The Importance of Understanding CNC Bender Rotation Directions
The "positive" direction for collet rotations in benders is NOT standardized for benders. It is important to understand how to determine rotation directions to avoid confusion through mirror-imaging parts accidentally.
- 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.
- When a bender collet rotates CCW to rotate positive, then it uses the American industry standard, the standard for our VTube and CNC Bender software. In this case, +90 would rotate the chuck 90 degrees CCW.
- When a bender collet rotates CW to rotate positive, it uses the non-American industry standard, the opposite of our software. In this case, +90 would rotate the chuck 90 degrees CW.
The engineering community uses a simple right-hand/left-hand rule to designate which way an axis spins positive:
This illustration demonstrates the RIGHT-HAND rule*
In this "right-hand rule" illustration:
European and Asian benders often follow the LEFT-HAND rule - which means that positive rotates CW. (To prove this, hold your left hand so that your thumb is pointing at you. What direction do your fingers curl?)
Credit: The illustrations above are from the BobCAD-CAM site.