Technical Resources
Manufacturing Resources for CNC Machining, Materials & Finishing
Practical guides for engineers and buyers preparing custom precision parts.
Review machining methods, material options, surface finishing, inspection notes,
and RFQ requirements before production starts.
Material & finish suggestions
Inspection document support
Start Here
Find the Manufacturing Answer You Need
Use these resource areas to clarify manufacturing risks, choose suitable materials,
confirm finishing requirements, and prepare better RFQ information.
CNC Machining
Review CNC milling, turning, 5-axis machining, micro machining, and custom part manufacturing routes.
Material Selection
Compare aluminum, stainless steel, brass, copper, plastics, and special materials for custom parts.
Surface Finishing
Review anodizing, plating, passivation, blasting, polishing, coating, and finishing notes.
Tolerance & Inspection
Clarify critical dimensions, inspection reports, material certificates, and acceptance requirements.
DFM Review
Identify machining risks, tolerance risks, finishing risks, and unclear drawing requirements early.
RFQ Preparation
Prepare drawings, material, quantity, finish, tolerance, and inspection notes before quotation.
Before You Request a Quote
Clarify These Requirements Before Sending Drawings
A clear RFQ reduces repeated questions, quotation delay, material misunderstanding,
finishing risk, and inspection disputes. If some requirements are not fixed yet,
OUJI can review the drawing first and give practical suggestions.
Material
Confirm material grade, substitute material options, hardness, certificate needs, and application environment.
Critical Dimensions
Mark key tolerances, datum references, holes, threads, fits, sealing areas, and assembly interfaces.
Surface Finishing
Clarify anodizing, plating, passivation, polishing, blasting, coating, color, thickness, or appearance standard.
Inspection Documents
Tell us whether you need dimensional reports, material certificates, inspection photos, or special test records.
Popular Topics
Common Questions Before Custom Part Production
These topics are useful when your project involves custom CNC parts, prototypes,
low-volume production, finishing, and quality documentation.
CNC Machining Tolerance Guide
Understand practical tolerance expectations for custom CNC machined parts.
CNC Material Selection Guide
Compare common metals and plastics based on function, cost, and machining difficulty.
CNC Milling Design Notes
Review pockets, holes, thin walls, surface requirements, and part complexity.
CNC Turning Part Review
Check shaft parts, bushings, threaded parts, round parts, and turned precision features.
Anodizing vs Plating
Choose finishing based on appearance, corrosion resistance, conductivity, and application needs.
Need Direct Review?
Send drawings and OUJI will help review process, material, finishing, and inspection requirements.
Quick Reference
Materials & Surface Finishing Options for Custom Parts
Material and finishing choices affect cost, lead time, appearance, tolerance control,
corrosion resistance, conductivity, and final inspection requirements.
Common Materials
- Aluminum for lightweight machined parts and anodizing
- Stainless steel for strength and corrosion resistance
- Brass and copper for conductive or small precision parts
- POM, PEEK, nylon and other engineering plastics
Common Finishes
- Anodizing for appearance and corrosion resistance
- Plating for nickel, zinc, silver, gold or functional layers
- Passivation for stainless steel surface treatment
- Polishing and blasting for texture and appearance control
Quality & Inspection
Define Inspection Requirements Before Production
For precision parts, quality control should be considered before machining starts.
Clear inspection notes help avoid misunderstanding between quotation, production,
and final acceptance.
Datum references
Thread and hole checks
Surface finish notes
Material certificates
Dimensional reports
Resource FAQ
Questions Before Sending Drawings to OUJI
What information should I prepare before requesting a CNC quote?
Please prepare drawings or 3D files, material requirements, quantity, tolerance notes,
surface finishing requirements, and any inspection documents you need.
Can OUJI help choose material and surface finishing options?
Yes. You can send drawings and application notes. OUJI can review manufacturability,
function, cost, finishing risk, and inspection requirements before quotation.
Can I send drawings before finalizing all requirements?
Yes. Early drawing review is useful when material, tolerance, surface finish,
or inspection requirements are not fully confirmed.
Do you support prototype and low-volume production?
Yes. OUJI supports prototype, small-batch, and low-volume custom precision parts through
CNC machining, finishing, inspection, and supply chain coordination.
Can you provide inspection reports or material certificates?
Yes. Depending on project requirements, OUJI can support dimensional reports,
material certificates, inspection photos, and other quality documents.
Need Help Applying These Resources?
Send Your Drawings for Material, Process, Finishing and Inspection Review
Share your drawings, material notes, finishing requirements, quantity, and quality documents.
OUJI can review the manufacturing route, possible risks, inspection needs, and quotation details.