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WIDIA ™ VariTurn ™ Cast Iron • Grey and Ductile Irons
� �Step 1 • Select the insert geometry Negative Inserts
Positive Inserts feed rate( mm / rev) feed rate( mm / rev)
2P Finishing
.. MA
Heavy Roughing
depth of cut( in)
depth of cut( mm)
1P
Finishing
depth of cut( in)
depth of cut( mm)
feed rate( in / rev) feed rate( in / rev)
7N Heavy Roughing
� �Step 2 • Select the grade
cutting condition
Negative Insert Geometry
Positive Insert Geometry
2P
.. MA
7N
1P
heavily interrupted cut TN20K TN20K TN20K TN20K lightly interrupted cut TN20K TN20K TN20K TN20K
varying depth of cut, casting, or forging skin
TN20K TN20K TN20K TN20K
smooth cut, pre-turned surface TN20K TN20K TN20K TN20K
� �Step 3 • Selecting the cutting speed
Grey Cast Iron
speed— m / min
Starting Conditions
Material
Group
grade
60
150
240
330
420
510
600
690
780
m / min
K1 TN20K 270
Ductile, Compacted Graphite, and Malleable Cast Irons(< 80 KSI tensile strength)
speed— m / min
Starting Conditions
Material
Group
grade
60
150
240
330
420
510
600
690
780
m / min
K2 TN20K 216
Ductile, Compacted Graphite, and Malleable Cast Irons(> 80 KSI tensile strength)
speed— m / min
Starting Conditions
Material
Group
grade
60
150
240
330
420
510
600
690
780
m / min
widia. com
K3 TN20K 189
B115
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