What if your making a 90 degree bend on12 inch conduit bender has 5 take up and you need 13 rise how far from the starting point would place mark?

To calculate the location of the mark for a 90-degree bend on a 12-inch conduit bender with 5 take-ups and a 13-rise, you can follow these steps:

1. Determine the Take-Up (TU) value: The take-up value represents the amount of material that is used up in the bending process. For a 90-degree bend, the TU is equal to 0.5 inches multiplied by the number of conduit sizes (CS). In this case, the conduit size is 12 inches, so TU = 0.5 x 12 = 6 inches.

2. Calculate the Center Line Radius (CLR): The CLR is the distance from the center of the conduit to the center of the bend. It is equal to the rise divided by the sine of half the bend angle. For a 90-degree bend, the sine of half the angle is equal to 1. Therefore, CLR = Rise/sin(Bend Angle/2) = 13/sin(90/2) = 13 inches.

3. Determine the Starting Point: The starting point is the location where you begin bending the conduit. It is typically located at the end of the conduit that will be inserted into the fitting.

4. Calculate the Mark Location: To find the mark location, subtract the take-up value (TU) from the center line radius (CLR). This will give you the distance from the starting point to the mark. Mark Location= CLR - TU = 13 - 6 = 7 inches.

Therefore, the mark should be placed 7 inches from the starting point on the conduit to achieve a 90-degree bend with a 13-rise using a 12-inch conduit bender with 5 take-ups.