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  #1  
Old 02-15-2011, 05:57 AM
johnjohn84 johnjohn84 is offline
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Default Math Formulas

I have just started in the Sheet Metal Trade and my company does tenant work. We use a lot of rectangular duct and lots of pipe. My background is in electrical so this trade is a big jump. I have learned the O.W.L. formula and I was wondering if there were more formula like the owl. Most of the men in my company say not to waste my time but I think it's better to ask then not to. I appreciate any and all input.
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Old 02-15-2011, 05:27 PM
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Quote:
Originally Posted by johnjohn84 View Post
I have just started in the Sheet Metal Trade and my company does tenant work. We use a lot of rectangular duct and lots of pipe. My background is in electrical so this trade is a big jump. I have learned the O.W.L. formula and I was wondering if there were more formula like the owl. Most of the men in my company say not to waste my time but I think it's better to ask then not to. I appreciate any and all input.
Welcome to the site.
If you're going to do any fabricating, learning triangulation is your first priority.

http://en.wikipedia.org/wiki/Pythagorean_theorem
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Old 02-26-2011, 06:34 PM
johnjohn84 johnjohn84 is offline
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If I was to do any fabricating it would be cutting down rectangular duct to make fittings on the site. Was wondering if any one could recommend a good book or site to help me get familiarized with different fittings.
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Old 02-26-2011, 07:53 PM
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There are a lot of books in the library here. Also I can give you some book titles if you need them.

As for the best site, you're already here

Thanks for joining us!
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Old 04-08-2011, 07:57 PM
Apprentice Apprentice is offline
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Welcome to the site, and more importantly......Welcome to the trade!
I don't want to scare you away but as for formula's our trade uses, well you might wanna sit down grab a pen & paper and read some of the guys posts on this site. They will teach you alot.
Currently I'm in my final term of Trade school and in this level (Advanced) I have aquired the knowlage of at least 12 new formulas for many things including sizing motor pulleys, Velocity, CFM conversions, heatloss, static pressure and many more.
My best avice to you is take the time and get into trade school. It has helped me, and now I'm looking to wrte my licence within the next month.

until then here is a few formula's for you to investigte:

1) BTUH = CFM x 1.08 x TD

2) BTUH
------- = CFM
TD x 1.14

Maybe if you find out what these mean (do a little investigating) and find it interesting, I can post a couple questions and teach you what is going on.
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Old 04-08-2011, 08:48 PM
Dan Piazza Dan Piazza is offline
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Here's one:

A of D = H of Mt : Ma of A

Angle of the Dangle equals the Heat of the Meat which is in direct proportion to the Mass of the Ass (Donkey).

Just a joke.
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Old 04-09-2011, 05:12 PM
johnjohn84 johnjohn84 is offline
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Default I would love to learn

I would love to be taught and thank you for taking the time to offer. Most of the guys in my company don't really have most of the answers that I'm looking for. You were talking about static pressure in your post. What is that about? I have the basic understanding that you shouldn't cut your air tights to close to the end of the duct, but why should there be static pressure? What is it used for and why does it need to be calculated. thanks again for helping me to learn everyone.
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Old 04-09-2011, 08:40 PM
Apprentice Apprentice is offline
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If you Email me I can send you some reading Material on Static Pressure.
Pm me for m Email
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Old 04-16-2011, 08:42 AM
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I just Emailed you back with some info, but it keeps coming back with a "Mail Status Delivery Failure". I will try again in a couple days.
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Old 04-22-2011, 06:06 PM
smwlocal24 smwlocal24 is offline
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It is better to learn math in general as opposed to particular formulas for specific tasks. By learning the math behind the formulas first, you will be able to develop your own formulas and understand why others work out the way they do. When I first got into the trade I felt the same way as you do now; I wanted formulas but no one knew any except for OWL and Pythagorean. You should take college math courses at your local community college in algebra and trigonometry and eventually maybe calculus. You need algebra to use trig, and you can use trig every day. Calculus isn't needed for sheet metal work, but it will help make you more solid with the algebra and trig. All sheet metal layout is comprised of many geometric shapes which can all be modeled and defined by mathematics.
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