curl --request POST \
  --url https://api.iotools.cloud/v1/tool/machining-speed-feed-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "unitSystem": "metric",
  "diameter": "10",
  "teeth": "4",
  "material": "aluminium",
  "toolMaterial": "carbide",
  "cuttingSpeed": "",
  "feedPerTooth": "",
  "depthOfCut": "5",
  "widthOfCut": "3"
}
'

{
  "tool": "machining-speed-feed-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "results": [
      {
        "metric": "Spindle speed",
        "value": "12732 RPM"
      },
      {
        "metric": "Feed rate",
        "value": "10185.9 mm/min"
      },
      {
        "metric": "Feed per revolution",
        "value": "0.8 mm/rev"
      },
      {
        "metric": "Cutting speed Vc used",
        "value": "400 m/min"
      },
      {
        "metric": "Feed per tooth fz used",
        "value": "0.2 mm/tooth"
      },
      {
        "metric": "Material removal rate",
        "value": "152.79 cm³/min"
      },
      {
        "metric": "Recommended Vc — Aluminium (6061 / 7075), carbide",
        "value": "400 m/min"
      },
      {
        "metric": "Recommended feed per tooth",
        "value": "0.2 mm/tooth (2% of diameter)"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}