PFB Finishing Ball End Mill
Effective Cutting Diameter Depth of Cut Aa ØDc ØDc
Effective Cutting Diameter (ØDe)
ØDc ØDc (inch) (mm) 0.250” 6mm 0.275" 7mm 0.315" 8 mm 0.375" 10 mm 0.500" 12 mm 0.625" 16 mm 0.750" 20 mm 1.000" 25 mm 1.181" 30 mm 1.250" 32mm 0.004 0.1 0.063 1.5 0.063 1.6 0.071 1.8 0.077 2.0 0.089 2.2 0.100 2.5 0.109 2.8 0.126 3.2 0.137 3.5 0.142 3.6 0.008 0.2 0.088 2.2 0.091 2.3 0.099 2.5 0.108 2.8 0.125 3.1 0.141 3.6 0.154 4.0 0.178 4.5 0.194 4.9 0.197 5.0 0.012 0.3 0.107 2.6 0.110 2.8 0.121 3.0 0.132 3.4 0.153 3.7 0.172 4.3 0.188 4.9 0.218 5.4 0.237 6.0 0.244 6.2 0.016 0.4 0.122 3.0 0.130 3.3 0.138 3.5 0.152 3.9 0.176 4.3 0.197 5.0 0.217 5.6 0.251 6.3 0.273 6.9 0.280 7.1 0.020 0.5 0.136 3.3 0.142 3.6 0.154 3.9 0.169 4.4 0.196 4.8 0.220 5.6 0.242 6.2 0.280 7.0 0.305 7.7 0.311 7.9 0.031 0.8 0.165 4.1 0.177 4.5 0.188 4.8 0.207 5.4 0.241 6.0 0.271 7.0 0.299 7.8 0.347 8.8 0.378 9.7 0.394 10.0 0.039 1.0 - - - - - - 0.229 6.0 0.268 6.6 0.302 7.7 0.333 8.7 0.387 9.8 0.422 10.8 0.437 11.1 0.059 1.5 - - - - - - 0.273 7.1 0.323 7.9 0.365 9.3 0.404 10.5 0.471 11.9 0.515 13.1 0.531 13.5 0.079 2.0 - - - - - - - - 0.365 8.9 0.415 10.6 0.460 12.0 0.539 13.6 0.590 15.0 0.610 15.5 0.098 2.5 - - - - - - - - - - 0.455 11.6 0.506 13.2 0.595 15.0 0.652 16.6 0.677 17.2 0.118 3.0 - - - - - - - - - - - - 0.546 14.3 0.645 16.2 0.708 18.0 0.736 18.7 0.138 3.5 - - - - - - - - - - - - 0.581 15.2 0.690 17.3 0.759 19.3 0.787 20.0 0.157 4.0 - - - - - - - - - - - - - - 0.728 18.3 0.802 20.4 0.835 21.2 0.117 4.5 - - - - - - - - - - - - - - - - 0.706 21.4 0.874 22.2 0.197 5.0 - - - - - - - - - - - - - - - - 0.881 22.3 0.913 23.2 Note: Effective cutting diameter is based on cutting depth (Aa) ØDc ØDc ØDc ØDc ØDc ØDc
ØDc
How to determine effective cutting diameter:
Ex: Dc = 0.500” Aa = 0.020”
De=2 a a (D c -a a )
De = 2√0.020(0.500-0.020) De = 0.196”
ØDe
Recommended Width of Cut & Surface Roughness
Surface Finish h
Width of Cut Ar
Tool Dia ØDc
(inch) (mm) (inch) (mm) (mm) 0.250 6 0.0157 0.4 0.00027 0.007 0.275 7 0.0177 0.45 0.00027 0.007 0.315 8 0.0197 0.5 0.00031 0.008 0.375 10 0.0236 0.6 0.00037 0.009 0.500 12 0.0275 0.7 0.00038 0.010 0.625 16 0.0315 0.8 0.00040 0.010 0.750 20 0.0394 1.0 0.00052 0.012 1.000 25 0.0472 1.2 0.00055 0.014 1.181 30 0.0512 1.3 0.00055 0.014 1.250 32 0.0551 1.4 0.00059 0.015 (inch)
Aa
Ar
Ar
Ar
Dc=20mm Ar=1mm ->h=0.0125mm
Width of Cut, Ar (mm)
Width of Cut, Ar
Theoretical Cusp Height
PFB-BR Barrel Type Tool
Cusp Height and Pitch
0.020 0.018 0.016 0.014 0.012 0.010 0.008 0.006 0.004 0.002 0
（mm）
Pitch
DC
φ10 R15 φ12 R18 φ16 R24 φ20 R30 φ25 R37.5 φ32 R48
PFB-LZ Lens Type Tool
0.5
1
1.5
2
3
2.5
（mm）
Pitch
DC
h = 0.5 × ( 2×RE2- (2×RE2) 2 - P 2 ) h: Cusp Height P:Pitch RE2: Peripheral Edge R
Pitch
osgtool.com
1543
End Mill Technical
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