Cut-Off Edge width W (mm)Edge width W (mm) RemarksCoolant KGD type GDM/GDMS/GDG type KGD recommended cutting conditions (PM / PH chipbreaker) Recommended insert grades f (mm/rev) ( Vc: m/min) PM PH Workpiece material MEGACOATNANO MEGACOAT Edge width CW (mm) PR1535 PR1225 PR1215 2~4 2 3~4 Carbon steel ✩ ★ ✩80 ~ 20080 ~ 200100 ~ 200 0.08 ~ 0.18 0.10 ~ 0.25 0.15 ~ 0.28 Alloy steel ✩ ★ ✩70 ~ 18070 ~ 18080 ~ 180 Stainless steel ★60 ~ 150 ✩60 ~ 150 ✩60 ~ 1500.06 ~ 0.12 0.05 ~ 0.12 0.08 ~ 0.15 Cast iron - - ★100 ~ 2000.08 ~ 0.18 0.10 ~ 0.25 0.15 ~ 0.28 ★: 1st Recommendation ✩: 2nd Recommendation H Example of feed [ ■ In the graph indicates the most recommended value of feed (f)] ࣭PM chipbreaker [ Workpiece material: S50C ] 2~4 0.1 0.2 0.3 Feed rate f (mm/rev) ࣭PH chipbreaker [ Workpiece material: S50C ] 3~4 2 0.1 0.2 0.3 Feed rate f (mm/rev) Caution (Cut-off) 1. Be sure to perform wet processing. Apply enough coolant to the cutting edge. 2. Keep a constant rate during processing so that optimum product life will be achieved. 3. Cut-off as close to the chuck as possible. 4. Lower the feed rate to 1/2 to 1/3 at the near center to prevent impact caused by machining. H30