Bender Rotation Directions

Positive direction rotations in benders are NOT standardized. It is important to understand how to determine rotation directions to avoid confusion through mirror-imaging.

1. The direction of rotation can be indicated with a CW or CCW direction of rotation from the viewpoint of a viewer at the front of a bender looking toward the rear of the bender.
2. When a bender collet rotates CCW to rotate positive, then it uses the American industry standard, the standard for our VTube software.
   
   

The robotics and engineering community uses a simple right-hand/left-hand rule to designate which way an axis spins positive. For example, this is an image from the BobCAD-CAM site:

In this "right-hand rule" illustration:

1. You are standing in the front of the bending looking toward the back.
2. Hold your right hand up in front of you.
3. Point the thumb of your right hand toward your face.
4. The arrow centerline is the centerline of the tube coming out of the collet.
5. The direction of the curl of the rest of your fingers represents the direction of a positive rotation.
6. Therefore, the right-hand rule shows indicates that positive rotates CCW.

Note that European and Asian benders usually follow the LEFT-HAND rule.