Prepared from parser behavior, machining-file examples and visual checks performed in CNC Viewer. Always confirm the result against the CAM setup and machine documentation before production.
2D verification
Reading CNC technical drawings and hole dimensions
A technical drawing is most useful when it reduces the 3D result to dimensions that can be checked. It should preserve the machined outline and operation positions without burying the part under repeated labels.
Start with the finished outline and overall size
The outside profile should represent the remaining part boundary after valid contour machining, including edge notches. A separate stock rectangle can be useful for comparison, but it must be visually distinct and should not be mistaken for a second finished contour.
Overall width, height and thickness establish the drawing scale. If those values disagree with the source stock declaration, operation dimensions should not be trusted until units and coordinate transformations are corrected.
Dimension holes from stable references
A vertical hole needs center X and Y, diameter, depth and working face. Edge holes additionally need entry side and center height. Dimensions should originate from the finished reference edges used by the manufacturing drawing, not from the outer edge of a red selection marker.
When no operation is selected, a general drawing can show key dimensions. After selection, hiding unrelated dimensions and emphasizing only the chosen feature keeps labels legible near panel edges.
Channels need width, depth and endpoints
A channel centerline alone does not describe the cut. The drawing should pair it with the physical width and depth obtained from the operation or assigned tool. For an open channel, start and end positions are meaningful; for a pocket-clearing path, the final removed boundary can be more useful than every internal pass.
G-code relief programs can contain thousands of neighboring paths. Rendering all of them as independent vector layers makes pan and zoom slow. A combined displacement image is more appropriate for the machined surface, while selected paths can remain vector overlays for inspection.
Notch dimensions describe removed geometry
An edge notch is measured by its opening along the original edge and its inward depth. The horizontal dimension belongs across the removed opening, while the depth arrow runs from the original edge toward the innermost notch segment. Placing either value inside the retained tab reverses the meaning.
Wheel zoom should preserve dimension proportions, and middle-button panning should move the sheet without changing the selected feature. Labels are screen-space annotations: they need a top drawing layer so edge values are never hidden behind the panel fill.
- Overall dimensions are visible first
- Selected feature labels stay on top
- Notch width spans the opening
- Notch depth points inward