{
    "slug": "material-removal-rate",
    "title": "Material Removal Rate by Spindle Power: 10 and 20 kW",
    "description": "Power-limited material removal rates for eight CNC alloys on 10 and 20 kW spindles, with the unit-power table, published benchmarks and a worked example.",
    "lang": "en",
    "tables": [
        {
            "caption": "Roughing MRR capacity at 10 and 20 kW spindle power (power-limited, calculated)",
            "columns": [
                "Material and condition",
                "K_p used (kW per cm³/s)",
                "10 kW turning (cm³/min)",
                "10 kW milling, cycle avg (cm³/min)",
                "20 kW turning (cm³/min)",
                "20 kW milling, cycle avg (cm³/min)"
            ],
            "rows": [
                {
                    "Material and condition": "Aluminum 6061-T6 (wrought, ~95 HB)",
                    "K_p used (kW per cm³/s)": "0.76–0.90",
                    "10 kW turning (cm³/min)": "425–505",
                    "10 kW milling, cycle avg (cm³/min)": "340–405",
                    "20 kW turning (cm³/min)": "850–1,010",
                    "20 kW milling, cycle avg (cm³/min)": "680–810"
                },
                {
                    "Material and condition": "Aluminum 7075-T6 (wrought, ~150 HB)",
                    "K_p used (kW per cm³/s)": "0.76–0.90",
                    "10 kW turning (cm³/min)": "425–505",
                    "10 kW milling, cycle avg (cm³/min)": "340–405",
                    "20 kW turning (cm³/min)": "850–1,010",
                    "20 kW milling, cycle avg (cm³/min)": "680–810"
                },
                {
                    "Material and condition": "Carbon steel 1045 (190–220 HB)",
                    "K_p used (kW per cm³/s)": "1.70–2.32",
                    "10 kW turning (cm³/min)": "165–225",
                    "10 kW milling, cycle avg (cm³/min)": "130–180",
                    "20 kW turning (cm³/min)": "330–450",
                    "20 kW milling, cycle avg (cm³/min)": "260–360"
                },
                {
                    "Material and condition": "Alloy steel 4140 (Q&T, 280–320 HB)",
                    "K_p used (kW per cm³/s)": "2.18–3.29",
                    "10 kW turning (cm³/min)": "115–175",
                    "10 kW milling, cycle avg (cm³/min)": "90–140",
                    "20 kW turning (cm³/min)": "230–350",
                    "20 kW milling, cycle avg (cm³/min)": "180–280"
                },
                {
                    "Material and condition": "Stainless 304 (annealed, 150–180 HB)",
                    "K_p used (kW per cm³/s)": "1.64–2.94",
                    "10 kW turning (cm³/min)": "130–235",
                    "10 kW milling, cycle avg (cm³/min)": "105–190",
                    "20 kW turning (cm³/min)": "260–470",
                    "20 kW milling, cycle avg (cm³/min)": "210–380"
                },
                {
                    "Material and condition": "Stainless 316 (annealed, 150–180 HB)",
                    "K_p used (kW per cm³/s)": "1.64–2.94",
                    "10 kW turning (cm³/min)": "130–235",
                    "10 kW milling, cycle avg (cm³/min)": "105–190",
                    "20 kW turning (cm³/min)": "260–470",
                    "20 kW milling, cycle avg (cm³/min)": "210–380"
                },
                {
                    "Material and condition": "Titanium Ti-6Al-4V (annealed, 330–350 HB)",
                    "K_p used (kW per cm³/s)": "1.65–1.77",
                    "10 kW turning (cm³/min)": "215–230",
                    "10 kW milling, cycle avg (cm³/min)": "170–185",
                    "20 kW turning (cm³/min)": "430–460",
                    "20 kW milling, cycle avg (cm³/min)": "340–370"
                },
                {
                    "Material and condition": "Brass C36000 (free-cutting, 90–120 HB)",
                    "K_p used (kW per cm³/s)": "0.82–1.90",
                    "10 kW turning (cm³/min)": "200–465",
                    "10 kW milling, cycle avg (cm³/min)": "160–370",
                    "20 kW turning (cm³/min)": "400–930",
                    "20 kW milling, cycle avg (cm³/min)": "320–740"
                }
            ]
        },
        {
            "caption": "What Metal Removal Rate Can a 10 kW CNC Machine Achieve in Aluminium?",
            "columns": [
                "Source",
                "Machine / case",
                "Material",
                "MRR (cm³/min)",
