Calculation of Tonnage

if your press has an area of 1000 square inches and you want to apply a uniform 100 PSI acroos that area =100,000 pounds force = 50 tons, and so forth.

Some are mechanical, but most are now hydraulic and if the area of the hydraulc ram is 25 square inches you will need an oil pressure of 100,000/25 = 4000 PSI for a direct ram. Often they use a wedge or other form of mechanical advantage to reduce the ram are or line pressure.

http://www.google.ca/search?hl=en&q=%22hydraulic+press%22+%2B%22design+considerations%22&btnG=Google+Search

Why would you want to calculate tonnage? If you use SI units force is measured in Newtons and pressure in Pascals (Newtons/square metre) so why would you want to calculate the mass of the press?

I can really be a sarcastic sod some times, can't I?

Yes, I figured he was a pounder and a rounder, so I suited his terms.

dear sir,

thax sir ur replying my question. bcz this question will ask a interwiver while in interviwe .and also our maintainance engineers are also ask this queston for me and they told if u find the answer and tell me

This could be a candidate for the infamous "Questioner's Hall of Fame", or was it "Wall of Shame"?

But why stop guessing now?

The answer you seek is that the tonnage of the 200tonnn press is 200tonnns and for the 300tonn press is 300tonns ( Do not confuse tonnn and tonn). <----- IT'S A JOKE (gotta be real careful here)

On the other hand, if you meant "how many tons is a 200 tonne press rated at then you merely convert a metric ton (or tonne) to a ton in which case the answer is 220 tons and the 300 tonne press converts to a 330 ton press.

Yes I know I rounded one and truncated the second and I am well aware of the SI / English unit conversions, but we all understand the context and this is the answer called for in this interpretation.

The formula would be:

To convert tonnes to tons, multiply by 1.1023

Best Wishes for the New Year!

1 tonne = 1.1203 tons For the USA only

Use that conversion factor outside the USA and your press will not work.

1 ton = 1.01633 tonns For the rest of the world.

Note the USA uses a 2000 lb ton where the English ton is 2240 lb which just reinforces my point that it better to stick with SI units even if you do live in one of the two countries that don't use the metric system.

By the way it's just past midnight in Sydney so let me be the first to wish all a happy new year.

FYI:

2000 pounds are also called a short or U.S. ton

2240 pounds are also called a long or Empire ton

I hate the CGS system, I prefer the FFF system (furlong-firkin-fortnight).

Conversions are far simpler

I tried your suggestion but it F_'d up my calculator!

Happy New Year!

I've been more prone to use the FSF system (Furlong-Stone-Fortnight). What is the conversion for firkin to stone?

Thanks to you and those who corrected me and reminded me of the Long Ton/English Ton etc

I was too caught up in the mass/force aspect, the wording of the question, and my own U.S. centric career experience.

I had never come across the long ton in that context. Is the long ton still in widespread use in relation to press ratings?

This brings up another question I have, and that is the meaning of the word "billion". We in the U.S. have always used it for one thousand million (10^9) but I know that it can (or did) also mean a million million (10^12) in England and some other places. Is that still so? If yes, then what would a trillion mean?

Best Wishes for the New Year to all!

Being an old sod from the old sod, I am familiar with the US billion of 10^9 and the UK one of 10^12 and recall the UK press using the term of 1000 million for the US billion in the papers of the day. But I left the UK in 1948 and the older UK terms seems to be fading

I do not know the etymology of the terms,

http://en.wikipedia.org/wiki/Billion

Sorry billion is out, you shouldn't use it any more the correct term is giga. If people write terms like $50K then they should be using $5G instead of $5B.

Not to be confused with $5G's : being American slang for $5000 (G = Grand = 1000).

I like the Giga prefix, but never heard it used with money yet.

For calulation of Tonnage first we have to check either the press is mechanical, pneumatic or Hydraulic.As for mechanical and pneumatic presses we have to take factor of Impact load too which is usually double the force produced by the ram.For calculation of laod use formula F= PA.

Naveen Sharma

Ahh you guys, my press gauge reads pounds per sq inch, I let the ram convert this to whatever tons,tonnes or kilograms it likes, its never complained.

HI

TO CALCULATE THE SIZE OF THE PRESS - YOU NEED TO KNOW

THE THICKNESS OF THE MATERIAL TO BE CUT

THE CROSS SECTIONAL AREA TO BE CUT

AND ALSO THE SHEARING STRENGTH OF THE MATERIAL.

MOSTLY THE TENSILE OF THE MATERIALCONSIDERED .

BASED ON IT TI NEED TO FIND THE SIZE OF THE PRESS

V.MURALIDHARAN

A good answer, but to the wrong question.

No one said it was a cutting press, and the question wasn't to determine the size of a press needed for a particular task, but rather how to convert the ratings of existing presses to a different unit system.

Happy New Year!