Specify and Verify the Residual Web of a V-Scored Panel

A V-cut line identifies where boards separate, but it does not fully describe the material left between the two grooves. That residual web affects panel stiffness and the force needed for separation. Define it with the fabricator and assembler so the panel survives handling and can be separated by the intended equipment.

Describe the finished score geometry

Record board thickness, score location, groove arrangement and residual-web requirement with tolerances. Include any requirement for alignment between opposing grooves. Distinguish groove depth from the remaining material; variation in board thickness can make those descriptions produce different results.

NCAB’s manufacturing overview includes residual-thickness testing as part of V-score production. The appropriate dimensions are process and product dependent. A fixed fraction of total board thickness should not replace an agreed, measurable finished requirement.

Review what supports the panel

Map scored lines relative to rails, conveyor support and heavy components. Long intersecting score lines can change how a panel bends during transport or assembly. Include the orientation in which the panel moves through the equipment.

Check the board’s intended copper clearance from the score on every layer. The groove has width as well as depth, and its position varies within tolerance. A line drawn exactly at the profile does not describe the complete region that the cutting process affects.

Connect the web to separation

Identify whether separation uses a qualified machine, fixture or another controlled process. Review component clearance for the actual tool and how the board is supported during cutting. A part can be clear of the nominal score line yet obstruct a blade or its support mechanism.

Do not use hand bending as an informal substitute for the approved process when evaluating assembled panels. The resulting strain and force direction may differ substantially. If component strain is a concern, use an appropriate measurement and qualification plan for the assembly.

Verify representative panels

Measure the residual web at defined locations and retain the method and results. Check whether thickness varies along long scores or near intersections. Compare the finished geometry with handling stiffness and separation results using representative populated assemblies.

Inspect the separated edge and nearby components, then run relevant electrical tests. Passing a dimensional check alone does not demonstrate that separation leaves the assembly suitable for use.

Keep the score requirement, panel orientation, tool access and separation evidence together. Revisit the review after changing board thickness, panel size, component population or depaneling equipment. A previously successful score recipe is tied to that combination, not simply to the presence of a V-cut on the drawing.