                "Note"
            ],
            "rows": [
                {
                    "Source": "S5",
                    "Machine / case": "40-taper VMC, stable roughing",
                    "Material": "Carbon steel",
                    "MRR (cm³/min)": "50–100",
                    "Note": "3–6 in³/min in the source"
                },
                {
                    "Source": "S5",
                    "Machine / case": "40-taper VMC, HSM strategy",
                    "Material": "Aluminum",
                    "MRR (cm³/min)": "245–410",
                    "Note": "15–25 in³/min in the source"
                },
                {
                    "Source": "S5",
                    "Machine / case": "50-taper / horizontal",
                    "Material": "Steel",
                    "MRR (cm³/min)": "100–200",
                    "Note": "About double the 40-taper figure"
                },
                {
                    "Source": "S6",
                    "Machine / case": "120 kW, 27,000 rpm (DST Ecospeed)",
                    "Material": "Aluminum 7050",
                    "MRR (cm³/min)": "5,160",
                    "Note": "Competitor PCD tooling, case 1"
                },
                {
                    "Source": "S6",
                    "Machine / case": "120 kW, 27,000 rpm",
                    "Material": "Aluminum 7050",
                    "MRR (cm³/min)": "7,465",
                    "Note": "RAL90 coating, same case"
                },
                {
                    "Source": "S6",
                    "Machine / case": "120 kW, 33,000 rpm (Makino MAG 3.W)",
                    "Material": "Aluminum (cutter diameter 50 mm)",
                    "MRR (cm³/min)": "7,000",
                    "Note": "420,000 cm³ removed in 60 min"
                },
                {
                    "Source": "S8",
                    "Machine / case": "Bridgeport 2 hp / HAAS 30 hp comparison",
                    "Material": "Aluminum",
                    "MRR (cm³/min)": "165",
                    "Note": "10.1 in³/min at 1.1–3.0 kW cutting power"
                }
            ]
        },
        {
            "caption": "How Much Slower Is 304 Stainless Than 6061 on the Same 10 kW Spindle?",
            "columns": [
                "Material",
                "Condition",
                "ISO",
                "Hardness (HB)",
                "K_p (kW per cm³/s)",
                "Source (low / high)"
            ],
            "rows": [
                {
                    "Material": "Aluminum 6061-T6",
                    "Condition": "wrought, T6",
                    "ISO": "N",
                    "Hardness (HB)": "~95",
                    "K_p (kW per cm³/s)": "0.76–0.90",
                    "Source (low / high)": "S4 / S3"
                },
                {
                    "Material": "Aluminum 7075-T6",
                    "Condition": "wrought, T6",
                    "ISO": "N",
                    "Hardness (HB)": "~150",
                    "K_p (kW per cm³/s)": "0.76–0.90",
                    "Source (low / high)": "S4 / S3 — take the upper end for 7075"
                },
                {
                    "Material": "Carbon steel 1045",
                    "Condition": "hot-rolled / normalized",
                    "ISO": "P",
                    "Hardness (HB)": "190–220",
                    "K_p (kW per cm³/s)": "1.70–2.32",
                    "Source (low / high)": "S2 (190 HB) / S3 (200–220 HB)"
                },
                {
                    "Material": "Alloy steel 4140",
                    "Condition": "quenched and tempered, 28–32 HRC",
                    "ISO": "P",
                    "Hardness (HB)": "280–320",
                    "K_p (kW per cm³/s)": "2.18–3.29",
                    "Source (low / high)": "S3 (280–320 HB) / S4 (220–420 HB upper bound)"
                },
                {
                    "Material": "Stainless 304",
                    "Condition": "annealed",
                    "ISO": "M",
                    "Hardness (HB)": "150–180",
                    "K_p (kW per cm³/s)": "1.64–2.94",
                    "Source (low / high)": "S3 (150–175 HB) / S4 (austenitic 150–275 HB)"
                },
                {
                    "Material": "Stainless 316",
                    "Condition": "annealed",
                    "ISO": "M",
                    "Hardness (HB)": "150–180",
