industrial-product-design-gbt

Industrial Product Design with GB/T Handoff

Treat product design as the primary task and mechanical drafting as the engineering expression of a sufficiently resolved design. Decide who the product serves, what it must do, how it is used, why it has its form, and how it will be made and verified before detailed CAD and drawings.

Core Principles

• Converge function, architecture, interaction, form, CMF, manufacturing, service, and safety together. Do not apply styling as a late shell over an unresolved package.
• Separate observation, inference, assumption, and confirmed requirement. Mark unknown inputs TBD and checks that did not run NOT_EVALUATED.
• Create meaningful alternatives. Color or fillet variants of the first idea do not count as concept exploration.
• Express aesthetics as testable form language: proportion, silhouette, mass hierarchy, geometry vocabulary, line and surface relationships, transitions, boundaries, detail density, CMF, and 360-degree coherence.
• Keep editable parametric native CAD as engineering truth. Renders, meshes, images, plots, and exchange files are derived evidence.
• Never infer manufacturing-critical dimensions, material performance, tolerances, safety distances, or compliance from appearance alone.
• Lock the product's immutable design DNA before optimization. Do not solve usability, packaging, cost, or engineering pressure by silently deleting the defining innovation.
• Label every output by maturity. A concept is not a manufacturable design, and automated checks do not grant release approval.
• Never treat body count, entity count, dimension audit, geometry DRC, or save success as proof that proportion, form language, interface integration, motion logic, surface quality, or product realism is acceptable.

Portability Contract

• Discover the available CAD application, automation bridge, renderers, parsers, and file formats before execution. Map capability-level steps to tools that actually exist.
• Never invent a tool call or verification result. After mutable CAD operations, read back actual entities, parameters, associations, hierarchy, and geometry.
• Preserve the user's source and unrelated geometry. Use a traceable working copy for major revisions; do not overwrite, remove, or replace user files without authority.
• Keep deliverables and evidence in standard CAD, exchange, image, and report artifacts that another tool or reviewer can reopen.