{
  "slug": "chip-load-calculator",
  "title": "Chip Load Calculator",
  "heading": "Chip Load Calculator",
  "category": "other",
  "url": "https://www.revenuelab.fyi/toolbox/chip-load-calculator",
  "summary": "Back-calculate chip load per tooth from your actual feed rate and RPM.",
  "description": "Chip load per tooth is the thickness of material each cutting edge removes on a single pass, and it's the single most important number for tool life and finish quality. This calculator runs the reverse direction from a typical feeds-and-speeds chart: instead of looking up chip load and calculating feed rate, you plug in the feed rate and RPM you're already running (or considering) and it tells you the actual chip load per tooth, so you can compare it against manufacturer recommendations. This is useful when troubleshooting — if a tool is failing prematurely or you're seeing poor surface finish, checking the actual chip load against spec often reveals the problem is too light a chip load (causing rubbing and work hardening, especially in stainless and titanium) rather than too heavy. Undersized chip load is a more common real-world problem than oversized, particularly on older machines running conservative programs.",
  "formula": "Chip Load per Tooth = Feed Rate (ipm) ÷ (RPM × Number of Flutes).",
  "dateModified": "2026-09-30",
  "run_url": "https://www.revenuelab.fyi/api/public/calc?tool=chip-load-calculator",
  "inputs": [
    {
      "id": "feedRate",
      "label": "Feed rate",
      "kind": "number",
      "hint": null,
      "default": 42,
      "unit": "ipm",
      "min": 0.1,
      "max": null
    },
    {
      "id": "rpm",
      "label": "Spindle speed",
      "kind": "number",
      "hint": null,
      "default": 5500,
      "unit": "RPM",
      "min": 1,
      "max": null
    },
    {
      "id": "flutes",
      "label": "Number of flutes",
      "kind": "number",
      "hint": null,
      "default": 3,
      "unit": null,
      "min": 1,
      "max": 12
    },
    {
      "id": "recommended",
      "label": "Manufacturer-recommended chip load",
      "kind": "number",
      "hint": null,
      "default": 0.003,
      "unit": "in",
      "min": 0,
      "max": null
    }
  ],
  "outputs": [
    {
      "id": "chipLoad",
      "label": "Actual chip load per tooth",
      "format": "decimal",
      "hint": null,
      "primary": true
    },
    {
      "id": "ratio",
      "label": "% of recommended chip load",
      "format": "percent",
      "hint": null,
      "primary": false
    },
    {
      "id": "deltaPct",
      "label": "Deviation from recommended",
      "format": "percent",
      "hint": null,
      "primary": false
    }
  ],
  "worked_example": {
    "inputs": [
      "Feed rate: 42 ipm",
      "Spindle speed: 5500 RPM",
      "Number of flutes: 3",
      "Manufacturer-recommended chip load: 0.003 in"
    ],
    "outputs": [
      "Actual chip load per tooth: 0.00255",
      "% of recommended chip load: 85%",
      "Deviation from recommended: -15%"
    ]
  },
  "how_to": {
    "title": "How to use this",
    "steps": [
      "Enter feed rate (ipm).",
      "Enter spindle speed (RPM).",
      "Enter number of flutes.",
      "Enter manufacturer-recommended chip load (in).",
      "Read your actual chip load per tooth on the right — it updates as you type.",
      "Hit Share to keep the scenario or send it to someone."
    ]
  },
  "scenarios": [
    {
      "name": "Conservative",
      "description": "Lower-end numbers — what if things land soft?",
      "values": {
        "feedRate": 25,
        "rpm": 3300,
        "flutes": 2,
        "recommended": 0.0018
      }
    },
    {
      "name": "Typical",
      "description": "Defaults — the most common real-world setup.",
      "values": {
        "feedRate": 42,
        "rpm": 5500,
        "flutes": 3,
        "recommended": 0.003
      }
    },
    {
      "name": "Ambitious",
      "description": "Higher-end numbers — what if things really pop?",
      "values": {
        "feedRate": 67,
        "rpm": 8800,
        "flutes": 5,
        "recommended": 0.0048000000000000004
      }
    }
  ],
  "limitations": [
    "Estimates assume standard, average conditions — local rules, pricing, and materials vary.",
    "Results are rounded for readability; add a buffer before ordering, booking, or committing.",
    "Double-check anything with a real cost attached against a local quote."
  ],
  "faq": [
    {
      "q": "What if my chip load is way below recommended?",
      "a": "You're likely rubbing rather than cutting cleanly, which generates heat and work-hardens the surface — a big problem in stainless and Inconel. The fix is usually to increase feed rate, not decrease RPM, since RPM change also shifts your cutting speed away from the ideal SFM for the material."
    },
    {
      "q": "What if chip load is too high?",
      "a": "Expect chatter, poor finish, and premature edge chipping, especially on smaller-diameter or longer tools with more deflection. Reduce feed rate or step down to a smaller depth of cut to compensate rather than dropping RPM."
    },
    {
      "q": "Does this apply to drilling too?",
      "a": "Yes, with flutes typically at 2 for standard twist drills. Drilling chip load recommendations tend to run higher than milling for the same diameter because the cutting geometry and chip evacuation are different."
    },
    {
      "q": "Why do finishing passes use lighter chip loads than roughing?",
      "a": "Finishing prioritizes surface quality and dimensional accuracy over material removal rate, so shops typically run 30-50% of the roughing chip load on a finish pass, trading cycle time for a better surface finish and tighter tolerance."
    }
  ],
  "related": [
    "https://www.revenuelab.fyi/toolbox/cnc-feeds-and-speeds",
    "https://www.revenuelab.fyi/toolbox/material-removal-rate"
  ],
  "license": "CC-BY-4.0",
  "citation": "RevenueLab — Chip Load Calculator (https://www.revenuelab.fyi/toolbox/chip-load-calculator)"
}