BACK

CLASSIFICATION OF GRADES AND CHIP BREAKERS FOR TURNING

Selection of Optimum Insert for Turning The following diagrams show for each workpiece, the optimal combination of suitable grades and chip breakers for each application area in turning.

Negative inserts for steel | Negative inserts for stainless steel | Negative inserts for cast iron | Negative inserts for heatresistant alloy | Negative inserts for titanium alloy | 7° positive inserts for steel | 11° positive inserts for steel |

NEGATIVE INSERTS FOR STEEL

FEATURES OF MAIN CHIP BREAKERS

Application	Breaker	Shape	Features
Finish Cutting	FH		Exclusive chip breaker for finish cutting.
Light Cutting	SH		Better chip control at small depth of cut and high feed rate. Suitable machineability with high rake angle and inclinations.
Medium Cutting	MV		Suitable for copying and facing. Suitable machineability with positive land.
Semi-Heavy Cutting	GH		Tough cutting edge, good for rough cutting or scaling, interrupted cutting. Double-sided chip breaker.
Heavy Cutting	HX		The variable land increases the strength and security of the cutting edge. Wide application range from continuous to interrupted cutting.

ADDITIONAL CHIP BREAKERS

Application	Workpiece	Breaker	Shape	Features
Finish Cutting	Mild Steel	FS		Suitable for finishing of mild steel and stainless steel.
Light Cutting	Steel	SA		Excellent chip control by forcibly breaking chips.
Medium Cutting	Steel	MA		Suitable for copying. Suitable machineability with positive land.
Medium Cutting	Hard Steel	MH		Suitable for copying. High strength cutting edge with flat land.
Medium Cutting	Hard Steel	Standard		High strength cutting edge.
Heavy Cutting	Mild Steel	HZ		The positive land reduces cutting forces. Tear-shaped impressions in the rake face reduce cratering.
Heavy Cutting	Hard Steel	HV		Wide land increases the strength of the cutting edge. Wave-shaped rake face increases heat resistance.

NEGATIVE INSERTS FOR STAINLESS STEEL

FEATURES OF MAIN BREAKERS

Application	Breaker	Shape	Features
Finish Cutting	FS		Suitable for finish cutting of stainless steels and mild steels.
Light Cutting	SH		Better chip control at low depth of cut and high feed rate. Suitable machineability with high rake angle and inclinations.
Medium Cutting	MS		Standard breaker with good sharpness. Suitable for medium cutting of mild steel and stainless steel.
Medium Cutting	ES		2 step breaker with good sharpness. Right or left hand chip breaker gives good chip control at small depths of cut.
Medium Cutting	MH		Better chip control over a wide application area. New strengthened cutting edge for reliable machining.
Semi Heavy Cutting	GH		Tough cutting edge, good for rough cutting or scaling, interrupted cutting. Double-sided chip breaker.
Heavy Cutting	HZ		The positive land reduces cutting forces. Tear-shaped impressions in the rake face reduce cratering.

NEGATIVE INSERTS FOR CAST IRON

FEATURES OF MAIN BREAKERS

Application	Breaker	Shape	Features
Light- Medium Cutting	Standard		Standard type general breaker. High strength of cutting edge and high fracture resistance.
Semi Heavy Cutting	Flat Top		Steady machining even for unstable cutting. High cutting edge rigidity.
Semi Heavy Cutting	GH		Tough cutting edge, good for rough turning or scaling, interrupted cutting. Double-sided chip breaker.

NEGATIVE INSERTS FOR HEAT-RESISTANT ALLOY

FEATURES OF MAIN BREAKERS

Application	Breaker	Shape	Features
Finish Cutting	FJ (G Class)		Finishing for difficult-to-cut materials. Sharp cutting edge gives excellent surface finish. The inclined edge reduces cutting resistance.
Light Cutting	MJ		Finishing to medium cutting for difficult-to-cut materials. Sharp cutting edge gives excellent surface finish. The inclined edge reduces cutting resistance.
Medium Cutting	MS		Excellent cutting performance. Medium cutting for difficult-to-cut materials.
Semi Heavy Cutting	GJ		Semi-heavy cutting for difficult-to-cut materials. Excellent balance between sharpness and strength of cutting edge. Excels in wear resistance on the rake face.

NEGATIVE INSERTS FOR TITANIUM ALLOY

FEATURES OF MAIN BREAKERS

Application	Breaker	Shape	Features
Finish Cutting	FJ (G Class)		Finishing for difficult-to-cut materials. Sharp cutting edge gives excellent surface finish. The inclined edge reduces cutting resistance.
Light Cutting	MJ		Finishing to medium cutting for difficult-to-cut materials. Sharp cutting edge gives excellent surface finish. The inclined edge reduces cutting resistance.
Medium Cutting	MS		Excellent cutting performance. Medium cutting for difficult-to-cut materials.
Semi Heavy Cutting	GJ		Semi-heavy cutting for difficult-to-cut materials. Excellent balance between sharpness and strength of cutting edge. Excels in wear resistance on the rake face.

7° POSITIVE INSERTS FOR STEEL

FEATURES OF MAIN BREAKERS

Application	Breaker	Shape	Features
Finish Cutting	R / L-F (G Class)		Finish cutting. Lead breaker controls chip flow. Sharp cutting edge gives excellent surface finish.
Finish Cutting	FV (G Class)		Sharp cutting edge and low resistance dots achieve excellent cutting performance. Suitable for low depth of cut and low feed rates.
Medium Cutting	Standard (G Class)		Medium cutting.

11° POSITIVE INSERTS FOR STEEL

FEATURES OF MAIN BREAKERS

Application	Breaker	Shape	Features
Precision Finish Cutting	R / L-FS (G Class)		Precision finishing. Small width lead breaker for preferentially excellent chip control. Sharp cutting edge gives excellent surface finish.
Precision Finish Cutting	R / L-F		Finish cutting. Lead breaker controls chip flow. Sharp cutting edge gives excellent surface finish.
Light Cutting	Standard (G Class)		Light cutting. The double dots promotes chip discharge for mild steel machining and at low depths of cut.
Medium Cutting	MV (M Class)		A positive insert and the large rake angle achieves sharp cutting edge performance. The double breakers and round-shaped dots in the rake face achieves a wide range of chip discharge.
Medium Cutting	Standard (M Class)		Medium cutting.