Power tool assembly with integrated tool support fixture

A tool assembly comprising:

• a tool having a working end configured to perform a cutting operation on a workpiece;
• and
• a support fixture for supporting said tool on the workpiece, said support fixture including:
• a clamping assembly configured for clamping onto the workpiece,
• a miter plate pivotably mounted on said clamping assembly to permit pivoting of said miter plate to variable angular orientations relative to said clamping assembly,
• a guide rail assembly mounted on said miter plate and including an elongated member defining a travel path of said tool and a cutting path of said working end corresponding to a line of cut of said working end of said tool for extending across the workpiece, the line of cut spaced from the elongated member and the travel path,
• a carriage slidably supported on said elongated member, and
• a tool mount carried by said carriage and supporting said tool,
• wherein said miter plate pivots about a virtual pivot located at a virtual pivot point defined on said line of cut such that said line of cut extends through said virtual pivot and said virtual pivot point, and
• wherein said miter plate is mounted to said clamping assembly at a mounting location that is spaced from said virtual pivot point.