Speed and Feed Charts - Ballnose Finishers
Speed & Feed Charts for Ballnose Finishers
Medium Steel: 1018, 1020, 4140, 4150, P-20
.375 / 10mm .500 / 12mm .625 / 16mm .750 / 20mm 1.00 / 25mm 1.25 / 32mm
RPMs
 3000-4000 3000-4000 3000-4000 2800-3400 2800-3400 2000-3000  
Feed Rate (inches/minute)
40-60 40-60 40-60 60-80 60-100 60-100  
Depth of Cut
 .012-.032 .020-.040 .020-.040 .020-.040 .020-.060 .032-.060  
Stepover
 .012-.020 .012-.020 .012-.032 .012-.032 .012-.040 .012-.064  
Tool Steel: 2, D2, S7, GM190
.375 / 10mm .500 / 12mm .625 / 16mm .750 / 20mm 1.00 / 25mm 1.25 / 32mm
RPMs
 2600-3200 2600-3200 2200-2800 2200-2800 2200-2800 2000-2600  
Feed Rate (inches/minute)
40-60 60-80 60-80 60-100 60-150 60-200  
Depth of Cut
 .010-.020 .010-.024 .010-.030 .015-.040 .020-.060 .020-.080  
Stepover
 .010-.015 .010-.020 .010-.030 .010-.030 .020-.050 .020-.100  
Iron: Cast, Nodular, Ductile
.375 / 10mm .500 / 12mm .625 / 16mm .750 / 20mm 1.00 / 25mm 1.25 / 32mm
RPMs
 2400-3600 2400-3600 2400-3600 2000-3200 2000-3200 2000-3000  
Feed Rate (inches/minute)
60+ 60+ 80+ 80-150 80-200 80-200  
Depth of Cut
 .012-.032 .020-.040 .020-.045 .020-.080 .020-.120 .020-.200  
Stepover
 .012-.020 .012-.032 .012-.032 .012-.040 .020-.060 .020-.100  

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