Workpiece securing apparatus for a machine tool

Apparatus for securing a workpiece to the table of a machine tool, comprising a base plate including means defining a precision X-Y grid pattern of threaded holes and precision bores having parallel axes, a body member, a toggle clamp mounted on said body member for releasably gripping the workpiece, said toggle clamp including a bracket secured to said body member, a clamping arm pivotally connected to said bracket, a handle member pivotally connected to said bracket, a link member pivotally connected to both said clamping arm and said handle member, said body member having a bottom surface and defining a cylindrical bore extending upwardly from said surface, a stud member having a cylindrical head portion extending into said bore in closely fitting relation and providing for rotating said body member on said stud member while maintaining axial alignment of said body member and said stud member, said stud member further including a threaded portion projecting downwardly from said head portion for engaging one of said threaded holes within said base plate, means for retaining said head portion of said stud member within said bore of said body member for relative rotation, and means for engaging said head portion of said stud member to rotate said stud member within said bore for tightening said threaded portion into said threaded hole within said base plate.

Apparatus for securing a workpiece to a table of a machine tool, comprising a base plate including means defining a precision X-Y grid pattern of threaded holes and precision bores having parallel axes, a set of separate slot defining plates each including means defining a set of precision bores having parallel axes, each of said slot defining plates having a set of peripheral edge surfaces each defining an undercut recess, said precision bores within each of said slot defining plates being located in precise axial alignment with corresponding said precision bores within said base plate when said slot defining plate is properly positioned on said base plate, a set of precision locating pins extending within the axially aligned said precision bores within said base plate and each of said slot defining plates, means for releasably securing each of said slot defining plates directly to said base plate, and said undercut recess defined by at least one of said edge surfaces of each slot defining plate cooperating with said undercut recess defined by at least one of said edge surfaces of an adjacent said slot defining plate to define an undercut slot when said slot defining plates are secured to said base plate.

Apparatus adapted for precisely locating and securing a workpiece having at least two internal holes to a table of a machine tool, comprising a base plate including means defining an array of perpendicular rows of threaded holes and precision bores having parallel axes and forming an X-Y grid pattern, a set of first and second locating pins corresponding to the holes within the workpiece, each of said pins having a precision cylindrical upper portion, a set of blocks mounted on said base plate and supporting said locating pins with parallel spaced axes aligned with the axes of the holes within the workpiece and with said cylindrical upper portions of said pins being precisely concentric with the holes within the workpiece, some of said blocks having a set of precision bores aligned with said precision bores within said base plate, means for securing said blocks to said base plate and providing for moving and adjusting one of said locating pins and the supporting said block laterally on said base plate to accommodate workpiece holes having different spacing, and a set of precision locating pins extending into said aligned precision bores within said blocks and said base plate.