 39 mils to the mm

I should have refreshed to see E'Pete's. Also, it is common to use the 1/100's mm dials - 2.54 of those are in a mil if you think English units.
.001" = .00254cm = .0254mm yep, I divided by 10 instead of multiply. Thanks.
As "the" Charlie Jackson once said years ago "We are changing to metric, just doing it inch by inch."
Charlie also knew that if God had meant for us to be metric there would have been 10 disciples.
Bill, you're not being politically correct!
Ah.. the British unit system!! How many billions of person-hours have been wasted over the years on conversion of them from one to the other.
Once saw an article illustrating how ridiculaous it all is. About a freighter transporting grain and other cargo on the Great Lakes....
Ship weight was referred to as displacement in tons.
Power in horsepower, thrust in pounds.
Depth of water in fathoms, and ship's speed in knots (or was it furlongs per fortnight?).
Grain cargo was in bushels, and they also transported a few horses whose weight was in stones, and height in hands.
And on it went...
Yards are not bad, but if they did golf courses in chains and rods, how would we know what club to hit?
All good practical units in their day, based upon feet-on-the-ground human activities, but for science and engineering...Uh Uh Don't think so.
Metric anybody?
And then there are US gallons, which are different to UK (imperial) gallons, US ounces which are different to UK onces, and the list goes on. Give me metric anyday (everything divides by ten)
Driving alongside a railroad track the other day, I was telling my daughter how the width or gauge of the track is actually determined by the width of horses' butts thousands of years ago.....
The British are comming, the British are comming. What was it? One if by land two if by sea. I always thought learning the metric system was easy but for the life of me I cannot think in metrics. Well, maybe I can, I do know how big a liter is, it is a little bigger than a fifth.

Ronnie
Hi guys,

Thanks for all your response!! I'm a new generation guy and i'm used to SI units only. Ha ha ha... If someone say i have to measure 1 feet, i will first convert it to "cm" in mind. I agree with Ron!!! Lot of man-hours are wasting here for these conversions!!

Anyway thanks again!!

Have a nice day!!
SI? So, the balance weights are in kg-m; must be big machines or tiny weights in these units. How many Pascals is that at sea level? It's got to be greater than 15.

What really kills me is to see pressure gauges in kg/cm^2. What type of unit is this? Recently, I've seen some kgf - force. If units like these are used, go to the US customary units.

One of the best balance units is g-in, my personal favorite. I guess if you had to you could multiply this by two and a half and call it g-cm, but this is not SI.
Then there is the Poncelet (French measure of horsepower)or the PferdestΓ€rke (German, literally "horse strength" often referred to as DIN horsepower.

John
Do you use the 'metric' paper size?

ISO 216 defines the A series of paper sizes based on these simple principles:

The height divided by the width of all formats is the square root of two (1.4142).
Format A0 has an area of one square meter.
Format A1 is A0 cut into two equal pieces. In other words, the height of A1 is the width of A0 and the width of A1 is half the height of A0.
All smaller A series formats are defined in the same way. If you cut format An parallel to its shorter side into two equal pieces of paper, these will have format A(n+1).
The standardized height and width of the paper formats is a rounded number of millimeters.

A4 is 210 X 297. Isn't that lovely? 8 1/2 X 11 looks nicer, too.

The Japanese JIS P 0138-61 standard defines the same A series as ISO 216, but a slightly different B series of paper sizes, sometimes called the JIS B or JB series. JIS B0 has an area of 1.5 mΓΒ², such that the area of JIS B pages is the arithmetic mean of the area of the A series pages with the same and the next higher number, and not as in the ISO B series the geometric mean. For example, JB3 is 364 Γβ 515, JB4 is 257 Γβ 364, and JB5 is 182 Γβ 257 mm. Using the JIS B series should be avoided. It introduces additional magnification factors and is not an international standard.

This all makes perfect sense to me!
A fortnight ago I weighted 12 stones; OK, 15.
One more thing; we use automatic lubers from a Canadian company. Thier stuff is in cc's which is a volumetric measure but we're shoving out grease through them. Now this makes us calculate the real quantity of grease needed and convert that to grams w/SGr a part of the process.
HI, like Jennish I'm an SI (generation X0)
What I can't understand my american friends is why your gallon has to be different than the english gallon. And another thing - please drive on the Left side of the road from now on like the rest of us!
Hi Bill,

What i mean is, too many units is always bringing trouble. So itz better to stop using the old system of units and accept the "System International"!! Ha ha ha...

Actually in old days when people are not much interactive like this, they used their own local units for measurements. But now the communiction b/w people is bringing the world as a single community and they need Standard units which can be understood by everyone.

Have a nice day!!
A true story: new apprentice in class. Instructor asked, "how many 8th are there in an inch". Student said, I don't know. The instructor said, count them. Student counts and says 8. Then asks, how may 16th are there in an inch. Student; I don't know - instructor - count them! So he counts 16. Then the instructor as how many 32nds, again the student says, he_l, I don't know and back to counting and comes up with 32. You guessed it; how many 64ths are there - the student said - there must be a thousand of 'em!!!!!!!!!!!!!!!!!!!!!!!! Broke-up the whole class; break-time.
Jenish, I agree; everyone should speak English.
I've been trying to convert to the metric system inch-by-inch for years with little success.

John J
quote:
Originally posted by Sam Pickens:
Jenish, I agree; everyone should speak English.

Well Sam, things seem to be going that way. Just read a few days ago that before long there will be more English speakers in China than in all the rest of the world combined.
When I left this morning the temperature was about 10 degrees C. When I arrived the temperature was 98 degrees F. It is clear one is warm and one is cold.

Everything was metric in Can-eh-da. Almost, anyway, the engine test measured how many horses was in the engine, and the temperature yesterday afternoon in the test cell was 51 degrees F. I guess they haven't completely converted.

The units were unusual for the younger people. At least they still use 8 1/2 X 11 paper.

Part of the mystique of being an engineer is to understand the units. It makes people think one is valuable.
I like my metric/english tape measure. I find it a lot easier to read it in millimeters and then cross to the other side of the tape and convert it to inches. Heresy!, I know, but there is none of that is it 13/16th or 3/4. Millimeters is easy to read!