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Material Layout
In order to create accurate parts, you will have to lay out the material in flat form. First you will
need to determine how much material is used per degree of bend. Use the multiplier table on
Table #3 to determine the arc lengths for the die in use. Or use the following formula:
Alternate arc length formula:
Example:
6.0 clr x2=12 12x3.14=37.699
0.1047x 90 degrees =9.425" of material used for a 90-degree bend.
Once the arc lengths are determined you can begin layout of the material using Diagram #1 as a
reference.
• Diagram #1 shows a simple part bent on the same plane in the same direction.
• Diagram #2 shows bending based off of a centerline in two directions.
• For symmetrical bends, centerline bending is easiest.
• For non-symmetrical bends, continuous one direction bending is best.
• Another way to layout material is to draw them in a 2D computer software program like Auto
Cad. There are many free programs on the internet. In a 2D program you will draw the parts
centerline only with corresponding clr's. Then you will be able to list individual segments of
the bent part. This data can be directly entered into the control.
• Another program available is BEND-TECH which is a program specifically designed for tube
bending and will give you all of the required data to make a part. This software is available
from BAILEIGH INDUSTRIAL HOLDINGS LLC.
• Bending with a rotary draw bender requires determining the start of bend point which will line
up with the "0" mark on the die. The portion of the tube toward the hook arm will be locked to
the die, the portion toward the counter die is the draw side and will slide along the counter
die and conform to the dies shape/radius.
37.699/360=0.1047" per degree
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