How to make a 90 degree elbow out of sheet metal

Objectives of Problems on Cylinders Cut by Planes. The Scoop. Briefly described, any scoop is a cylinder cut off at an angle. A head is soldered in, and a handle is attached to the head. Figure 72 shows another type of scoop, the body being cut by a curved plane and a cylindrical handle being attached to the head. The elevation should be drawn, using the dimensions given in Fig. It is not necessary to show the handle in the elevation. After the profile.

Extension lines from each division of the profile should be carried through the elevation, Fig. Definition of a Miter Line. The miter line of the scoop is the line of junction between the body of the scoop and an imaginary cutting plane.

how to make a 90 degree elbow out of sheet metal

The line of stretchout is drawn at right angles to the elevation. The spacing of the profile must then be transferred to the line of stretchout and numbered to correspond. The measuring lines are now drawn in. The extension lines from the profile meet the miter line at seven points as shown. From each of the seven points of intersection on the miter line a dotted extension line is carried over into the stretchout. These extension lines must be drawn parallel to the line of stretchout.

Starting from point 1 of the profile, follow the extension line until it meets the miter line, and from there follow the dotted line until it meets lines 1 and 1 of the stretchout. Small circles are placed where the dotted line crosses the measuring lines No. In like manner every point of the profile can be located in its proper position in the stretchout. A curved line drawn through these points will give the miter cut of the pattern. A standard tin lock is added to each side as shown.

Over-all dimensions should be placed on the pattern as shown. It is not necessary to allow for the dish of the head because it is so slight. It should be noticed in drawing Fig. In view of this fact, many draftsmen save time by drawing a half-profile as shown in the elevation of Fig.

This is not an exact pattern, due to the double curvature, but is near enough for practical purposes on small work. By driving the punch and "punching" into the lead piece, a burr is formed on the cap. The Two-piece Elbow. The handle should be cut through at an angle and the two pieces put together so that they will form an angle similar to that shown in the elevation of Fig.

It should be noticed that the cut portions are not circles but that the section is longer in one direction than in the other. The two pieces fit together perfectly to form an elbow. The following facts concerning all elbows are illustrated in Fig. They should be memorized by the student. The Base Line. This line is called the base line of the elbow. Arcs of the Elbow.

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These arcs have the same center. Center of the Elbow. Throat of the Elbow.By learning how to bend a 90 first you will be better prepared when you start learning how to bend offsets, parallel offsets, and saddles. Take up is a amount of conduit length used to figure out where to place the marks on the conduit before the bend.

Most hand benders have the take up stamped on the bender or on a sticker — usually on the bender handle. Find this first. STUB — A stub is the length you need for the conduit to reach and is measured from the back of the bend or backside of the conduit.

This is to allow for spring back. Check out this very informative video on how to bend a 90 degree with EMT.

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Conduit comes in 10 foot lengths and can create an awkward bending situation when the stub length is over 60 inches. The reverse method for bending a 90 is an alternative that addresses this type of situation. This method is also used in back to back 90 degree bends. When using the reverse method the take up deduction is no longer needed. A back to back bend is making a U with the conduit.

To do it right, you could use both the basic and reverse method depending on the lengths of the stub you need. The video below shows you the proper way to make a back to back He uses 30 inches between bends which allows for plenty of clearance for the handle and bender show.

EAHQ is working on our own videos and will post them when completed.

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If you have something to add, please leave a comment below. Share Facebook Twitter Pinterest. It may vary between bender manufacturers.

Website designed with screwdrivers, levels, hammers, and keyboards.As I mentioned in my last post you need to do some tests to calculate these values for a specific sheet.

These tests include bending some samples and then do some measurements and calculations. Consider a sheet with a 20 mm thickness and a length of mm as shown in Figure 1. We are going to review three bending scenarios with three different bending angles; 60, 90 andand we will calculate K-Factor, Bend Allowance and Bend Deduction for them.

The bending tool has a radius of 30 mm which means that our Inside Bend Radius R is 30 mm. We will start by calculating the Bend Allowance.

