HI Back-turning of Double-hole Back-turning of Double-hole HI Insert for Back - turning TC vw T 7 II > -< i i ' i i i / i > i 1C !> (! \ t- -i \ i -o \ i Insert Machining Insert Insert Edge Corner - R Chipbreaker Lead Front Carbide grades T \j name Type size hand width name angle rake angle i i AAA i / k - j Insert Name Machining Type Insert Size @9 0 0 i r / / 7 i i \ \ i VW I i i i i \ \ \ i 6: insert length is 32.0 mm i i i i i Double Hole Type of insert B: Back Turning 7: insert length is 43.0 mm T / h 4 \ / h 4 \ / / AAA L Insert Hand Edge Width Corner-R 0 eg EBB 00 : no edge width R : right hand 05 : 0.5 mm 199 000: 0.00 008 : 0.08 200 L : left hand 10 : 1.0 mm 15 : 1 5 mm , L R T 7Z / l I I I Chipbreaker Name Lead Angle Front Rake Angle I I E 2L , I I / \ i / \ V t h -t h -\ VA? h -\ - ) I S3 BBS C a none: no front rake angle 20: 20 ° 30: 35 ° 35: 35 ° 08 F: 8 ° Fig . 1 10F: 10° NB Type BC Type L R i / \ / \ i i j i k j V 7 I I Carbide Grades / i I V \ / \ I T T T T I k A - -\ A - -\ h ~\ J ulB e a TTIP 30 TTIM45 Fig . 2