Image Number 5 for United States Patent #6968768.
The disclosure describes a slitting saw used to cut an opening in a pipe. The saw generally comprises a housing mounted on an XYZ positioning system, a drive assembly and a cutting blade. A motor is used to drive a gear train which creates rotating of the cutting blade. The cutting blade makes a bevel cut into the pipe which allows for a new piece to be welded into the window cut by the present invention.