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For a cavity measured from one entry face, a simple remaining-floor check is minimum board thickness minus maximum cavity depth. If the board is 2.00 卤 0.10 mm and the cavity is 0.80 卤 0.10 mm deep, the worst-case arithmetic floor is 1.00 mm. That result describes a thickness interval only. It neither proves that the floor is strong enough nor identifies the exact layer present at its surface.

The copper check needs another coordinate. Suppose the nearest protected copper surface below the cavity is 1.30 卤 0.05 mm from the same entry face. The shallowest permitted copper position is 1.25 mm and the deepest permitted cavity is 0.90 mm, leaving 0.35 mm of modeled separation. Against a project-defined 0.20 mm requirement, the dimensional margin is 0.15 mm. These are illustrative numbers, not 吃瓜tv capability limits.

Coordinate definitions must remain consistent. A layer centerline is not its nearest copper surface. A board thickness including solder mask should not be mixed with a cavity depth measured from bare laminate without adjustment. If the tolerance data use different reference conventions, align them before calculating. Apparent numerical precision does not repair an inconsistent dimensional basis.

One possible route is controlled-depth removal from an otherwise established board construction. Another uses prepared openings in selected material layers during the build. A component-embedding process may involve additional lamination, filling and electrical interconnection decisions. The appropriate route depends on what is inside the recess, what must survive around it and how the final surface will be used. The quotation should identify the selected construction rather than rely on the single word cavity.

The distinguishes constructions involving cavities within the layer stack. That CAD representation is useful for communicating intent, but it is not a manufacturing recipe. A separate explains its modeling context. Check that the released fabrication package contains the relevant depth and layer information, not just a convincing 3D image.

A through opening, by contrast, belongs to the PCB slot and cutout guide. A conical screw seat belongs to countersink design. Keeping these feature types distinct avoids quoting a simple routed opening when the product needs a controlled floor, or adding complex depth control when a through cutout would serve the mechanical task.

Every pocket needs a reachable contour. Internal corner shape, pocket width, neighboring components and fixture access influence which process can produce it. Do not draw sharp inside corners and assume a rotary operation will reproduce them. If a component requires corner clearance, show its maximum envelope and let the mechanical design accommodate the agreed corner geometry. An intentional relief must also preserve nearby copper and the required floor.

Check the residual board in more than one direction. A local recess may leave a thin floor, a narrow side wall or a weak bridge toward the board edge. These regions can respond differently during panel handling, depanelization, assembly heating and product use. The floor worksheet addresses only one-dimensional depth arithmetic. Bending, fastening and vibration require the appropriate mechanical analysis and evidence for the actual construction.

At the cavity boundary, inspect traces, planes, vias and reference continuity. A removed layer can change the electrical environment of a nearby signal or interrupt an intended return path. A thermal interface may need an exposed conductor while neighboring circuitry must remain insulated. Neither objective is guaranteed by depth control alone. Include the electrical owner in the review when the recess approaches functional copper.

The acceptance plan should follow the cavity's function. Mechanical clearance may require contour, depth and location measurements. An exposed attachment surface may additionally need defined cleanliness, finish and damage limits. Electrical isolation requires its own design basis and verification. These requirements should be stated before fabrication so the process and inspection can be planned together.

Distinguish an accessible surface measurement from evidence about hidden interfaces. If a microsection, witness coupon or other destructive check is required, agree where it represents the product and what it must show. Do not assume a general board test proves pocket-floor thickness or copper exposure. Conversely, a clean cavity photograph does not establish electrical continuity elsewhere on the board.

Applicable standards belong in the contractual specification with the intended revision and class. separates design, rigid-board performance and visual acceptability roles. It should not be interpreted as a universal cavity-depth tolerance. Project-specific dimensions, inspection locations and deviations still need an agreed written basis.

The main cost drivers include cavity count and area, depth levels, access, tolerances, copper exposure, processing sequence and inspection. An uncomplicated clearance pocket and a precision exposed pad may have similar dimensions but very different requirements. Compare the same drawing and acceptance scope across quotations. Separate setup from recurring work and identify which checks are already included in the board price.

The quotation worksheet deliberately uses your actual rates or internal allowances. For an illustrative order of 100 boards with two identical cavities each at an entered allowance of 0.50 per cavity, feature work is 100. Adding 60 setup and 40 lot inspection gives 200 for that incremental scope. It excludes the base board unless you explicitly select the full-board mode and supply a separate board allowance. These values are arithmetic examples, not published prices.

No cavity volume is converted automatically into machine time, and no unverified yield penalty is added. Several depth levels, special surface treatment or unusual layer exposure may require a different quote structure. Use the tool to organize a comparison, then request a construction-specific quotation. Freight, tax and other commercial items remain outside the subtotal unless their inclusion is documented in the inputs.

Provide the board fabrication data, mechanical drawing, stackup and cavity sections through Contact. Identify the entry face, each recess boundary and level, the protected and exposed layers, quantity and any mating component. Mark unresolved items explicitly. A question about how to obtain the required surface is more useful than a guessed tolerance copied from an unrelated design.

For a surrounding layout review, use PCB DFM; for general service scope, the PCB Manufacturing page provides the commercial route. The cavity drawing should remain the authority for its local geometry. Record all agreed changes in the source design and release package before production or a repeat order.