CNC milling / indexed setups
Multi-face blocks & housings
Custom blocks, housings and mounting components with related features on several faces.
Key reviewDatum references, bore position, tool access and setup transfers.
OUJI / DONGGUAN, CHINA
Custom precision components. Made to your drawings.
CNC machining, grinding and coordinated finishing for prototypes and small-batch orders. Every complex part starts with an engineering-led process plan.
Complex parts & critical fitsSamples & small-batch repeat orders
Engineering-led planningA written process plan for complex parts
Several processes, one partMachining, grinding & coordinated finishing
Sample to repeat orderLow-volume CNC machining to your drawings
01 / ENGINEERING BEFORE MACHINING
Complex parts start
with a written process plan.
OUJI’s engineering team defines the operation sequence for every complex part, planning stock, workholding and machining allowances before machining starts.
The aim: control distortion, support the required tolerances and keep the manufacturing route practical.
Discuss the route for your partWHAT THE PROCESS PLAN ADDRESSES
Stock size & workholding
Engineering considers the stock dimensions and clamping method together, accounting for stress-related distortion and the features that must hold tolerance.
Operation sequence
The plan sets the order of operations and identifies the specific processes needed to achieve the drawing requirements, including treatment or finishing where required.
Machining allowances
Material to leave for later operations is planned in advance, balancing the final accuracy requirements with machining efficiency.
- Engineering leads
- Defines the process plan and technical decisions.
- Production planning supports
- PMC follows the schedule and coordinates delivery progress.
- Quality supports
- Helps identify and manage quality risks.
- Purchasing coordinates
- Connects suppliers and the departments involved.
02 / CUSTOM PARTS & CRITICAL FEATURES
Different parts.
Different manufacturing routes.
A bore may need grinding; a coated part may need a bare contact face. These OUJI projects show how the requirements change the route.
Turning / grinding / bore checks
Shafts, bores & ground fits
Turned shafts, sleeves and mating features that combine machining, grinding and deburring.
Key reviewFinal diameter limits, concentric features, roughness and internal edges.
Anodizing / secondary machining
Parts with selective finishes
Components with specified coated areas, bare-metal interfaces or finishing followed by machining.
Key reviewCoating boundaries, protected surfaces and dimensions after finishing.
03 / PROJECT EVIDENCE
Related holes.
Different faces.
One locating strategy.
For this 50-part order in 304 stainless steel, the challenge was the position of holes across several faces. OUJI coordinated solution heat treatment, workholding, 3+2 indexed machining and final CMM inspection.
- Material
- 304 stainless steel
- Order quantity
- 50 parts
- Machining
- 3+2 indexed milling
Drawing requirementsHole position and the drawing datum references
Workholding & indexingThe locating fixture used for multi-face machining
Final CMM inspectionThe finished component in its CMM probing setup
View the drawing & reported CMM resultsTwo displayed position evaluations, with their reference systems and limits
The excerpt reports 0.0342 mm and 0.0049 mm, each below its programmed Ø0.0500 mm limit. These are two displayed evaluations; 50 parts is the order quantity, not a documented inspection sample size.
| Report feature | Program datums | Program limit | Position result |
|---|---|---|---|
| FCF1 (circle 1) | C → B | Ø0.0500 mm | 0.0342 mm |
| FCF2 (circle 2) | C → A | Ø0.0500 mm | 0.0049 mm |
OUJI’s internal engineering team approved the B → C to C → B datum-order change, using the customer’s requirements as its control basis. The drawing references ISO 8015 and ISO 1101; the CMM screenshot shows an ASME Y14.5 setting. The displayed values are compared with the programmed limits, without treating the standards or datum orders as interchangeable. This excerpt covers two program results, not a complete CMM certificate or a sampling plan for the 50-part order.
04 / EVALUATE OUJI AS YOUR SUPPLIER
See who makes the part.
Know what you can verify.
OUJI is a custom parts manufacturer in Dongguan, China. Our own machining and inspection are connected with specialist processing through a partner network.
DIRECTLY OPERATED BY OUJI
Machining & inspection
CNC milling, turning, Swiss-type/micro machining and precision surface grinding, with in-house inspection.
COORDINATED WITH SPECIALIST PARTNERS
Heat treatment & surface processing
Specialist treatments, plating and other finishing steps are included in the agreed process route. Confirm the required process and acceptance criteria with us.
Agree the evidence before production.
Material certificates, dimensional inspection reports and first article records — specify at quotation. Tell us which features and how many parts need reporting.
05 / MATERIALS, FITS & FINAL CONDITION
Specify the part
as it needs to arrive.
The final material condition, surface finish and critical dimensions belong in the same review. Details already shown on the drawing do not need to be entered again.
Metals & engineering plastics
Aluminum alloys6061 / 6082 / 7075
Include grade, temper, anodizing requirements and any surfaces that must stay bare.
