Page 135 - Master Catalog 2017, Inch

WIDIA VariTurn
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Cast Iron • Gray and Ductile Irons

„ Step 1 • Select the insert geometry

Negative Inserts Positive Inserts

feed rate (mm/rev) feed rate (mm/rev)

2P 1P
Finishing Finishing
depth of cut (in) depth of cut (mm) depth of cut (in) depth of cut (mm)

..MA
Heavy Roughing

feed rate (in/rev) feed rate (in/rev)

7N
Heavy Roughing
„ Step 2 • Select the grade

Negative Insert Geometry Positive Insert Geometry
cutting condition 2P ..MA 7N 1P
heavily interrupted cut TN20K TN20K TN20K TN20K
lightly interrupted cut TN20K TN20K TN20K TN20K
varying depth of cut, TN20K TN20K TN20K TN20K
casting, or forging skin
smooth cut, pre-turned surface TN20K TN20K TN20K TN20K

„ Step 3 • Selecting the cutting speed

Gray Cast Iron speed — m/min (SFM) Starting Conditions
Material 60 150 240 330 420 510 600 690 780
Group grade (200) (500) (800) (1100) (1400) (1700) (2000) (2300) (2600) m/min SFM
K1 TN20K 270 900

Ductile, Compacted Graphite, and Malleable Cast Irons
(<80 KSI tensile strength) speed — m/min (SFM) Starting Conditions
Material 60 150 240 330 420 510 600 690 780
Group grade (200) (500) (800) (1100) (1400) (1700) (2000) (2300) (2600) m/min SFM
K2 TN20K 216 720

Ductile, Compacted Graphite, and Malleable Cast Irons
(>80 KSI tensile strength) speed — m/min (SFM) Starting Conditions
Material 60 150 240 330 420 510 600 690 780
Group grade (200) (500) (800) (1100) (1400) (1700) (2000) (2300) (2600) m/min SFM
K3 TN20K 189 630

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