Find your Radius

A radius of a circle is the length of a line from the center of a circle to its perimeter. When measuring a curved bend you can measure from the inside of the bend or outside to yield the inside or outside radius respectively. From that, you can deduce your true center-line radius. This is what a bend radius looks like: For trueCABLE U/UTP solid copper unshielded cable, we follow the ANSI/TIA guidelines. The inside radius of bends should be no tighter than 4X the outer diameter (OD) of the cable. For trueCABLE F/UTP solid copper shielded cable the inside radius of the cable should not be tighter than 7X the OD of the cable.

This is more clear if you look at the image below. The CLR is expressed as a what to do in monterey bay ca multiplied by the pipe or tube ro.

In fact, taking this measurement from anywhere on the elbow will give you the Howw. The centerline radius is only one measurement on your elbow. You may also need to know the degree, line size, and tangential points in order to measure your elbow. Watch our video on how to measure a pneumatic conveying elbow for everything you need to know:.

The reason you need to know your centerline radius is so that you know the space your new elbow needs to fit into - a inch centerline is a lot smaller than a inch CL, for example. Other than the line size and making sure that you have the right degree, there are only two variables that affect the size of an elbow: one is the CLR and the other is the length of the tangent, or the straight part *how to find the radius of a bend* the elbow that comes off the curve.

Fnid us today to find the right solution for you. Tube and Pipe Bending Basics. About Us. Fabrication Fhe Machine Services. What is a Centerline Radius and How is it Measured?

How to measure your Centerline Radius

The radius is produced as a percentage of the die opening, regardless of the die style. If you are working with a material thickness of in., multiply that by to get a minimum inside bend radius of in. For this material, this is the minimum producible inside radius with air forming. Measure the circumference of the pipe bend with a tape measure. Do this by pressing the tape against the inner surface of the pipe. Then run the tape from the point where the bend begins on one straight end of the pipe, to the point where the bend ends on the other side of . Radius Bend (Duct) Revision , August Measuring and Sketching Measuring – Finding the Radius of a Rectangular Duct Bend When finding the throat radius of a radius bend we can use a number of methods such as: Use a flat steel square as shown and take the measurements from theFile Size: KB.

Figure 1 If you know the included bend angle and the die width, you can calculate the inside radius and length of the arc at a specific depth of penetration Dp , using your graphic calculator or online calculators like www. The results give you a starting point for incorporating real-world bending variables such as material type, thickness, springback, and the parabola effect.

Q: I have really taken the theory behind your articles to heart, and I have done my best to apply it to the greatest extent I can. Of course, many of these have ranges of values to use. Are there ways to calculate bends more precisely for various angles and radii? This is the smallest radius you can bend in a part before the punch nose starts creasing the material.

For 60,PSI cold-rolled steel, this occurs when the radius is about 63 percent of the material thickness. However, various factors come into play for different materials, thicknesses, and punch nose radii.

During air forming the inside radius forms in proportion to the die width. This is true of all air forms, regardless of the style of tooling you are using. This is the essence of the 20 percent rule. Then again, a good technician can work the information either way. The percentages in the 20 percent rule are based on material tensile strength. For our baseline material, 60,PSI cold-rolled steel, the radius forms as 16 percent of the die width.

So, to apply the rule to other materials, we calculate the following:. This simple calculation works well in the shop environment, but of course there are plenty of other variables that affect the radius, including the bend angle. To calculate the radius produced at different bend angles, first find the radius and length of the arc of the bend, and then manipulate these results to factor in tensile and yield strength.

When calculating the radius and arc length, a graphic calculator or websites like www. On handymath. If you know the die width and the included bend angle, this online tool will calculate the length of the arc, the depth of penetration, and the inside radius see Figure 1. Figure 2 When bending sheet metal in a press brake, you actually form a parabola, a conical shape, not a single radius. This affects the bend functions, and for profound-radius bends, the parabola effect can be dramatic.

Consider an application involving 0. Using the online calculator, we get the length of the arc; to find the inside radius, we multiply the length of the arc by the material thickness.

For more about the math behind these calculations, see Math Behind the Arc Radius and Length sidebar. If the angle relaxes, so does the radius. Imagine a circle drawn so its curved surface conforms to the bend shape.

As the bend angle gets wider, the circle needs to get larger to conform to the bend shape; a larger circle, of course, has a larger radius. This is how we measure the inside bend radius in precision sheet metal fabrication. It goes back to the nature of bending sheet metal. As the punch pushes the material into the die space, it does not always form a simple radius. It in fact creates a parabola, a conical shape see Figure 2. Because you actually form a parabola, the radius does not remain consistent through the bend angle.

This parabola affects various bend functions, and the effect on profound-radius bends is great. We have so many variables to deal with. Nonetheless, we can get extremely close if we try. Next month—even closer! Bending at its core is about geometry. To calculate the length of the arc in a bend, you probably will rely on a website such as www.

But if you want to know the math behind it all, refer to the boxed equation in the figure. A is the depth of penetration Dp , B is half the die width Dw , and R is the radius.

The curved red line represents the bend. Note that this is pure geometry, and the resulting radius does not incorporate the conditions of real-world bending.

But it does give you a figure you can work with to factor in variables like material thickness, material type, and springback. Consider the following application using a die width of 0. Penetration from the pinch point to the bottom of the stroke Dp is 0. Salem, OR Email Steve Benson. Read more from this issue.

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