±0.025 l GDP Inserts for Precision Grooving of V-Shaped Piston Grooves 7° W alpha° M R Tmax-r Tough Recommended Dimensions 1  Hard Machining Data f groove Designation W ±0.02 R T max-r alpha l M IC308 IC908 (mm/rev) GROOVE-TURN GDP 1.20-0.30-4768V2Q 1.20 0.30 6.50 11.0 25.00 2.40 • • 0.12-0.18 GDP 1.55-0.30-1404Q 1.55 0.30 6.50 10.0 20.90 3.50 • 0.12-0.18 GDP 1.75-1406Q 1.75 0.30 7.50 - (1) 20.95 3.50 • 0.12-0.18 (1) Left edge 7.17° + right edge 7.83° l2 HLPGR/L h h Tools for L-Type LPGIR/L Inserts h4 l1 T f b A Designation T max-r h h 1 h 4 b A f l 1 l 2 Insert HLPGR/L 2525-12-A3.5-T25 25.00 25.0 25.0 7.0 25.0 3.50 23.3 160.00 50.0 LPGIR/L 12 SR M6X20 DIN912 HW 5.0 HLPGR/L 3225-12-A3.5-T25 25.00 32.0 32.0 - 25.0 3.50 23.3 160.00 50.0 LPGIR/L 12 SR M6X20 DIN912 HW 5.0 HLPGR/L 2525-12-A4.5-T30 30.00 25.0 25.0 7.0 25.0 4.50 22.8 160.00 55.0 LPGIR/L 12 SR M6X20 DIN912 HW 5.0 HLPGR/L 3225-12-A4.5-T30 30.00 32.0 32.0 - 25.0 4.50 22.8 160.00 55.0 LPGIR/L 12 SR M6X20 DIN912 HW 5.0 HLPGR/L 2525-16-A6-T30 30.00 25.0 25.0 7.0 25.0 6.00 22.0 160.00 55.0 LPGIR/L 16 SR M6X20 DIN912 HW 5.0 HLPGR/L 3225-16-A6-T30 30.00 32.0 32.0 - 32.0 6.00 22.0 160.00 55.0 LPGIR/L 16 SR M6X20 DIN912 HW 5.0 • In case of face penetration prior to radial grooving, please check that the lower insert support is relieved from the groove's outer diameter. For inserts, see pages: LPGIR/L (260) D1 min D1 min LPGIR/L Inserts for Axial Grooves Inside Radial Grooves and for Radial L3 M Grooves Inside Axial Grooves a Tmax-a R W R Right-hand shown Dimensions Designation W ±0.02 R M T max- a L 3 a D 1 min IC907 LPGIR/L 12-8-2T4PR 2.00 0.20 4.00 3.50 30.00 8.00 200.0 • LPGIR/L 12-8-210T4 2.00 1.00 4.00 3.50 30.00 8.00 200.0 • LPGIR/L 12-8.5-3T5PR 3.00 0.30 3.50 4.50 30.00 8.50 200.0 • LPGIR/L 12-8.5-315T5 3.00 1.50 3.50 4.50 30.00 8.50 200.0 • LPGIR/L 12-9.5-4T6PR 4.00 0.40 3.50 5.50 30.00 9.50 200.0 • LPGIR/L 12-9.5-420T6 4.00 2.00 3.50 5.50 30.00 9.50 200.0 • LPGIR/L 12-11-5T6.5PR 5.00 0.40 4.50 6.00 30.00 11.00 200.0 • LPGIR/L 12-11-525T6.5 5.00 2.50 4.50 6.00 30.00 11.00 200.0 • LPGIR/L 16-15.5-3T9PR 3.00 0.30 6.00 8.50 30.60 15.50 200.0 • LPGIR/L 16-15.5-315T9 3.00 1.50 6.00 8.50 30.60 15.50 200.0 • LPGIR/L 16-15.5-4T9PR 4.00 0.40 6.00 8.50 30.60 15.50 200.0 • LPGIR/L 16-15.5-420T9 4.00 2.00 6.00 8.50 30.60 15.50 200.0 • LPGIR/L 16-15.5-5T9PR 5.00 0.40 6.00 8.50 30.60 15.50 200.0 • LPGIR/L 16-15.5-525T9 5.00 2.50 6.00 8.50 30.60 15.50 200.0 • • For cutting speed recommendations and user guide, see pages 340-351 For tools, see pages: HLPGR/L (260) 260 ISCAR