Workpiece mounting device for cutting a circle

a device for mounting a workplace on the table of a motor-driven saw blade to cut a circle of a selected diameter in the workpiece, said table having a planar work surface in a miter groove formed therein and said saw blade being mounted in operative proximity with said work surface in spaced relation with said miter groove, said device comprising

• a guide member having a linearly extending guide groove formed therein;
• a pivot pin guided in said guide groove in substantially perpendicular relation with said guide member and releasably securable to said guide member at a selected point of said guide groove;
• a mounting clamp for releasably securing said guide member to the miter groove of the table of a motor-driven saw blade in a manner whereby said guide member abuts the planar work surface of said table with said guide groove substantially prependicular to said miter groove and said pivot pin extending substantially perpendicularly to said work surface at a selected distance from said saw blade so that a workpiece totatably mounted on said pivot pin substantially parallel to said work suface is cut in a circle by said saw blade as said workpiece is rotated, the diameter of said circle being twice the distance of said pivot pin from said saw blade;
• and
• wherein said guide member has a length and flanges extending along its length, and said mounting clamp comprises a base member accommodated in said miter groove and having securing means for releasably securing said base member in said miter groove and clamping means for releasably clamping the flanges of said guide member.