Reveal
Is a reveal a dimension or a feature?
It is both: geometrically it is a deliberate offset/clearance feature, and in production it functions as a controlled cosmetic dimension tied to tolerance stack-up and visual acceptance.
What makes a reveal different from ordinary clearance?
Clearance is mainly functional fit, whereas a reveal is a visible clearance designed to manage appearance, hide deviation, and define an edge line.
What should CAM programmers check before releasing a reveal-critical part?
Tool diameter, finishing allowance, cutter deflection, edge break, datum strategy, and assembly stack-up, because the visual gap is only as good as the final post-machined position of the edge.
A reveal is an intentional offset, gap, or border line between two adjoining surfaces, used to hide fit variation, define a visual edge, or prevent a hard joint from exposing small manufacturing imperfections. In CNC machining and millwork, it is commonly designed as a controlled perimeter offset around doors, panels, bezels, inlays, trim, or mixed-material assemblies, so the eye reads a clean shadow line instead of every tiny deviation in machining, molding, or installation.
In a CNC machining environment, a reveal is a critical visual tolerance that controls how assembled components read to the eye. The programmer builds it directly into the CAD model as a recess, rabbet, standing proud edge, or perimeter shadow gap. This offset hides edge mismatch and makes production parts look uniform even when tool deflection, sheet flatness error, glue-line thickness, or molded-part warpage cause slight deviations. In millwork and cabinetry, reveals around shaker doors, end panels, appliance panels, and flush hardware create a consistent border while tolerating face-frame location error, hinge adjustment, and substrate movement. In hybrid assemblies where rigid CNC parts meet injection-molded or wood components, the reveal absorbs flexible edge behavior that would otherwise expose waviness and binding. CAM programmers must therefore coordinate tool diameter, cutter radius compensation, finishing passes, and assembly stack-up to stabilize the final visible gap across multiple operations and materials.
Reveal too tight for process capability: The gap disappears or looks uneven after paint, swelling, burrs, or assembly error when the nominal reveal is smaller than the real-world stack-up of cutter path error, material movement, and fastening variation.
Unequal reveal around a part: One side reads wider than another because the workholding datum, machine squareness, or cabinet substrate is off; this happens when the setup is controlled only to part dimension, not to visual centerlines.
Inconsistent edge shadow on mixed materials: A reveal that looks good on CAD can fail with plastic, veneer, MDF, or thin-gauge metal because these materials move, flex, compress, or telegraph edge defects differently, causing visible waviness or binding at assembly.