3 Economical 4-edge inserts and 3 types of chipbreakers for various applications Chipbreaker selection GM chipbreaker − General use PR1230 for carbon steel PR1210 for cast iron • Wide chipbreaker covers variety of materials. • Good balance of cutting edge strength and sharp cutting. Features Wide chipbreaker Small chips for better evacuation 2 1 SM chipbreaker − Sharper edge PR1225 for stainless steel and low carbon steel • U-shaped cutting edge. • Good chipcontrol at sticky material. • Sharp cutting by large rake angle. GH chipbreaker − Tough edge PR1230 for hard material, with interruption • Wider chipbreaker prevents breakage by pressed chips. • Stable cutting edge. Outer edge Inner edge Outer edge Inner edge Flat chipbreaker Ideal continuous chips Chipping resistance comparison Number of holes GH Chip G b H re C a hi k p e b r eaker 2 2 8 8 0 0 C50 C50 Competit C o o r m G petitor G Competitor H Interrupted drilling by displacing center of hole by 8 m C m o . mpetitor H Interrupted drilling by displacing center of hole by 8 mm. Conventional tool Conventional tool 0 40 80 120 160 200 240 280 Cutting condition 0 s Workpi 4 ec 0 e: C50, w 8 it 0 h coolan 1 t 2 , V 0 C = 80 1 m 6 / 0 min, f = 2 0 0 .0 0 8 mm/ 2 re 4 v, 0 280 H = 10 mm, Dc = ø20 mm, H = 60 mm 3
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