Cutting Tool and Cutting Insert Therefor

A cutting tool having a feed direction (F) and comprising an insert holder and a cutting insert releasably retained in an insert pocket formed between an upper jaw and a lower jaw of the insert holder, the insert pocket having a longitudinal axis defining a forward to rear direction;

• the upper jaw comprising an upper jaw lower surface;
• the lower jaw comprising:
• a lower jaw upper face facing the upper jaw lower surface;
• a forward projection adjacent a forward end of the insert holder, the forward projection having a forward projection front abutment surface inclined at a first angle (α) to the feed direction (F) and a forward projection back abutment surface inclined at a second angle (β) to the feed direction (F), the upper jaw having a free end located longitudinally rearward of the forward projection;
• a rear projection separated from the forward projection by a lower jaw indentation and having a rear projection abutment surface;
• the cutting insert comprising:
• an upper insert surface, a lower insert surface and a peripheral side surface extending therebetween;
• at least one cutting portion adjacent a longitudinally extending shaft portion;
• a recess in the lower insert surface adjacent to and extending into the at least one cutting portion, the recess having a front recess abutment surface inclined at the first angle (α) to a lower edge of the shaft portion and a back recess abutment surface inclined at the second angle (β) to the lower edge of the shaft portion, wherein the first angle (α) is greater than the second angle (β);
• a lower abutment surface in the form of a longitudinal groove in the lower insert surface extending along the shaft portion;
• and
• an upper abutment surface in the form of a longitudinal groove in the upper insert surface extending along the shaft portion;
• wherein:
• at least a forward portion of the upper jaw lower surface abuts the upper abutment surface of the upper insert surface;
• the forward projection front abutment surface abuts the front recess abutment surface;
• the forward projection back abutment surface abuts the back recess abutment surface;
• and
• the rear projection abutment surface abuts the lower abutment surface.