The V-Groove Interior Overcut (white arrow) is where the cut continues into the corner before retracting the blade from the fallout on the inside cut of the V-Groove.  

Interior Cuts cut into the fallout of the V-Groove, not the matboard.

Select the desired Cartridge Tab and then the V-Groove bevel type from the Current Bevel Type dropdown control before making adjustments.

• V-Groove

The V-Groove Interior Overcut, which is part of the inside cut of the V-Groove, is displayed on the V-Groove Configuration Map and on the associated field as a white arrow.

Check against the Configuration Map of the V-Groove you are cutting to determine specifically which cuts are the Interior Overcuts.

Interior Cuts cut into the fallout of the V-Groove, not the matboard. 

The inside of the V-Groove cuts first in a clockwise direction. These are internal cuts, which cut into the V-Groove fallout.

The outside of the V-Groove cuts second in a counter-clockwise direction. These are external cuts, which cut into the matboard.

The Interior Overcut is part of the first pass.

This is viewed from the front of the mat. If the Interior Overcut retracts the blade too late, it makes the interior overcut too long on the inside cut of the V-Groove.

Decrease the Interior Overcut. 

The corners will now meet up properly.

When making adjustments, click either the minus or plus button (-/+) at the end of the desired field about five or six times in the direction indicated. Click OK and do a test cut. Check the results of the cut and continue making adjustments until the desired outcome is achieved.

This is viewed from the front of the mat. If the Interior Overcut retracts the blade too soon, it makes the interior overcut too short on the inside cut of the V-Groove.

Increase the Interior Overcut.

The corners will now meet up properly.

When making adjustments, click either the minus or plus button (-/+) at the end of the desired field about five or six times in the direction indicated. Click OK and do a test cut. Check the results of the cut and continue making adjustments until the desired outcome is achieved.

This is viewed from the front of the mat. For an Exterior Overcut where the blade comes out of the matboard instead of the fallout of the V-Groove, see V-Groove Exterior Overcut.