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First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com

Answer 12 · Act 47 · Transact 1 · Score: Not yet scored

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cad.add_mechanical_joint

act imperative

Mate two parts face-to-face and generate a paired mechanical interface (currently pin hinge). The moving part is aligned to the host, then hinge/barrel geometry is added to both.

Page: /editor

Input schema

Property	Type	Required	Description
`targetPartId`	string	no	Stable ID of the moving part to align to the host.
`referencePartId`	string	yes	Fixed host part.
`face`	string	yes	Face on the moving part that contacts the host.
`referenceFace`	string	yes	Face on the host that contacts the moving part.
`targetFace`	string	no	Legacy alias for referenceFace.
`mechanicalJointKind`	string	no	Interface kind. Only pinHinge is committable.
`jointId`	string	no	Opaque joint id used by generated geometry.
`hostPartId`	string	no	Legacy alias for referencePartId.
`type`	string	no	Legacy alias for mechanicalJointKind.
`sizeMm`	number	no	Legacy joint diameter/size.
`hostComponentId`	string	no	Opaque host component id.
`targetComponentId`	string	no	Opaque moving component id.
`parameters`	object	no	Optional joint parameters (pin diameter, barrel length, etc.).
`manufacturingProcess`	string	no	Process used for clearances.
`fit`	string	no	Fit class.

Raw JSON schema

{
  "type": "object",
  "title": "add mechanical joint",
  "description": "Arguments for add_mechanical_joint.",
  "properties": {
    "targetPartId": {
      "type": "string",
      "description": "Stable ID of the moving part to align to the host."
    },
    "referencePartId": {
      "type": "string",
      "description": "Fixed host part."
    },
    "face": {
      "type": "string",
      "description": "Face on the moving part that contacts the host."
    },
    "referenceFace": {
      "type": "string",
      "description": "Face on the host that contacts the moving part."
    },
    "targetFace": {
      "type": "string",
      "description": "Legacy alias for referenceFace."
    },
    "mechanicalJointKind": {
      "type": "string",
      "description": "Interface kind. Only pinHinge is committable.",
      "enum": [
        "pinHinge"
      ],
      "default": "pinHinge"
    },
    "jointId": {
      "type": "string",
      "description": "Opaque joint id used by generated geometry."
    },
    "hostPartId": {
      "type": "string",
      "description": "Legacy alias for referencePartId."
    },
    "type": {
      "type": "string",
      "description": "Legacy alias for mechanicalJointKind."
    },
    "sizeMm": {
      "type": "number",
      "description": "Legacy joint diameter/size."
    },
    "hostComponentId": {
      "type": "string",
      "description": "Opaque host component id."
    },
    "targetComponentId": {
      "type": "string",
      "description": "Opaque moving component id."
    },
    "parameters": {
      "type": "object",
      "description": "Optional joint parameters (pin diameter, barrel length, etc.).",
      "default": {},
      "additionalProperties": true
    },
    "manufacturingProcess": {
      "type": "string",
      "description": "Process used for clearances.",
      "enum": [
        "fdm",
        "sla",
        "sls",
        "cnc",
        "injection_molding"
      ],
      "default": "fdm"
    },
    "fit": {
      "type": "string",
      "description": "Fit class.",
      "enum": [
        "tight",
        "normal",
        "loose"
      ],
      "default": "normal"
    }
  },
  "required": [
    "referencePartId",
    "face",
    "referenceFace"
  ],
  "additionalProperties": false
}