Drawing-Based Custom Manufacturing
Custom Sheet Metal Fabrication Services
Sheet metal fabrication turns flat stock into brackets, panels, covers and enclosures through cutting, bending and joining. It is often a practical route for thin-walled equipment parts without machining the whole shape from solid material. JUNCHU coordinates the flat blank, forming sequence, hardware and finish around the final assembled geometry.
Panels · Enclosures
Brackets · Frames
PART TYPES
Steel · Stainless
Aluminum · Copper
MATERIAL ROUTES
Finishing · Inspection
Assembly
DOWNSTREAM SUPPORT
Thickness · Bends
Finished Geometry
FORMED-PART INPUTS
Sheet Metal Processes
From flat blank to formed component
The finished shape depends on both the cut pattern and the forming sequence. Plan bending, joints and installed hardware before releasing the blank for cutting.
Laser cutting profiles flat sheet with holes, slots and ventilation cutouts from digital geometry. Material, thickness, small-feature size and edge condition determine the route. Define burr direction and visible faces; cut edges may need deburring before forming or coating.
Before Manufacturing
Define Your Project Requirements
The quotation confirms the drawing requirements, manufacturing scope, inspection and schedule for your specific parts.
01
Critical Fits
Identify datums, mating dimensions and any post-finish fit requirements.
02
General Dimensions
Agree tolerances for the selected material, process and geometry.
03
Production Schedule
Confirmed after reviewing tooling, purchased items, quantity and finish.
04
Size & Handling
Share overall dimensions and weight so workholding, processing and packing can be reviewed.
Materials & Interface Planning
Match each material to its role
Material / Requirement
Selection Notes
Carbon Steel
Structural and general fabrication grades
Coated Steel
Specify coating type and condition
Sheet Thickness
Define nominal thickness and any critical thickness tolerance
For coated steel, identify the coating and agree the required condition of cut edges, bends and welded areas.
Start Your Sheet Metal Fabrication Project
Review the finished shape, sheet specification and joining details together, then confirm how dimensions and appearance will be accepted.
Review the Design
Share the formed model, drawing, sheet grade and thickness, bend details, hardware, finish and order quantity.
Cut & Form
Agree cutting, bending, joining and finishing operations, with the first-part approval stage defined before the batch proceeds.
Check the Fit
Check formed dimensions, hole alignment, hardware and visible surfaces against the drawing and agreed acceptance plan.
Protect & Pack
Specify face protection, separators and part labels to protect finished panels and keep matching components identifiable during delivery.
Typical Sheet Metal Components
Applications that use formed sheet efficiently
The examples below show how cutouts, bends, fasteners and surface requirements come together in finished equipment parts.
01
Equipment Enclosures
Folded walls, cover interfaces and installed hardware; control door gaps, access and the finished fit.
02
Mounting Brackets
Bent flanges and mounting-hole patterns; review load direction, bend location and assembly clearance.
03
Front & Access Panels
Cutouts for controls, connectors and service access; define visible faces, burr direction and cosmetic finish.
04
Guards & Covers
Formed protective components with safe edges and mounting features; application-specific safety requirements need a defined design.
05
Frames & Supports
Joined sheet components or mixed fabricated assemblies; manage weld distortion and locating interfaces.
06
Conductive Components
Selected copper or brass sheet parts with contact and forming requirements; specify grade, burr control and any plated contact areas.
Project Planning
Planning a Sheet Metal Order
Consider the formed assembly, joining sequence and coating requirements alongside the flat blank.
Choose the Manufacturing Route
Cutting and bending often suit enclosure prototypes and changing designs. Dedicated stamping tooling may become relevant for repeated geometry and sufficient volume. Compare tooling investment, material utilization and secondary operations before selecting a route; a flat pattern alone does not define the final formed part.
What Drives Fabrication Cost
Material grade and thickness, cutting length, bend count, tool access, hardware insertion and weld length affect effort. Cosmetic weld dressing and tight post-weld dimensions may add work. Identify which faces are visible and which dimensions control assembly so the quotation reflects the required finish level.
Check a Formed Sample
Review the folded part against assembly datums, not only the blank dimensions. Check cover alignment, fastener access, installed hardware and distortion after joining. Where coating affects sliding or locating features, verify the required interfaces in their finished condition before approving the batch.
Define Finish and Delivery Scope
Agree deburring, weld treatment, cosmetic zones, coating texture and masked contact areas. State whether threaded hardware is fitted before or after coating. Separate loose panels or protect mating surfaces during packing, and identify the drawing revision and any assembly hardware supplied with each kit.
Component images are 3D concept illustrations of representative parts.
Before You Start Your Project
Common Questions
Before an RFQ
Review the information needed for a clear quotation, practical process planning and agreed inspection requirements.
What information should I include in an RFQ?
Send the formed 3D model and a dimensioned drawing with material grade, thickness, bend radii, quantities and finish. Mark hardware, welds, critical mating dimensions and visible faces. If a flat pattern is supplied, confirm whether it is reference data or a released production file; the forming route and bend allowances must be agreed before cutting.
Which drawings are useful for formed sheet metal parts?
Supply a formed 3D model, a dimensioned drawing and, if available, a flat pattern. State material, thickness, bend requirements, threads and cosmetic faces. The fabrication flat pattern may need adjustment for the selected tooling and bend allowance.
How can I reduce bending and welding problems?
Keep holes and slots clear of bend zones where practical, provide adequate flange access and identify critical post-weld dimensions. Review the forming sequence, springback and distortion requirements before production.
How should I specify surface finish and appearance?
State the finish type, color reference, texture, cosmetic surfaces and areas that must remain untreated. For appearance-sensitive parts, agree on a physical sample and acceptance conditions. Coating thickness, alloy and pretreatment can affect dimensions and color; review these together with the drawing.
What should be checked before releasing formed and welded parts?
Check the formed component against the assembly datums, critical hole locations, bend requirements and any post-weld dimensions. Review installed hardware, cover alignment and visible surfaces. Agree weld cleanup, coating, masked fits and final inspection requirements before batch release. The accepted flat pattern alone does not define acceptance of the finished assembly.
Specify the Formed Component and Its Assembly Datums
| Feature | Review point | Drawing information |
|---|---|---|
| Bends and nearby openings | Bend radius, material condition, tool access and local distortion | Provide the formed geometry and identify critical dimensions after bending. |
| Welded joints | Access, joint arrangement, distortion and cleanup | Show weld locations and appearance requirements. |
| Inserted hardware | Hardware type, installation access and mating thickness | Identify the part number or approved equivalent and assembly orientation. |
| Coated enclosure | Masking, grounding contacts, threads and final fit | Mark untreated zones and dimensions to check after coating. |
Use flat patterns as controlled supporting information
A supplied flat pattern should be consistent with the formed model, material and thickness. Review the agreed manufacturing data before cutting; changes to bend assumptions can affect the finished dimensions and hole locations.
Use the RFQ checklist to bring these decisions into one controlled enquiry package.
Ready To Start Your Project?
Start With Your Drawings - or Tell Us What You Need
Share drawings, photos or sketches with your quantity, material, finish and target date. We review the available information, clarify technical requirements and confirm quotation timing. Complex or multi-process projects may require additional review.
Discuss confidentiality and NDA requirements before sharing sensitive project files.