Sheet Metal Enclosure Quote Checklist: Files, Bends and Finishes

Prepare a clearer sheet metal RFQ with a consistent CAD package, critical dimensions, hardware details and finish instructions before requesting an enclosure quote.

Give the quote a single controlled file package

A useful sheet metal quotation begins with a package that describes one part revision. Gather the formed model, dimensioned drawing, any flat profile file and the assembly references. Put the part number and revision in the file names and in the enquiry.

STEP or STP can communicate the formed shape; a PDF drawing records tolerances, threads and written requirements. DXF or DWG may be useful for flat geometry. The DIYIPCB sheet metal enquiry asks customers to ZIP CAD files for upload.

If the 3D model and drawing disagree, explain which file controls the disputed feature and issue a consistent revision before manufacture. Do not expect the person preparing the quote to infer whether an old flat pattern or a newer assembly represents the intended part.

Specify how the dimensions will be interpreted

Identify the dimensions that determine whether the enclosure works. For an electronics housing, these may include the spacing of board mounting points, the connector opening positions, the lid interface and the outside envelope.

Use clear reference faces or datums for critical measurements. State whether a dimension applies to the formed part or the flat blank. Where a mating component controls the requirement, include an assembly view or the relevant interface drawing.

Distinguish mandatory tolerances from reference dimensions. A short list of important interfaces makes the review more focused than applying the same demanding tolerance to every feature. Acceptance still needs to be agreed for the actual geometry and process.

Review bends and nearby features

Show bend directions and the intended inside radii where they are specified. Ask for a feasibility review when a hole, slot or cutout is near a bend, or when a narrow flange or enclosed shape may affect tool access. A manufacturer’s sheet metal DFM guidance flags features close to bends as a potential source of deformation.

Do not apply one bend allowance or minimum hole distance to every alloy and thickness. Ask how the proposed tooling and material affect the finished geometry, then resolve changes in the drawing. If you supply a flat pattern, identify whether it is manufacturing-ready or a reference requiring verification.

List hardware and assembly requirements explicitly

“Add mounting hardware” leaves too much open. List the fastener type, size, quantity and location. Identify installation direction and the required thread, and state whether the hardware is supplied with the part or only fitted during final assembly.

For tapped holes, describe the thread and relevant engagement requirements. For a welded assembly, mark the joints and explain the required finished condition of visible areas. Include an assembly drawing when several fabricated pieces must fit together.

Check access with the intended tool. A screw location that looks acceptable in a CAD screenshot can still be difficult to reach after the part has been bent or joined.

Make the finish inspectable

Describe the surface with enough detail to compare the result with your expectation. Identify visible faces, grain direction where relevant, the color reference and areas that need masking. Agree any sample or appearance reference used for acceptance.

• For a coated panel, identify close-fitting features and contact areas that need review.
• For a brushed surface, show the intended grain direction on each visible face.
• For a cosmetic enclosure, distinguish customer-facing surfaces from hidden internal faces.
• For an unfinished part, state the required edge and burr condition.

A finish name alone does not define color, texture, gloss and acceptance criteria. Record the details that matter to your product rather than assuming a photograph communicates all of them.

Send a quantity and delivery brief that can be quoted

State the quantity required now and any alternative batch sizes you want priced. Separate a fit-check prototype from an approved production lot. If a date is essential, identify whether it is the required dispatch date or the date the parts must arrive.

You can use this short enquiry structure:

Part/revision: [reference]. Quantity: [initial batch and alternatives]. Material/thickness: [specified or advise]. Finish: [reference and masking]. Critical interfaces: [drawing callouts]. Hardware/joining: [details]. Required arrival date: [date and destination]. Unresolved questions: [list].

Before accepting the quote, check that its drawing revision, material, operations, inspection scope and finish match the request. The final price and schedule should relate to the agreed configuration, with proposed alternatives clearly identified.