Sheet Metal Fabrication — Speed for Iteration, Control for Production, and Finishes That Sell
Fiber lasers, turrets, CNC press brakes, hardware cells, weld fixtures, and disciplined finishing—so EVT/DVT hits dates and production fits without heroics.
🧭 Why Sheet Metal Fab (and When It’s the Right Hammer)
Sheet metal fabrication is the fastest way to turn CAD into functional parts and assemblies. Lasers, turrets, and CNC press brakes deliver revisions in hours; fixtures, weld sequence control, and hardware cells protect interchangeability at scale; and disciplined finishing turns good parts into salable product. At SanCo, we place sheet metal programs with partners who run process-first—so your EVT/DVT builds hit dates and your production parts fit the line without babysitting.
- Choose fab when: geometry is sheet-based (≈0.020–0.250″) with bends, hems, louvers, and PEM/clinching hardware; speed and flexibility matter; cosmetics require directional grain, powder/e-coat class, and protected A-faces.
- Consider alternatives when: thin, repeatable parts at high/stable volume → stamping; organic 3D or uniform walls → die casting or investment casting; thick strength-first sections → forging + machining; features needing machining-level tolerance → plan secondary machining.
We’ll provide the crossover math—NRE, piece price, quality risk, and a calendar—so you’re not surprised later.
🧰 What We Deliver (End-to-End)
- DFM & Router Planning: material spec (alloy/temper/galv class), grain direction, minimum radii and bend order, hole-to-bend minimums, relief strategies, edge-safety class, and cosmetic datum orientation.
- Cutting: fiber laser for speed/edge quality; turret punch for clusters, louvers, emboss; nesting tuned for utilization and grain.
- Forming: CNC press brakes with segmented/gooseneck tooling; staged setups; bend deduction validation and springback compensation tied to heat/lot.
- Hardware Insertion: PEMs, clinch studs/standoffs, rivet nuts; force/stroke monitoring and first-article pull tests where justified.
- Joining: MIG/TIG, spot/projection, stud welding; adhesives/mechanical fastening for cosmetics or heat-sensitive assemblies.
- Fixtures & Assembly: datum-driven weld fixtures and poka-yoke nests; torque verification; kitting and barcode labels aligned with your receiving plan.
- Finishing: powder coat, e-coat, anodize (Type II/III), conversion coat, passivation, zinc/nickel/chrome plating; masking maps and rack vs barrel choices made before first cut.
- Post-Process Machining: drill/ream/face only where machining-level tolerance pays back.
- QA & Documentation: ISO 9001 systems; FAI/PPAP; control plans; capability on CTQs; cosmetic boundary samples; gage R&R on critical gaging; full lot traceability.
🧾 Materials We Fabricate
Carbon Steels: CRS, HRPO, HSLA; galvanized/galvanealed; pre-painted sheet for color consistency and downstream labor reduction.
Stainless: 304/316 for corrosion; 430/409 for budget/heat; brushed #4 grain panels with protected A-faces.
Aluminum: 5052-H32 for forming, 6061-T6 for stiffness; anodize/e-coat/powder with masking and conductivity callouts.
Copper Alloys: C110, brass, phosphor bronze for conductivity/spring; burr control and edge conditioning by function.
We lock temper, grain direction, surface class (oiled/dry), sheet source, and protective film up front so every release behaves.
🧠 DFM for Sheet Metal — Where Money Is Won or Lost
- Feature hierarchy & datums: keep CTQs tied to formed datums that survive finishing and assembly.
- Bend radii & relief: radius ≈ f(thickness×alloy×temper); add tear-stop reliefs to avoid cracking and corner bulge.
- Hole-to-edge / hole-to-bend: maintain minimums (often ≥1× thickness; more for hard tempers); avoid pierces across bend lines unless secondary drill/ream is planned.
- Self-fixturing joints: tabs/slots that self-locate in weld nests without telegraphing through cosmetic faces.
- Hardware strategy: verify stack-up and tool access; sequence insertion to avoid interference; standardize PEM callouts.
- Weld access & sequence: plan gun/nozzle access; stitch vs continuous; opposed sequence and clamp datums on CTQs.
- Cosmetics: grain direction, pre-finish deburr/tumble/scotch-brite passes, powder/e-coat class, texture/color code, inspection distance/lighting, and boundary samples.
- Finish stack-up: plan coating thickness into holes/clearances and ground points before cutting.
- Packaging & labels: protective film on A-faces, corner protection, barcode schemas that match your ERP.
Bring the model and the why—we’ll return a flat pattern + bend plan + fixture concept + finishing map that protects rate, yield, and cosmetics.
