Overhead radius dresser for grinding wheels

An overhead radius dresser for a grinding wheel for surface grinders or the like, with the grinding wheel being rotatable upon a first axis and having a spindle, said overhead radius dresser comprising;

• a main housing having a cylindrical bore mounted upon said spindle;
• a manually rotatable main shaft journaled within said housing reciprocally rotatable upon a second axis at right angles to and spaced from said first axis;
• a slide plate at right angles to and mounted upon said shaft having the same axis as said second axis and also having a transverse axis parallel to said first axis;
• a slide housing mounted upon and in registry with said slide plate and said second axis and adapted to travel along said transverse axis and said slide plate in opposite directions across said second axis;
• a slide arm mounted upon and depending from said slide housing for longitudinal adjustments towards and away from said second axis;
• a diamond holder arm secured to and depending from said slide arm;
• a diamond tool adjustably mounted upon and extending transversely of said holder arm having a diamond head in registry with said second axis of rotation adapted for operative engagement with the grinding wheel during rotation thereof;
• manual reciprocal rotation of said main shaft over a predetermined arc from a central position adapted to dress a corresponding radius in the grinding wheel periphery;
• said slide housing remaining in registry with said slide plate and said second axis during selective rotation of said main shaft in both directions relative to said central position for normal radius dressing of the grinding wheel;
• said slide housing being adapted for lateral movement relative to said slide plate along said transverse axis, after the main shaft is fully rotated in one direction from said central position, said diamond head moving tangentially from its intial arc of rotation for tangentially dressing the flat outer angle of the grinding wheel;
• and stop screw means including a pair of reciprocally movable pins mounted upon and interposed between said slide plate and slide housing to facilitate stopping at the second axis and adapted to retaininingly engage said slide housing against travel along said transverse axis relative to said slide plate;
• and further adapted to selectively facilitate said travel for tangential surface dressing of tangential angles of the grinding wheel;
• said main shaft having a threaded axial bore;
• a bushing secured within said housing receiving said main shaft;
• a radially adjustable wedge pin mounted within said main shaft at one end adapted for frictional retaining engagement with said bushing;
• its other end having a 45.degree. wedge surface extending into said axial bore;
• a second wedge pin within said axial bore having a 45.degree. wedge surface at one end in registry with the wedge surface of said first wedge pin;
• and a manually rotatable screw threaded into said axial bore;
• and its inner end adapted to operatively engage and move said second wedge pin into engagement with and move said first wedge pin securing said main shaft against rotation within said bushing.