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Feed Rate Calculator

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When milling or drilling, or creating a tool path for a CNC machine the feed rate must be determined.  Materials have rated surface speeds for a given type of cutter.  The harder the material the slower the speed. Given the diameter of the tool and the surface speed, the RPMs of the spindle can be calculated.  Then if the tooth load for the cutter is know, and the number of teeth, the feed rate can be determined.

 

Milling Speeds (HSS End Mills)
Material	Average Tool Speed (S.F.M)
Magnesium	300
Aluminum, 7075	300
Aluminum, 6061	280
Aluminum, 2024	200
Aluminum, Cast	134
Brass	400
Bronze	150
Copper	100
Cast Iron (soft)	80
Cast Iron (hard)	50
Mild Steel	90
Cast Steel	80
Alloy Steels (hard)	40
Tool Steel	50
Stainless Steel	60
Titanium	50
High Manganese Steel	30

S.F.M. is surface feet per min.

 

TOOL FEED (in/tooth)
Material	End Mills
Magnesium	0.005 - 0.010
Aluminum	0.005 - 0.010
Brass and Bronze	0.005 - 0.010
Copper	0.004 - 0.008
Cast Iron (soft)	0.004 - 0.008
Cast Iron (hard)	0.002 - 0.006
Mild Steel	0.002 - 0.010
Cast Steel	0.002 - 0.006
Alloy Steels (hard)	0.002 - 0.006
Tool Steel	0.002 - 0.006
Stainless Steel	0.002 - 0.006
Titanium	0.002 - 0.006
High Manganese Steel	0.002 - 0.006

Design Equations:

RPM= 3.82*Surface_Speed/Cutter_Diameter

F_m = F_t x Num_Teeth x RPM, where F_t is feed/tooth, and F_m feed rate.

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