Methods and apparatus for grinding spiral tool cutting edges having non-circumferentially relieved edges

In a grinder attachment for assisting a tool grinder to grind a spiral tool cutting edge having a non-circumferentially relieved land surface;

• the attachment being mounted on a tool table slide mounted for movement linearly to the vicinity of a grinding wheel peripheral edge surface and there being a guide finger fixed at the wheel edge surface which is engageable with the cutting edge just behind the portion of the edge being ground to guide the rotary and linear travel of the tool being ground relative to the grinding wheel;
• said attachment including a base supported on the table slide so that the attachment moves in a linear path with said table slide to the grinding wheel;
• a non-driven centerless support on said base on which a tool is supported with its axis generally parallel to the table slide;
• a lever member pivoted to swing about an axis on the centerless support and mounting a freely rotatable roller movable in a path with swinging of the lever to engage the shank of a tool resting on said support;
• the lever member having a handle on the opposite side of the axis from the roller;
• and a grip on said attachment separate from but adjacent said lever handle in juxtaposted position with it so that it can be gripped with the same hand which holds said lever to "feel" and gauge the force with which the roller is frictionally held down on the tool shank while the thumb of the hand rotates the roller to feed the edge in a spiral path as the attachment moves forward on the table to grind the spiral edge.