Controlling model and drawing
File type and revision hierarchy
Features, datums and inspection notes
CNC and composite handoff
Engineering record
Component context
Core & geometry
Process & review
Define the controlling geometry
A project may include a STEP or STP model, an STL reference, a DXF profile, a DWG drawing and a PDF note set. The submission should identify which file controls the geometry and revision, which documents are reference-only and how conflicts are resolved. This is more important than simply attaching multiple formats to an RFQ.
Use drawing notes to explain the component intent
Models describe shapes, but they may not state datum references, critical features, visible surfaces, local interfaces, required finish or inspection expectations. Pair the model with the notes that explain how the core will meet a mould, laminate, attachment or assembly operation. This lets the machining review preserve functional intent.
Prepare the handoff to manufacturing
State material direction if known, core form, thickness, quantity, feature purpose, process context and packing requirements. A useful file package supports CAD review, machining sequence and a protected handoff into the next composite operation.
Related questions
Questions that make the next engineering conversation more useful.
01Is STEP or STP preferred for complex PMI foam geometry?
A stable 3D solid model is often useful for complex geometry, but the controlling file and drawing notes must be identified for the project.
02Can DXF and PDF be used for PMI foam machining?
Yes, especially for 2D profiles and notes, provided the geometry reference, dimensions and revision are clear.