                    "K_p (kW per cm³/s)": "1.64–2.94",
                    "Source (low / high)": "S3 (150–175 HB) / S4 (austenitic 150–275 HB)"
                },
                {
                    "Material": "Titanium Ti-6Al-4V",
                    "Condition": "annealed",
                    "ISO": "S",
                    "Hardness (HB)": "330–350",
                    "K_p (kW per cm³/s)": "1.65–1.77",
                    "Source (low / high)": "S4 (300–360 HB) / S3 (Ti-150 A, 340 HB)"
                },
                {
                    "Material": "Brass C36000",
                    "Condition": "leaded free-machining",
                    "ISO": "N",
                    "Hardness (HB)": "90–120",
                    "K_p (kW per cm³/s)": "0.82–1.90",
                    "Source (low / high)": "S3 / S4 — see the conflict register"
                }
            ]
        },
        {
            "caption": "What MRR Should I Plan for 4140 Steel on a 10 kW Machine?",
            "columns": [
                "Material",
                "K_p (kW per cm³/s)",
                "P_c at the tool (kW)",
                "P_spindle input (kW)",
                "Load on a 10 kW spindle (%)"
            ],
            "rows": [
                {
                    "Material": "Aluminum 6061-T6",
                    "K_p (kW per cm³/s)": "0.90",
                    "P_c at the tool (kW)": "1.29",
                    "P_spindle input (kW)": "1.5",
                    "Load on a 10 kW spindle (%)": "15"
                },
                {
                    "Material": "Carbon steel 1045",
                    "K_p (kW per cm³/s)": "2.32",
                    "P_c at the tool (kW)": "3.33",
                    "P_spindle input (kW)": "3.9",
                    "Load on a 10 kW spindle (%)": "39"
                },
                {
                    "Material": "Alloy steel 4140",
                    "K_p (kW per cm³/s)": "3.29",
                    "P_c at the tool (kW)": "4.72",
                    "P_spindle input (kW)": "5.6",
                    "Load on a 10 kW spindle (%)": "55"
                },
                {
                    "Material": "Stainless 304",
                    "K_p (kW per cm³/s)": "2.94",
                    "P_c at the tool (kW)": "4.21",
                    "P_spindle input (kW)": "5.0",
                    "Load on a 10 kW spindle (%)": "50"
                },
                {
                    "Material": "Titanium Ti-6Al-4V",
                    "K_p (kW per cm³/s)": "1.77",
                    "P_c at the tool (kW)": "2.54",
                    "P_spindle input (kW)": "3.0",
                    "Load on a 10 kW spindle (%)": "30"
                },
                {
                    "Material": "Brass C36000",
                    "K_p (kW per cm³/s)": "1.90",
                    "P_c at the tool (kW)": "2.72",
                    "P_spindle input (kW)": "3.2",
                    "Load on a 10 kW spindle (%)": "32"
                }
            ]
        },
        {
            "caption": "Is Titanium Roughing Limited by Spindle Power?",
            "columns": [
                "Item",
                "Value",
                "How to read it"
            ],
            "rows": [
                {
                    "Item": "K_p (unit power)",
                    "Value": "1.65–1.77 kW per cm³/s",
                    "How to read it": "Below 4140 — the spindle is not the bottleneck"
                },
                {
                    "Item": "10 kW turning ceiling",
                    "Value": "215–230 cm³/min",
                    "How to read it": "Power allows more than shops typically run"
                },
                {
                    "Item": "10 kW milling ceiling, cycle avg",
                    "Value": "170–185 cm³/min",
                    "How to read it": "Cycle average at the 80% in-cut factor"
                },
                {
                    "Item": "20 kW turning ceiling",
                    "Value": "430–460 cm³/min",
                    "How to read it": "Doubles the ceiling, not the allowable cut"
                },
                {
                    "Item": "Actual limiter",
                    "Value": "Heat and tool life",
                    "How to read it": "Run the cutting-parameters speeds with high-pressure coolant — the coolant is a precondition, not an option"
                }
            ]
        },
        {