Is there any way to create a 90 degree square elbow sheet metal transition?

From there we can calculate the K-Factor and the Bend Deduction. After bending the sheet we need to do some measurements as shown in Figure 2. In this formula the initial length is mm. By replacing Initial Length, Leg Length 1 and 2 in the above equation we can calculate the Bend Allowance as follows:.

We know that BA is the length of the arc on the neutral axis. The length of the arc for this scenario can be calculated as:. By inserting the Bend Allowance value in the above equation we reach to:. For our second scenario we are going to discuss the calculations for bending angles less than 90 degrees. As an example we are going to use 60 degrees as our bending angle.

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Again we have to do some measurements as shown in Figure 3. Then we have to calculate Leg Length 1 and Leg Length 2. Where R is the Inside bend radius which is equal to 30 mm in this example.

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We can calculate Leg Length 1 through a few simple equations as follow:. Now that we have both Leg Length 1 and 2 we can use the following equation again to calculate the Bend Allowance:. Where OSSB is the outside setback. OSSB is defined as illustrated in figure 5 for different bending angles and can be calculated using the equation below:.

Where A is the bending angle,T is the sheet thickness and R is the bending radius. Figure 5: outside setback OSSB in different bending angles. Figure 1: Flat sheet.View Full Version : calculate duct length between to 45 degree elbows. Is there a formula to figure out the the lenght of duct to fit between the 45 degree elbows. I know i can lay this on the floor and calculate the duct in between the 45's I tried something different but i got the same results.

Since i knew my pattern was 48" and my offset was 36" and my real throat radius was only 12" This is what i did and it worked. I'm sorry, i used the same example This is what i did Only problem is i have to actually layout the pattern to get this formula. That's kinda hard to follow but if your Cl rise is That's going to put you about 1. When your laying out angels your splitting hairs to stay in the ballpark. Go back and work the formula that tinmetal posted and you can't go wrong. Bro, ur wrong Btw, thanks to tinmetal for the help It's pretty basic, i have a side 45 degree elbow and i was trying to create a 36" offset And the pattern size of the elbow was 48" and my throat radius was 12".

Tinmetal was right, the only thing i didn't give him was my throat radius but that number can be any Number and his formula always works.

Well, like I said it was hard to follow. Glad you got it.

how to make a 90 degree elbow out of sheet metal

But if your center line rise was Didn't mean to confuse. Again thank-you for this formula, you've made it very clear.In I use to work at the Sheet Metal Shop where we made all the ducts and fittings almost exclusively by hands! Yes we had a hydraulic guillotine shear, sheet metal brakes, slip roll machine, hand-tools and this about it. Nevertheless we were able to make all kinds of rectangular and round ducts and all types of fittings.

Inalmost 30 years later, I decided to share my skills with all of you. Every weekend I was making one of the fittings below, taking pictures and writing tutorials. All the pictures are set in the step-by-step sequence with brief explanations that would allow you to make any fitting in the matter of minutes.

Every tutorial is available separately, so you can purchase an instant access to any of them or you can save and purchase an instant access to them all.

Register on the site first recommendedotherwise after you have purchased a paid page; PayPal is going to bring you back to my website. Important: After you have purchased any Paid page or Download page and PayPal brought you back to my website, the first thing that you should do is to save that page to your Favorites.

Then if something goes wrong you always can come back to re-register yourself on my website again. How to Make Round to Square Transition. How to Make Riser Starting Transition. How to Make Centralized Hess Fitting.

How to Make 24 x 10 to 10 x 24 Duct Transition. How to Make Transition from Whole Duct. Do you want to know how to make a square to round offset transition just like a sheet metal guy would do? Do you want to know how to make it in a matter of minutes?

Recently, and I'm not kidding, I've received this question below: "how big of whole needed fo 10 inch pipe through 45 degree angle" - well of course it wasn't a direct question, but it was a "keyword" someone was using to find my site on the web. In my more than 30 years in the ductwork installation business I've never tried to find an answer to this question, so I looked on the web And guess what it is there!