Material guidanceStainless & alloy steelsGrade and condition to drawing
Specify heat treatment, hardness and which dimensions require final grinding.
Material guidanceBrass, copper & other metalsMaterial-specific process review
State the exact grade. Titanium and nickel-alloy parts need a drawing and material review.
Material guidanceEngineering plasticsPOM / nylon / UHMW-PE
Identify the polymer, mating conditions and required surface or contact properties.
Material guidanceWhat the drawing review should resolve
- Critical sizes & geometric tolerances
- Limits, datum order and the drawing standard.
- Heat treatment & final finishing
- Hardness, coating and dimensions after processing.
- Internal features & edges
- Bore finish, burr limits and accessible inspection points.
- Inspection & traceability
- Critical-feature reports, sampling and material records.
Feasibility is reviewed for your geometry and manufacturing route. Specify any dimensions that must be met after heat treatment, grinding or coating.
Tolerances & drawing guidance06 / BEFORE YOUR FIRST ORDER
Questions from
engineering & procurement.
Scope, quantities, tolerances and the information needed to start.
Ask about your partWhat does OUJI manufacture as a custom precision component?
OUJI manufactures non-standard components from customer drawings, including machined blocks, housings, shafts, sleeves and parts requiring several manufacturing steps. The route combines material review, CNC machining, finishing and agreed inspection. OUJI is based in Dongguan, China and works with overseas engineering and procurement teams.
How does OUJI control a complex part with several manufacturing steps?
OUJI prepares a written process plan for each complex part. Engineering leads the stock-size, workholding, operation-sequence and machining-allowance decisions. Production planning (PMC) supports delivery control, quality supports risk management, and purchasing coordinates suppliers and related departments. OUJI directly operates CNC milling, turning, Swiss-type/micro machining and surface grinding; specialist treatments and finishing are coordinated with partners.
Can you machine tight-tolerance features after heat treatment or finishing?
We review the sequence for the actual part: material condition, geometry, critical fits, datum references and the final inspection method. This can include final grinding or selective machining after a specialist process. Send the drawing with the required final dimensions and surface condition so feasibility can be checked before quotation.
Can you make a prototype and quote later repeat batches?
Yes. Ordinary CNC samples can start at one piece; Swiss-type/micro machining samples start at 100 pieces. Include the sample quantity and expected repeat quantity in your inquiry if known, so both can be reviewed. For each repeat release, confirm the drawing revision and any changes to material, finish, quantity or acceptance requirements. Programming, setups and specialist processing affect the quotation.
What should I send to get a quotation?
Send a 3D model and a dimensioned 2D drawing where available, quantity, material and finish. Identify critical fits, inspection documents and your required date. Details already in the drawing do not need to be repeated. You can start the inquiry without uploading files and send them later by email.
Can one RFQ include different materials and part numbers?
Yes. Include a part list with the drawing revision, quantity, material and finish for each item. OUJI reviews each part’s requirements and the processes needed across the package. Identify priority parts or any separate dispatch requirements.
How are production lead time and inspection documents agreed?
Production lead times run from drawing approval and technical confirmation to dispatch. Transit time is not included. Quantity, material availability, finishing and inspection requirements are confirmed with the quotation. Material certificates, dimensional inspection reports, first article records and other agreed quality documents can be provided when specified during quotation.
What can I verify before you ship my first order?
OUJI provides finished-part photos and shipment photos. Full dimensional inspection reports, special measurements and other required reports must be agreed during quotation. You can review the agreed results and confirm release before shipment.
Can we arrange an NDA before sharing drawings?
Yes. Send your NDA for review before sharing sensitive project files, or ask us for a standard confidentiality agreement.
YOUR NEXT PART
Start with your part.
Tell us the part and quantity. Drawings can follow by email.
A useful starting package
- 3D model and dimensioned 2D drawing
- Part number, revision and quantity
- Material, finish and critical fits
- Required date and inspection documents
No need to repeat details already in your drawings.
Planning samples and a later repeat batch?
Include both quantities if known. We’ll review the requirements for each release with you. Ordinary CNC samples start at one piece; Swiss-type/micro machining has a separate 100-piece sample policy.
CNC production lead-time guide
- Standard parts, no heat treatment
- Earliest: From 3 business days for simple partsTypical dispatch: Within 14 business days
- Heat-treated parts
- Earliest: From 14 business daysTypical dispatch: About 21 business days
- Complex parts requiring heat treatment
- Earliest: From 30 business daysTypical dispatch: Confirmed with quotation
Production lead times run from drawing approval and technical confirmation to dispatch. Transit time is not included. Quantity, material availability, finishing and inspection requirements are confirmed with the quotation.
Prefer email, or need an NDA first?
info@ouji-tech.comManufacturing information supplied by the OUJI team. Photographs and records are drawn from OUJI’s published manufacturing cases.
Page updated . Project-specific inspection details are stated with each case.