Grinding fixture and assembly

A grinding assembly for grinding a helical shape upon a cutting insert, said assembly comprising:

• a grinder comprising a grinding wheel and a grinder table, said grinding wheel being rotatable about a fixed axis, and said grinder table being adjustable in at least two directions;
• and
• a grinding fixture comprising:
• a bottom sine base for varying a first angle, said bottom sine base comprising a bottom surface dimensioned to mate with the grinder table,
• a top surface, and a mechanism for providing angular adjustment between said top surface and said bottom surface;
• a shaft for providing rotation of the insert about an axis of rotation, said shaft being rotatably attached to, and extending in substantially perpendicular relation from, said top surface of said bottom sine base;
• a primary slide for adjusting a position of a locating point on the insert in a first direction relative to said axis of rotation, said primary slide being rotatably attached to said shaft in parallel relation to said top surface of the bottom sine base;
• a cross slide for adjusting the locating point in a second direction relative to the axis of rotation, said cross slide being attached to, and disposed in perpendicular relation with said primary slide;
• and
• a top sine assembly slide for varying a second angle, said top sine assembly being fixedly attached to said cross slide and comprising a connection surface and an insert holder for securing said insert to said grinding fixture, said insert holder being fixedly connected to said connection surface of said top sine assembly;
• wherein the insert is secured in the insert holder, the bottom sine base, top sine base, primary slide and cross slide are adjusted to predetermined positions, and the insert is rotated through a predetermined arc relative to said bottom sine base such that a helical shape is ground on the insert by said grinding wheel.