A CNC handoff succeeds when another operator can identify the units, origin, geometry revision, tool list, stock, post-processor, and verification state without asking the file creator. Treat the package as a manufacturing record, not a loose export.
Use CNC Router Terms Beginners Need Before Their First Setup for the broader workflow. The adjacent task is covered in Before Your First CNC Project, Check the File, Zero, Clamps, and Dry Run and Planning a CNC Workshop Around Space, Power, Dust, and Safety.
Define the Handoff Package and Owner
State who supplies the editable source, who creates CAM, who selects the tool, and who approves machine-ready output. The package should identify the revision, stock, finished dimensions, critical features, target machine, and any surfaces or orientations that must not change.
Confirm Units, Scale, and One Known Dimension
Do not rely on the canvas size or an import dialog. Record the intended units and compare at least one known physical dimension after every conversion. If the source lacks reliable units, stop the handoff and obtain a dimensioned reference before toolpaths are created.
Release Geometry Before Releasing Toolpaths
Inspect open contours, duplicate paths, self-intersections, curve quality, tiny segments, missing layers, mirrored geometry, mesh defects, and minimum feature size. Save the corrected geometry as a controlled revision so CAM is not rebuilt from a different copy later.
Match CAM, Tool Data, and the Post-Processor
The CAM package must name the stock, datum, tool identity, cutting geometry, tool projection, operation order, clearances, and target post-processor. Verify that units, arcs, spindle commands, tool changes, and controller dialect match the actual machine rather than a generic profile.
Rebuild the Physical Setup From the Handoff Record
At the machine, verify stock orientation, fixture, clamp and rapid clearance, work origin, tool, spindle state, and machine envelope. Preview the boundary and first moves above the work. A correct file can still fail when the physical datum or tool does not match the recorded setup.
Archive the Released Job and Its Proof
Store the approved source, CAM project, posted file, software and post versions, setup sheet, inspection result, and accepted sample or measurement record together. If any upstream item changes, issue a new revision and repeat the dependent checks instead of overwriting the released package.
CNC File Handoff Pass/Fail Checklist
| Check | Required evidence | Owner | Pass/Fail |
|---|---|---|---|
| Editable source | Current source file and revision | Designer | ________________ |
| Units | mm or inch confirmed | Designer | ________________ |
| Known dimension | Measured reference matches | Reviewer | ________________ |
| Closed geometry | Geometry inspection passed | CAM operator | ________________ |
| Stock definition | Material, size, and thickness | CAM operator | ________________ |
| Post-processor | Exact controller profile | CAM operator | ________________ |
| Work origin | Setup drawing and datum | Operator | ________________ |
| First rapid | Previewed above the work | Operator | ________________ |
| Released revision | Approved package archived | Approver | ________________ |