            "caption": "Does a 20 kW Spindle Double My Removal Rate?",
            "columns": [
                "Parameter",
                "Ø12 cutter (worked example)",
                "Ø20 cutter (illustrative)"
            ],
            "rows": [
                {
                    "Parameter": "Tool",
                    "Ø12 cutter (worked example)": "Ø12 mm, 3-flute carbide end mill",
                    "Ø20 cutter (illustrative)": "Ø20 mm — an example, not a recommendation"
                },
                {
                    "Parameter": "Radial width a_e (mm)",
                    "Ø12 cutter (worked example)": "6",
                    "Ø20 cutter (illustrative)": "10"
                },
                {
                    "Parameter": "Axial depth a_p (mm)",
                    "Ø12 cutter (worked example)": "6",
                    "Ø20 cutter (illustrative)": "10"
                },
                {
                    "Parameter": "Feed speed V_f (mm/min)",
                    "Ø12 cutter (worked example)": "2,388",
                    "Ø20 cutter (illustrative)": "2,000"
                },
                {
                    "Parameter": "MRR (cm³/min)",
                    "Ø12 cutter (worked example)": "86",
                    "Ø20 cutter (illustrative)": "200"
                },
                {
                    "Parameter": "Cutting time for 25 cm³",
                    "Ø12 cutter (worked example)": "17.5 s",
                    "Ø20 cutter (illustrative)": "7.5 s"
                }
            ]
        },
        {
            "caption": "Why Is Milling MRR Lower Than Turning on the Same Machine?",
            "columns": [
                "Step",
                "Rule",
                "6061-T6, 10 kW"
            ],
            "rows": [
                {
                    "Step": "1",
                    "Rule": "Turning ceiling: Q_max = 60 × 10 × 0.6375 / K_p, rounded to 5 cm³/min",
                    "6061-T6, 10 kW": "425–505"
                },
                {
                    "Step": "2",
                    "Rule": "Milling column = 0.8 × the rounded turning column, rounded to 5 cm³/min",
                    "6061-T6, 10 kW": "340–405"
                },
                {
                    "Step": "3",
                    "Rule": "20 kW columns = 2 × the 10 kW columns (exact doubling)",
                    "6061-T6, 10 kW": "850–1,010 turning / 680–810 milling"
                }
            ]
        },
        {
            "caption": "What Spindle Load Should I Target When Roughing?",
            "columns": [
                "Parameter",
                "Value",
                "Basis"
            ],
            "rows": [
                {
                    "Parameter": "Rated spindle power P_rated",
                    "Value": "10 / 20 kW",
                    "Basis": "The two common VMC power classes"
                },
                {
                    "Parameter": "Drive efficiency η",
                    "Value": "0.85",
                    "Basis": "Planning assumption, not a measurement — confirm against the machine tool builder data"
                },
                {
                    "Parameter": "Roughing load factor L",
                    "Value": "0.75",
                    "Basis": "Midpoint of the 70–85% target band (S5)"
                },
                {
                    "Parameter": "Usable cutting-power factor",
                    "Value": "0.85 × 0.75 = 0.6375 ≈ 0.64",
                    "Basis": "Only 0.64 kW of each rated kW reaches the chip"
                },
                {
                    "Parameter": "Tool condition",
                    "Value": "Sharp carbide",
                    "Basis": "The K_p tables are compiled for sharp cutting tools"
                },
                {
                    "Parameter": "Milling in-cut factor",
                    "Value": "0.80",
                    "Basis": "S5 worked example: 80% of the cycle in cut"
                },
                {
                    "Parameter": "Coolant and setup",
                    "Value": "Stable, no chatter",
                    "Basis": "Steel and stainless flood emulsion; titanium high-pressure coolant; aluminum flood or MQL"
                }
            ]
        },
        {
            "caption": "What Is the MRR Formula for Milling and Turning?",
            "columns": [
                "Step",
                "Quantity",
                "Value"
            ],
