The process consists in using the knife to cut a reference mark (e.g. a cross), and then jogging the spindle to the respective reference mark. The router's current position is the offset between the two tools.

Needed tools:

• Knife blade.
• Pointed bit (e.g. 'V' cutter).
• Sample material to cut with the knife.

Create reference mark:

• Release toolholder from chuck.
• Place knife blade into the knife.
• Rotate the knife parallel to the 'Y' axis.
• Zero the 'X' axis.
• Cut the first line along the 'Y' axis.
• Once the first line is cut, position the knife in the center of the cut line.
• Rotate the knife parallel to the 'X' axis. This can be achieved by rotating 0.25 of a revolution in either direction.
• Zero the 'Y' axis.
• Cut the second line along the 'X' axis.

Note: To precisely rotate the knife, click on Goto and then add or subtract the desired amount to the A axis.

Knife cutting reference mark

Measure and save the offset:

• Add toolholder with pointed bit into the chuck.
• Carefully position the pointed bit in the intersection of both lines.
• Once the bit is correctly positioned, the current 'X' and 'Y' position is the offset between the knife and the spindle.
• In Setup->Tools, add the offset as a tool and add special case as 10.

Offset measured with a 'V' cutter