I am about to install a woodstove. The flue goes straight up thru a cathedral ceiling that is The pipe that penetrates the ceiling is approx. Selkirk Metalbestos sells a woefully inadequate one-size-fits-all two-piece trim kit that does not provide a tight fit Anyway, my question is about laying out the correct cutout given the OD of the pipe and the 45 degree angle of the lid.

If I can make the layout on paper I can get my friendly local tin man to make a decent looking piece of out heavy galvanized sheet. An alternative is to send it to the friendly non-local tin men who have a CNC cutout machine, it would take them just a few seconds.

So, if you'd find this thread on that website you'd actually learn how this question was answered, but here is another question - would you understand the answers? I'm sorry but even with my master degree in the mechanical engineering I didn't. Furthermore, would an ordinary tin knocker with pretty much forgotten high school diploma ever understand it - sorry guys, but I do not think so!

So I decided to think about it for a moment and find a solution any ordinary tin knocker would understand - no math, no bull If you would like to read more please click on the Buy Now button below.

how to make a 90 degree elbow out of sheet metal

If you would search the web for the tutorial in the title above you may find this video file:.Anyone know any tricks of the trade or methods to properly wrap a sheet metal elbow with fiberglass insulation and tape so it looks really The sections of an adjustable elbow are called "gores", so to neatly wrap the elbow first determine the proper circumference of the insulation, then make a pattern tracing the gore sections onto paper, and using these gore patterns to cut out the insulation.

When the elbow is completely wrapped, then tape the seams going around the gores. The cut length for 1" insulation around a 6" elbow will be around 22". Try before cutting. Use a good grade of duct tape to seal the seams. Wrap the insulation around the pipe so you have a tube.

Pipe with 90 degree elbow made of sheet metal

Mark it so you can remake it after removing it from the pipe. Cut it on a 45 degree angle and then use the two pieces to form the elbow on the pipe. One piece on the horizontal pipe and one on the vertical pipe.

The cut should make a 90 degree angle. LOFT Lv 5. Answer Save. Favorite Answer. Still have questions? Get your answers by asking now.Powered by mwForum 2. Not logged in American Welding Society Forum. By mark j guzma Date I need to layout a four piece 90 degree elbow26 inches in diameter by one quarter inch thick mild steel.

Pipe with 90 degree elbow made of sheet metal

Or con you buy templateswould a contour marking tool work.? By LarryL Date A CAD design consultant with expertise in a program such as SolidWorks will be able to produce cutting templates for you. SolidWorks has a versatile sheet metal design component. The same concept would go for the gores of a fabricated plate elbow.

Instead of making a template you could transfer the individual line lengths to the pipe after dividing it into sections. Hope this helps a little GA.

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This method is the old, original one for creating layout patterns. I was taught it years ago in an engineering drafting course.

It requires very accurate dimensioning from datum planes. Extrapolation from the small scale drawing on a drafting board to a large diameter pipe size, therefore, may result in significant dimensional errors.

Also, with the everyday use of computers in drafting, it may be difficult to find a draftsman or engineer who is familiar with this manual method.

Nowadays, an appropriate CAD program can turn out extremely accurate cutting templates in a fraction of the time required by this manual method. I agree that certain technology would help. The availability of equipment to do this is a variable. As would a CNC burning machine. The ordinate lines for the pattern can also be calculated I'm sure but I don't know how. A soapstone, string, and tape measure may not be as precise or as easy but they are available. A 3rd party detailing company would be a way to go provided thay are not too proud of their technology.

Have a nice day Gerald Austin. By GRoberts Date I has worked very well for us. By jwright Date Ours are printed on 30 x 42 paper and if it is still too big, we cut and tape as GRoberts said they do. Oh, ours were created in XSteel by our sub-let detailer. John Wright. By CHGuilford Date Just another suggestion-- Unless you really want to layout and cut the pieces yourself, you might try to purchase the pieces pre-shaped so all you have to do is roll and weld.

Many suppliers use burn table programs that cut any shape you want. We use SDS software with our plasma table, which allows us to enter the dimensions, number of gores, weld joint requirements, and etc.


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