The Oval Rotation field controls how much the foot block will rotate before cutting. Adjust the Oval Rotation if you are getting Bumps or Feathers on an oval outside.

If you have too much rotation on an oval opening, you will get a Feather, too little and you will get a Bump.

Select the desired Cartridge Type Tab and then the bevel type you want to edit from the Current Bevel Type dropdown control before making adjustments. Select Front of Mat if it is being cut from the front of the mat.

The blade returns to the outside of the starting point of an oval outside cut, creating a bump in the oval.

Increase the Oval Rotation.

The blade returns to the inside of the starting point of an oval outside cut, creating a feather in the oval.

Decrease the Oval Rotation.

In Rotation, eight points equals one degree of rotation. 

Users usually make adjustments four points at a time.

Increase the oval rotation to turn the foot block clockwise to get rid of a bump. 

Decrease the oval rotation to turn the foot block counterclockwise to get rid of a feather.

Optionally, use the Circle/Oval Rotation Utility to fine-tune specific sizes of circles/ovals.