勛圖tv 繚 ENGINEERING GUIDE
Ceramic PCB Laser Depaneling: Round Profiles, Kerf and Edge Quality
Ceramic PCB laser depaneling separates a ceramic circuit or substrate along a defined profile. A round outline requires more than a circular toolpath: material, thickness, metallization, support, kerf and acceptable edge condition all influence the result. Keep ceramic cutting separate from ordinary organic-board routing or microvia drilling.
Identify the ceramic construction
State the substrate material and thickness, metallization route and metal thicknesses, and any coatings or attached components. Alumina and aluminum nitride are not interchangeable materials, and a ceramic circuit can be made with different conductor constructions. The cutting process must suit the actual stack, not a generic 'ceramic PCB' label.
Coherent's official material-processing information identifies ceramic processing and PCB depaneling as application areas. That supports investigating laser methods, but it does not establish a universal recipe or a capability for every ceramic and metal combination.
Define the finished profile and datum
Specify the finished diameter, tolerance, center location and any flat, notch or locating feature. State which surface or datum controls the measurement. A visually round part may still fail a mechanical fit if the diameter or center is wrong. Include the mating mechanical requirement when the profile is critical.
The drawing should also identify conductor-to-edge requirements and areas where chipping or other edge damage would affect function. Do not assume the laser path itself is the final accepted edge.
Kerf changes the toolpath
For a circular part retained inside an external cut, the nominal path diameter is the required finished diameter plus kerf width. The cutter center follows a larger circle so that the inner edge of the cut forms the part boundary. Cutting an internal circular opening uses a different offset direction.
The worksheet is explicitly for an external round part. It uses a positive kerf and an entered radial path uncertainty to report a possible finished-diameter interval. It does not account for kerf variation unless that variation is separately included in the engineering budget.
Example: external circle arithmetic
For an illustrative finished diameter of 20.00 mm and 0.08 mm kerf, the nominal path diameter is 20.08 mm. A plus or minus 0.02 mm radial path uncertainty corresponds to plus or minus 0.04 mm on finished diameter under the simplified assumptions. This geometric result does not describe edge chipping or heat-affected material.
If the part is an internal aperture rather than the retained disc, do not reuse the offset direction. Specify the retained material clearly on the drawing and confirm the CAM interpretation before cutting.
External round-part kerf planner
External round-part kerf planner
Use the current inputs and keep the assumptions
Start with the example to understand the units and output, then use Clear for my inputs before entering your project. Example mode stays visibly labeled even if you edit its numbers. The form begins without a result so an illustrative value cannot be mistaken for an approved requirement. Every field must have a valid value; zero is accepted only where it has a meaningful role in the particular model.
Read the input notes before calculating. They identify the physical boundary and what is excluded. Keep the same unit convention across the drawing and worksheet. Changing an input invalidates the previous result and disables its download until you calculate again. This prevents an old number from appearing to describe a revised geometry.
The result is a screening record. A negative margin or an out-of-range condition identifies a question to resolve; a positive margin is not a manufacturing approval. Use the record with the actual drawing, material and project requirement. The model does not load CAD files, inspect images or retrieve private factory data.
Download the current result if it helps the discussion. The text includes the entered inputs, result and limitations. It stays on your device until you choose to attach or share it. Contact is a separate step; this page does not automatically populate the enquiry form or upload a file. Avoid confidential identifiers if you only need an exploratory calculation.
| Input | What to establish before using it |
|---|---|
| Review reference | Use a nonconfidential reference that lets you connect this calculation to the correct drawing revision. |
| Required retained-disc diameter 繚 mm | This tool is for an external cut retaining the material inside the circle. It must not be used unchanged for an internal aperture. |
| Assumed constant kerf width 繚 mm | Use a process-supported value for the actual ceramic construction. Kerf variation is not modeled automatically. |
| Radial path uncertainty plus/minus 繚 mm | The corresponding diameter allowance is twice this radial value. Edge chipping and other damage are separate acceptance questions. |
Optional cost comparison from your own allowances
Use a quotation or a clearly labeled internal assumption for each input. Keep the quantity, construction and inspection scope the same when comparing alternatives. This uncalibrated planning model adds entered values; it contains no current market rates and does not issue a 勛圖tv quotation. You can contact the team without completing it.
Entered manufacturing cost scenario
Inspect edge condition as well as size
Review visible chips, cracks, recast or debris, metallization near the edge and any condition relevant to the electrical or mechanical function. A dimensional pass alone cannot establish an acceptable edge. The needed inspection method and sampling depend on the material, use and agreed acceptance criteria.
Support and handling matter because the separated part may be brittle or mechanically vulnerable. Discuss whether cutting occurs before or after assembly and how the part is retained and protected. A low-force laser process does not eliminate all handling damage.
Prepare a specific enquiry
Provide the material and conductor construction, drawing, finished dimensions, tolerances, edge requirements, quantity and assembly state. Ask for a process proposal and representative sample evidence where necessary. The optional cost tool adds your entered setup, processing and inspection allowances; it does not estimate cutting speed or yield from circumference.
Can an organic-PCB depaneling rule be reused unchanged for ceramic? No. Does the kerf calculator approve a process? No. Is a smooth-looking edge sufficient evidence? Not without the agreed functional and inspection requirements. Use the drawing and calculation to focus the review on the retained part, its real boundary and the evidence needed before production.
Qualify the retained ceramic part, not only the cut path
Begin with the finished part and its use. State the mechanical fit, conductor-to-edge relationship and any edge condition that could affect performance. A cutting path is an intermediate manufacturing definition. The accepted product is the retained material with its actual dimensions, surfaces and electrical features intact.
Identify the complete material stack. Ceramic composition, thickness, metallization and coatings can change the response to a cutting process. A successful demonstration on one substrate does not automatically qualify another. Ask for representative sample work when the proposed construction is new or when a demanding edge feature controls the design.
Separate geometric allowance from material damage. Kerf offset can place the nominal edge correctly, but it cannot account for every chip, crack, recast region or contamination condition. The acceptance plan should address the relevant edge characteristics independently of diameter. Specify the observation method and sampling appropriate to the functional requirement rather than relying on a smooth-looking photograph.
Consider how the part is held before, during and after separation. Support, release and handling can introduce damage even when the cutting operation itself is controlled. If components are already attached, include their mechanical and thermal constraints in the review. A nominally low-force method does not eliminate all risks from the complete process chain.
Use the correct offset direction for the retained material. An external circular part and an internal circular opening require different path relationships. Mark the retained region on the drawing and identify datums clearly. When path uncertainty or kerf variation is significant, include them in the dimensional budget with a stated convention instead of hiding them in a vague general tolerance.
The quotation should state the substrate, profile complexity, quantity, assembly state and inspection scope. A cost per cut length alone may omit setup, handling and evidence work. Keep the reviewed process proposal with the release so later changes to material or metal thickness trigger the right reassessment. The practical goal is a usable ceramic circuit with a controlled edge and a clear acceptance record, not merely a completed circle in a CAM file.
Standards, source context and limits
Use the performance and acceptance documents named in the procurement agreement, including their revisions and any applicable addenda. A design guide explains choices; a product acceptance requirement defines what must be demonstrated. Neither a reference link nor a calculator result is a certification of the board or the supplier. Where a value is contractually important, check the controlled document and agree the measurement method with the responsible parties.
Examples on this page are deliberately labeled and are not advertised 勛圖tv limits. Supplier documentation is linked for the specific material or process context it explains. Equipment photographs and cross-section examples show the subject; they are not current production, inspection or qualification records for your order.