            "rows": [
                {
                    "Step": "1",
                    "Quantity": "Removal volume V",
                    "Value": "50 × 50 × 10 mm pocket = 25 cm³"
                },
                {
                    "Step": "2",
                    "Quantity": "Tool and engagement",
                    "Value": "Ø12 mm, 3-flute carbide end mill; V_c 300 m/min; f_z 0.10 mm/tooth; a_e = a_p = 6 mm"
                },
                {
                    "Step": "3",
                    "Quantity": "Spindle speed n = 1,000 × V_c / (π × D)",
                    "Value": "7,958 → take 7,960 rpm"
                },
                {
                    "Step": "4",
                    "Quantity": "Feed speed V_f = n × z × f_z",
                    "Value": "7,960 × 3 × 0.10 = 2,388 mm/min"
                },
                {
                    "Step": "5",
                    "Quantity": "MRR Q = a_e × a_p × V_f / 1,000",
                    "Value": "6 × 6 × 2,388 / 1,000 = 85.97 → 86 cm³/min"
                },
                {
                    "Step": "6",
                    "Quantity": "Cutting time T = V / Q",
                    "Value": "25 / 86 = 0.291 min = 17.5 s (21.8 s with 20% non-cutting)"
                },
                {
                    "Step": "7",
                    "Quantity": "Power check P_c = K_p × Q, spindle input P_c / 0.85",
                    "Value": "0.90 × 1.433 = 1.29 kW → 1.52 kW → 15.2% of 10 kW"
                },
                {
                    "Step": "8",
                    "Quantity": "Reading",
                    "Value": "Spindle only 15% loaded — the Ø12 cutter in a 50 mm pocket is tool-limited; the 425 cm³/min ceiling would need V_f 11,806 mm/min, five times beyond this cutter"
                }
            ]
        },
        {
            "caption": "How Do I Convert MRR to Machining Time?",
            "columns": [
                "Rate case",
                "Q (cm³/min)",
                "Time for 25 cm³ (s)"
            ],
            "rows": [
                {
                    "Rate case": "Worked example toolpath (Ø12 in 6061)",
                    "Q (cm³/min)": "86",
                    "Time for 25 cm³ (s)": "17.5"
                },
                {
                    "Rate case": "Ø20 cutter example",
                    "Q (cm³/min)": "200",
                    "Time for 25 cm³ (s)": "7.5"
                },
                {
                    "Rate case": "6061 10 kW turning ceiling",
                    "Q (cm³/min)": "425",
                    "Time for 25 cm³ (s)": "3.5"
                },
                {
                    "Rate case": "304 planning low end",
                    "Q (cm³/min)": "130",
                    "Time for 25 cm³ (s)": "11.5"
                },
                {
                    "Rate case": "4140 milling planning low end",
                    "Q (cm³/min)": "90",
                    "Time for 25 cm³ (s)": "16.7"
                }
            ]
        },
        {
            "caption": "How Accurate Are These MRR Numbers for Quoting?",
            "columns": [
                "Conflict",
                "Source A",
                "Source B",
                "Handling on this page"
            ],
            "rows": [
                {
                    "Conflict": "304 / 316 unit power",
                    "Source A": "S3 handbook band 1.64–1.97 (150–200 HB, sharp tools)",
                    "Source B": "S4 energy-study value 2.94 (austenitic 150–275 HB)",
                    "Handling on this page": "The full 1.64–2.94 band stays in the tables; quote from the 130 cm³/min low end unless hardness and tools are confirmed at the favorable end"
                },
                {
                    "Conflict": "C36000 unit power",
                    "Source A": "S3 leaded brass 0.82",
                    "Source B": "S4 leaded brass 1.90",
                    "Handling on this page": "0.82 matches brass physics (K_p ≈ k_c / 1,000, k_c ≈ 800 N/mm²), so prefer the 0.82 end; the 200–465 band stays as the registered envelope"
                },
                {
                    "Conflict": "1045 / 4140 ranges",
                    "Source A": "S3 by 20 HB steps",
                    "Source B": "S4 220–420 HB envelope",
                    "Handling on this page": "Not a conflict — the range tracks hardness; do not describe it as sources disagreeing"
                }
            ]
        }
    ]
}