l External toolholder selection for productivity improvement Guideline for roughing: ap=~2.5mm Improvement of Finishing (1) Use Goose-neck Holder Use Small Double Sided Tooling E Improvement of Finishing (2) Use External Sleeve Holder Fig.1 Small Tools Guideline for roughing: ap=1.5~5mm Improvement of Finishing (1) Use Goose-neck Holder Use FP-TK Chipbreaker (G-class negative insert) Improvement of Finishing (2) Use External Sleeve Holder Fig.2 Guideline for roughing: ap= over 4mm Improvement of Finishing (1) Use Goose-neck Holder Use grooving toolholder Improvement of Finishing (2) Use External Sleeve Holder Fig.3 E9