Material Removal Rate Calculator
Calculate the volumetric material removal rate (MRR) in a milling operation.
Material Removal Rate
24.00 cm^3/min
Material Removal Rate vs Table Feed Rate (Vf)
Formula
## Material Removal Rate in Milling MRR quantifies how fast material is being removed, which directly relates to productivity and power consumption. ### Formula **MRR = ap x ae x Vf** where ap is the axial depth of cut, ae is the radial width of cut, and Vf is the table feed rate. The result in mm^3/min can be divided by 1000 for cm^3/min.
Exemplo Resolvido
Milling with 3 mm depth, 20 mm width, at 400 mm/min feed.
- 01MRR = 3 x 20 x 400 = 24,000 mm^3/min
- 02MRR = 24,000 / 1000 = 24 cm^3/min
- 03For steel with specific cutting energy of 2.5 W-s/mm^3, power = 24000/60 x 2.5 = 1000 W = 1 kW at spindle.
Perguntas Frequentes
How is MRR related to machining power?
Spindle power = MRR x specific cutting energy (kc). For mild steel kc is about 2.0-2.5 W-s/mm^3, aluminium about 0.7-1.0, cast iron about 1.2-1.5. This helps verify the machine has sufficient power.
What limits the maximum MRR?
Machine spindle power, tool strength, rigidity of the setup, and required surface finish all limit MRR. Higher MRR generally means rougher surface finish and higher forces.
Is higher MRR always better?
Higher MRR improves productivity, but it must be balanced against tool life, surface quality, dimensional accuracy, and machine capabilities. Roughing passes maximise MRR; finishing passes prioritise precision.
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