勛圖tv 繚 ENGINEERING GUIDE
SMT Panel Requirements: Conveyor Rails, Fiducials, Support and Data
SMT panel requirements connect a PCB arrangement to printing, placement, soldering, inspection and handling equipment. There is no single rail width or panel size that is correct for every assembly line. The right requirements come from the intended route and the features of the populated panel.
This page is an equipment-interface checklist. The geometry tool screens an entered conveyor width range and clamp-clearance budget. It does not claim to know 勛圖tv machine limits or approve the panel for every operation.
Collect constraints from the complete route
Ask about the printer, placement system, conveyors, ovens, inspection equipment and any fixtures involved. The controlling condition may come from a later operation rather than the first machine. Identify which panel edges are carried and how the orientation changes through the route.
Record maximum and minimum dimensions using the equipment owner's definitions. Overall panel size, transport width and usable process area can be different quantities. A panel that fits one envelope may still interfere with a clamp, support pin or component overhang.
Define rails by their function
Rails can provide handling and clamping space, support features or identification locations. Their required width and location should follow the actual interface. Do not add a generic rail on all four sides without checking whether it serves the process or increases waste unnecessarily.
Keep components, lands and other features clear of the agreed clamp and transport zones. The relevant obstruction may be a component body above the board rather than a copper feature at its surface. Review both sides of the assembly if the route includes double-sided processing.
| Review item | What to establish |
|---|---|
| Transport | Define carried edges, orientation and equipment dimension conventions. |
| Clamp zone | Review component bodies and both board sides where applicable. |
| Alignment | Keep fiducials and tooling features visible and controlled. |
| Data | Reconcile array geometry, placement information and separation instructions. |
SMT transport-width and clamp screen
SMT transport-width and clamp screen
Use the current inputs and keep the assumptions
Start with the feature or process question you actually need to resolve. Fields are blank until you enter values or deliberately load an illustrative example. Example mode remains labeled after editing, so a sample is not silently presented as verified project data. Clear the example before preparing a project-specific record.
Use the units printed beside each input. Keep the drawing revision, measurement basis and source of any allowance in your controlled project records. A field that asks for a limit expects your agreed requirement; the example is not an IPC threshold or a statement of 勛圖tv capability. A numerical result should lead to a focused review, not replace it.
Changing any input invalidates the displayed result and disables its download until you calculate again. The text download contains the current inputs, results and assumptions. Nothing is uploaded, stored in analytics or automatically transferred into the Contact form. You may attach the file manually if it helps explain your enquiry; completing the worksheet is optional.
| Input | What to establish before using it |
|---|---|
| Review reference | Use a nonconfidential reference to connect this worksheet to the correct design or process revision. |
| Board-array width 繚 mm | Excludes the two side rails added below. |
| Rail on each carried side 繚 mm | Use the proposed orientation and carried edges. |
| Entered equipment minimum width 繚 mm | User-supplied interface constraint, not a 勛圖tv machine claim. |
| Entered equipment maximum width 繚 mm | Width alone does not establish compatibility with every machine. |
| Available edge clearance 繚 mm | Use actual components and features in the clamp zone. |
| Required clamp intrusion 繚 mm | Obtain the requirement from the relevant equipment or fixture owner. |
Use the conveyor worksheet as a narrow screen
The tool adds two entered side rails to the board-array width and compares the result with the entered equipment range. It also subtracts clamp intrusion from the available edge clearance. All equipment values are supplied by the user; none are hidden capability defaults.
A width within the range does not prove compatibility with length, thickness, mass, warpage, component height or other constraints. Keep the result with a broader interface checklist. If a margin is negative, resolve that geometry before assuming a machine adjustment will compensate for it.
Place fiducials and tooling features deliberately
Global and local fiducials support different alignment tasks. Tooling holes, support regions and identification features also have distinct purposes. Confirm the required geometry, visibility and location with the assembly process owner and preserve them in the controlled panel drawing.
Do not put a fiducial in a region obscured by a clamp or later component. Keep its relationship to the panel origin and orientation clear. A copied panel template can be a useful starting point, but it still needs review against the actual board and equipment route.
Consider support and separation together
The panel needs support during printing and other operations, then a controlled method of separation. Component placement near tabs or score lines can affect that later task. Review support contacts against underside components and any restricted regions.
Use the breakaway-tab guide for separation access and mechanical concerns. A panel designed only to maximize the number of boards per area can create avoidable damage or handling work. Utilization is one criterion within the complete assembly route, not the sole objective.
Keep placement data and panel identity aligned
Agree whether assembly data are supplied for a single board or for the complete panel. Preserve orientation, instance positions and reference conventions. Mixed designs need clear quantity and identity controls so the assembly team can connect each board with the correct data.
The Gerber panelization guide covers source and release coherence. Do not assume that a panel drawing automatically transforms the placement file. Assign that task and verify the resulting data before the build is scheduled.
Request a panel review early
Send the proposed array, board outline and thickness, placement data, component-height information and planned separation route. Include any customer-fixed panel features and the quantity. State which constraints are known and which need the assembler's input.
A useful response should identify the controlling interfaces and any proposed changes with their consequences. This lets design and purchasing compare a feasible assembly scope. It also avoids a common late-stage surprise: a fabricated panel that is dimensionally correct but incompatible with the intended handling or fixture arrangement.
Give fabrication and assembly one coherent panel definition
The panel drawing should identify its owner, revision, orientation and relationship to the source board. It should show the array and the features needed for handling, alignment and separation. A clear drawing helps the teams discuss the same object even when their software and manufacturing data differ.
Keep fabrication working-panel choices separate from the customer or assembler's defined assembly panel. Manufacturing coupons and additional process margins may belong outside the assembly unit. Agree that boundary so a request to optimize utilization does not silently change the data expected by placement or inspection.
Review the complete route before fixing the array. Printing support, conveyor edges, component overhang, inspection access and separation can each impose constraints. A panel that satisfies only the maximum width of one machine is not fully reviewed. Obtain missing interface values from the relevant equipment or process owner rather than filling them with generic online numbers.
Assign transformations of placement and other assembly data. Repeated board artwork does not automatically create verified panel-level assembly files. Mixed designs need particularly clear identity and quantity controls. Preserve a mapping from each instance to its source and position so inspection or rework can be traced.
For release, package one coherent revision and record the critical checks. If a supplier proposes changes, identify the affected geometry and downstream files. Approve the complete consequence rather than only the improved nesting picture. This approach supports cost reduction while preserving a usable assembly and separation route, which is the practical purpose of panel engineering.
Standards, source context and limits
Use the official references for their stated scope and the applicable controlled document for contractual requirements. A public scope page, product description or application note is not a complete acceptance specification. Material-supplier guidance applies to the named material and process; it is not evidence that every option is available for this board.
Agree the document revision, construction, inspection method and any exceptions with the responsible engineering and quality teams. The explanatory drawings and worksheet examples on this page are original planning aids, not factory records, qualification results or compliance certificates.