HSM Guide Speed & Feed Recommendations for 3-D Machining with OSG Ball End Mills
For Long LDR (6:1 to 8:1) Speeds
Roughing & Semi-finishing
Finishing
Diameter
RPM
RPM
30 - 40 HRC 28,800 – 45,000 19,800 – 31,500 16,200 – 23,400 14,400 – 21,600 11,250 – 14,832 9,090 – 12,600 8,550 – 11,925 7,920 – 10,890 7,110 – 9,360 6,210 – 8,190
40 - 50 HRC 24,000 – 37,500 16,500 – 26,250 13,500 – 19,500 12,000 – 18,000 9,375 – 12,360 7,575 – 10,500 6,900 – 9,845 6,600 – 9,075 5,925 – 7,800 5,175 – 6,825
50 - 60 HRC 18,450 – 30,000 12,450 – 21,000 10,050 – 15,600 8,850 – 14,400 6,750 – 9,888 5,310 – 8,400 4,770 – 7,950 4,530 – 7,260 3,990 – 6,240 3,390 – 5,460
30 - 40 HRC 15,000 – 37,500 15,000 – 37,500 15,000 – 37,500 15,000 – 37,500 15,000 – 25,500 13,500 – 18,300 10,950 – 14,250 9,000 – 12,150 7,500 – 10,425 6,825 – 9,150
40 - 50 HRC 15,000 – 37,500 15,000 – 37,500 15,000 – 37,500 15,000 – 28,500 15,000 – 19,500 11,250 – 13,500 9,000 – 10,500 7,500 – 9,000 6,525 – 7,800 5,850 – 7,350
50 - 60 HRC 15,000 – 37,500 15,000 – 37,500 15,000 – 37,500 15,000 – 22,875 12,000 – 15,225 9,000 – 11,250 7,275 – 9,000 6,075 – 7,500 5,175 – 6,525 4,575 – 5,700
1/32 1/16 3/32
1/8
3/16
1/4
5/16
3/8
7/16
1/2
Chip Load per Tooth
30 - 40 HRC
40 - 50 HRC
50 - 60 HRC
Diameter
Rough & Semi 0.0005 – 0.0008 0.0009 – 0.0012 0.0015 – 0.0019 0.0019 – 0.0023 0.0026 – 0.0032 0.0038 – 0.0045 0.0047 – 0.0053 0.0053 – 0.0060 0.0060 – 0.0065 0.0065 – 0.0075
Finishing
Rough & Semi 0.0004 – 0.0005 0.0008 – 0.0011 0.0011 – 0.0017 0.0015 – 0.0020 0.0024 – 0.0031 0.0038 – 0.0043 0.0039 – 0.0050 0.0047 – 0.0058 0.0051 – 0.0063 0.0060 – 0.0069
Finishing
Rough & Semi 0.0003 – 0.0005 0.0006 – 0.0009 0.0009 – 0.0015 0.0013 – 0.0017 0.0023 – 0.0029 0.0030 – 0.0038 0.0038 – 0.0047 0.0045 – 0.0054 0.0050 – 0.0060 0.0059 – 0.0068
Finishing
1/32 1/16 3/32
0.0004 – 0.0007 0.0008 – 0.0011 0.0011 – 0.0018 0.0014 – 0.0021 0.0024 – 0.0032 0.0030 – 0.0040 0.0040 – 0.0051 0.0047 – 0.0059 0.0051 – 0.0065 0.0060 – 0.0071
0.0005 – 0.0006 0.0008 – 0.0011 0.0011 – 0.0015 0.0014 – 0.0020 0.0023 – 0.0030 0.0030 – 0.0038 0.0039 – 0.0047 0.0041 – 0.0049 0.0045 – 0.0059 0.0053 – 0.0068
0.0003 – 0.0005 0.0005 – 0.0008 0.0008 – 0.0011 0.0011 – 0.0015 0.0017 – 0.0023 0.0029 – 0.0036 0.0035 – 0.0041 0.0038 – 0.0046 0.0040 – 0.0053 0.0047 – 0.0061
1/8
3/16
1/4
5/16
3/8
7/16
1/2
Axial Depths of Cut ( a a) 30 - 40 HRC 10% of Diameter 40 - 50 HRC 7% of Diameter 50 - 60 HRC 5% of Diameter
Radial Depths of Cut ( a r) Up to 35% of Diameter for roughing and semi-finishing operations. However, radial depths of cut for finishing operations are normally determined by the surface finish requirements specific to each application.
osgtool.com
1516
End Mill Technical
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