TopGroove™ Machining Guidelines Machining Guidelines for Face Grooving Operations • External RH holder LH holder RH insert C Toolholders LH insert LH holder B groove depth RH holder Standard NF/NDF Inserts maximum minimum groove depth B groove diameter C insert family mm mm NF-3 1,52 23,9 NF-3 2,39 30,5 NF-3 3,18 36,1 NF-3 3,81 41,3 NFD-3 6,35 47,6 NFD-4 9,53 57,2 NFD-4 12,70 57,2 Machining Guidelines for Face Grooving Operations • External RH bar RH insert C Boring Bars LH insert LH bar B groove depth Standard NG/NGD Inserts maximum minimum groove depth B groove diameter C insert family mm mm NG-2 1,27 54,0 NG-2 2,79 88,9 NG-3 2,39 101,6 NG-3 3,18 127,0 NG-3 3,81 139,7 NGD-3 6,35 174,6 NG-4 3,81 152,4 NG-4 6,35 209,6 NGD-4 9,53 222,3 NGD-4 12,70 222,3 E90 widia.com