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Material Removal Rate (MRR) Formula:
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Material Removal Rate (MRR) is the volume of material removed per unit time during a machining operation. It's a key metric in milling that helps evaluate machining efficiency and productivity.
The calculator uses the MRR formula:
Where:
Explanation: The formula calculates the volume of material removed by multiplying the cross-sectional area of the cut (width × depth) by the linear speed of the cutter (feed rate).
Details: MRR helps in optimizing machining parameters, comparing tool performance, estimating machining time, and calculating production costs. Higher MRR generally means more efficient material removal but must be balanced against tool life and surface finish requirements.
Tips: Enter width and depth of cut in inches, and feed rate in inches per minute. All values must be positive numbers. For slot milling, width equals the cutter diameter.
Q1: What units should I use for MRR calculation?
A: This calculator uses inches for width/depth and inches per minute for feed rate, resulting in cubic inches per minute. For metric, convert to mm and mm/min.
Q2: How does MRR relate to cutting power?
A: Power required is roughly proportional to MRR. Higher MRR requires more cutting power and may need machine capability verification.
Q3: What's a typical MRR value?
A: MRR varies widely based on material, tooling, and machine. Aluminum might have MRR of 5-20 in³/min, while titanium might be 0.5-2 in³/min.
Q4: Does MRR affect tool life?
A: Yes, higher MRR generally decreases tool life due to increased heat and wear. Optimal MRR balances productivity and tool cost.
Q5: How does radial depth affect MRR?
A: MRR increases linearly with radial depth (width of cut), but practical limits exist based on tool strength and machine power.