📏 Capability Snapshot (Directional)
| Area | Directional Capability |
|---|---|
| Laser/Turret cutting | ~±0.004–0.010″ (thickness/geometry dependent); micro features flagged in quote |
| Bend angle | ±0.5–1.0° typical with compensation & gauging |
| Flatness after form | Managed via sequence/restrike/fixturing; A-faces called out in control plan |
| Hole size & positional | Excellent as-cut; press-fit/bearing → drill/ream after form |
| Welding | Distortion controlled with fixtures & sequence; CTQs clamped and rechecked post-weld |
| Surface/cosmetics | #4 grain, bead-blast, polish; powder/e-coat to class with boundary samples |
If a feature truly needs machining-level tolerance, we plan that op up front. Full stop.
🧪 Quality, Documentation & Lead Times
- Quality chain: ISO 9001:2015; traveler/lot traceability; FAI/PPAP on request; control plans; capability on CTQs; gage R&R; coating thickness & cure verification when coated.
- Lead times (typical): quotes 1–3 business days; prototypes 3–7 days (finish/hardware dependent); production 2–4 weeks for fab + common coatings; faster lanes for repeaters and approved colors.
- Records & reporting: dimensional reports, weld coupons where specified, hardware logs, coating certs, packaging validations.
Need bridge parts or pilot builds? We stage capacity, pre-approve powders/colors, and kit to line sequence so EVT/DVT doesn’t slip.
💵 Cost Model — What Moves the Needle
- Material utilization: nesting efficiency, sheet size, common-grain layouts, tabbing strategy.
- Touches & setups: staged brake tooling, combined bends, and hardware cells reduce handling minutes.
- Weld minutes: self-locating features and fixture-driven joints beat freehand; design to reduce heat input.
- Finish choices: e-coat + powder for coverage/corrosion; anodize for aluminum; early masking maps prevent rework.
- Packaging: spend cents on foam/film to avoid dollars of rework and freight damage.
We’ll share a clear break-even vs stamping (and casting/forging if relevant) with a finishing calendar you can book.
⚠️ Common Pitfalls (and Our Fix)
| Pitfall | Impact | Our Fix |
|---|---|---|
| “Stamping geometry” forced into fab | Excess bends, distortion, cost | Re-sequence, add reliefs, fixture; redesign for fab reality |
| Holes across bend lines | Position misses, cracks | Move to flat or drill/ream after form |
| Ambiguous finish & cosmetics | Rejections, rework | Boundary samples; grain/texture callouts; inspection distance/lighting |
| Hardware interference | Scrapped panels | 3D verify standoff/nut zones; staged insertion order |
| Weld pull on CTQs | Out-of-spec assemblies | Opposed sequence; chill bars; datum clamping; post-weld re-gage |
| Late masking decisions | Schedule/cost blowups | Mask maps and rack plan before first cut |
🏭 Typical Use Cases & Part Families
- Electronics Enclosures & Racks: chassis, trays, panels; EMC gaskets; barcode and label trays; powder classes for front-of-house.
- Machine Guards & Access Panels: finger-safe covers, hinged doors, windows; color-coded textures for maintenance cues.
- Brackets & Frames: formed channels, gusseted frames with stitch welds; SPC on hole patterns for interchangeability.
- HVAC & Appliance Panels: cosmetic #4 stainless, masked powder, defined ground points.
- Kitted Subassemblies: hinges, latches, PEM hardware, cable tie features—delivered in line sequence with Kanban options.
📋 RFQ Checklist — What to Send
- 3D + prints with CTQs/GD&T and cosmetic A/B/C faces identified.
- Material & temper (e.g., 5052-H32, 304 2B, CRS/G90), grain direction, any protective film.
- Finish spec (powder/e-coat/anodize/plate), color/texture, masking map, and conductivity/ground points.
- Hardware list (PEM part numbers, studs, rivet nuts), torque or pull-out if required.
- Volumes & cadence, packaging/labeling requirements, and SOP date with gates (EVT/DVT/PVT, FAI/PPAP).
- Inspection expectations (capability data, sampling plans, cosmetic acceptance criteria).
We’ll return a router + nest preview + bend plan + fixture concept, a quote with lead times, and a finishing calendar you can book.
Related Services: Metal Stampings, Machining, Open-Die Forgings, Overseas Sourcing
❓ Sheet Metal Fabrication FAQs
Can fab hold machining-level tolerances?
On select features—yes, with secondary machining. Otherwise expect fab-typical holds tightened with fixtures, sizing ops, and SPC.
Will powder or e-coat change fit?
Yes. We plan coating thickness into holes/clearances and define masking and ground points before cutting any metal.
How do you control welding distortion?
Fixture, sequence, and heat input. We clamp to datums on CTQs and re-gage post-weld; for class-A faces we bias toward hardware/adhesive strategies or hidden joints.
How fast is prototyping?
Often 3–7 days depending on finish and hardware lead time; repeaters move faster with colors/packaging pre-approved.
Do you support PPAP/FAI and APQP?
Yes—documentation level per program, with control plans, MSA, capability on CTQs, and traceability through finishing and packaging.
Can you kit and label for my ERP?
Yes—barcode and label schemas matched to your receiving plan; kitting in line sequence for easy consumption.
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