Notched grind wheel and method to manufacture a rotor blade retention slot

A grind wheel comprising:

• a hub defined about an axis of rotation;
• a web defined about said hub which defines a web thickness;
• and
• a rim defined about said web, said rim having a rim thickness greater than said web thickness, a first notch and a second notch on one side of said web to define a first notch axis along a first secant line with respect to said rim and a first notch and a second notch on an opposite side of said web to define a second notch axis along a second secant line with respect to said rim.

A method of grinding a slot base of a blade retention slot within a rotor disk comprising:

• rotationally aligning a grind wheel about an axis of rotation to align a first notch with a first and second opposed lobe of the blade retention slot of the rotor disk;
• transiting the grind wheel along the blade retention slot that the first notch is passed between a lobe width defined by the first and second opposed lobe of the blade retention slot;
• rotating the grind wheel about the axis of rotation;
• and
• transiting the rotating grind wheel along the blade retention slot to grind a slot base with a rim of the grind disk, the slot base having a width greater than the lobe width of the blade retention slot.