ChinaCNC UK Practical CNC sourcing from China for UK engineers

ChinaCNC UK

Practical CNC sourcing from China for UK engineers

Latest Articles

The Second Deformation: Sequencing Stress Relief on Chinese CNC Parts
Sourcing & Procurement

The Second Deformation: Sequencing Stress Relief on Chinese CNC Parts

A Chinese CNC part can pass first article inspection and still move weeks later, because machining releases residual stress rather than creating it. This article sets out an RFQ clause set for stress relief, the sequencing decisions that matter more than the furnace temperature, and the evidence a UK buyer should demand before accepting a supplier's assurance.
The Fenced-In Factory: Reading Scope and Site on a Chinese CNC Supplier's ISO 9001 Certificate
Supplier Audits & Quality

The Fenced-In Factory: Reading Scope and Site on a Chinese CNC Supplier's ISO 9001 Certificate

An ISO 9001 certificate is often treated as a pass into the approved supplier list, but its value depends on four fields that UK buyers rarely read closely: issuer, number, expiry and scope. This article explains how to test whether the certificate actually covers the site and activities behind a Chinese CNC quotation, and what evidence to request alongside it.
Need-to-Know Geometry: A CAD Release Protocol for Chinese CNC Suppliers
Sourcing & Procurement

Need-to-Know Geometry: A CAD Release Protocol for Chinese CNC Suppliers

Sending CAD to a Chinese CNC supplier is a controlled release, not an email attachment. This guide sets out a practical protocol for minimising geometry, watermarking copies, checking supplier IT hygiene and keeping an audit trail that survives a revision dispute.
Crisp, Not Sharp: A Measurable Edge Standard for Chinese CNC Parts
Supplier Audits & Quality

Crisp, Not Sharp: A Measurable Edge Standard for Chinese CNC Parts

A general note to deburr all edges leaves the supplier to decide what good looks like. This article sets out a measurable edge standard for Chinese CNC parts, covering callouts, methods, bench inspection and the cost of crisp versus rounded edges.
Clamped, Not Confirmed: Reviewing Workholding Strategy Before a Chinese CNC Award
Supplier Audits & Quality

Clamped, Not Confirmed: Reviewing Workholding Strategy Before a Chinese CNC Award

UK buyers often interrogate the machine tool and the drawing while leaving the fixture to the supplier’s discretion. That discretion can introduce distortion, datum shift and poor repeatability, particularly on thin-walled or asymmetric parts. This pre-award review sets out what to ask, what to record and how to prove the workholding before production settles.
A Controlled Maybe: Making Chinese CNC Concessions Auditable
Supplier Audits & Quality

A Controlled Maybe: Making Chinese CNC Concessions Auditable

Out-of-tolerance Chinese CNC parts can be accepted, but only through a documented concession that links the deviation to a specific drawing, batch and approver. This article sets out a UK buyer’s process for assessing fitness for purpose, adjusting price where appropriate and keeping the decision visible after installation.
The Handover Point: Why a Chinese CNC Quote Needs More Than Three Letters
Sourcing & Procurement

The Handover Point: Why a Chinese CNC Quote Needs More Than Three Letters

A Chinese machining quotation often names a price, a lead time and an Incoterm — but leaves the named place, origin charges and insurance cover to be discovered later. This article sets out how EXW, FOB, CIF and DAP shift risk on CNC orders bound for the UK, and what to write into the purchase order so the quote, invoice and transport document tell the same story.
The Question Behind the Tolerance: Choosing Inspection Methods for Chinese CNC Parts
Supplier Audits & Quality

The Question Behind the Tolerance: Choosing Inspection Methods for Chinese CNC Parts

A tolerance says what is acceptable; it does not say how the question should be answered. This article sets out how UK buyers can attach inspection methods to feature risk on Chinese CNC parts, so that CMM reports, hard gauges, functional checks and first-article fixtures are used where they actually add confidence.
Second in the Queue: Holding Machine Time in a Chinese CNC Shop
Sourcing & Procurement

Second in the Queue: Holding Machine Time in a Chinese CNC Shop

Chinese CNC suppliers rarely schedule strictly by order date; they schedule by relationship, cash and predictability. This article explains how capacity is actually allocated and sets out practical steps — from capacity deposits to named production windows — that UK buyers can use to protect delivery dates.
Revision Control at Arm’s Length: A Protocol for Engineering Changes on Chinese CNC Contracts
Sourcing & Procurement

Revision Control at Arm’s Length: A Protocol for Engineering Changes on Chinese CNC Contracts

A late drawing change is a commercial event, not an administrative one. This article sets out a practical ECN protocol for UK buyers placing CNC work in China: locking revisions before release, defining cut-off points, pricing changeovers in advance, and recording the revision each batch was actually built to.
Reading the Lot, Not the Part: Acceptance Sampling for Chinese CNC Deliveries
Supplier Audits & Quality

Reading the Lot, Not the Part: Acceptance Sampling for Chinese CNC Deliveries

AQL inspection is often treated as either a formality or a substitute for process control. For UK buyers of Chinese CNC parts, it is neither. This article explains how to classify machined-part defects, set ISO 2859-1 inspection levels and AQLs, and write a sampling plan into the purchase order without creating false confidence on small or high-value batches.
The Unlisted Machine: How UK Buyers Can Trace Subcontracted CNC Work
Supplier Audits & Quality

The Unlisted Machine: How UK Buyers Can Trace Subcontracted CNC Work

A Chinese CNC supplier can pass work to a partner shop without the UK buyer ever seeing the change on the quotation. The risk is not subcontracting itself, but the loss of visibility over machine capability, inspection discipline and batch traceability. This article sets out how to detect quiet routing through records, process evidence and contract terms.
The Last Process Is the Journey: Specifying Packaging for Chinese CNC Parts
Sourcing & Procurement

The Last Process Is the Journey: Specifying Packaging for Chinese CNC Parts

Packaging is often the only part of a Chinese CNC purchase order left entirely to the supplier, yet rust, edge damage and thread deformation surface at UK goods-in long after the machine has stopped. A one-page packaging schedule turns preservation into a specified, inspectable deliverable.
Before the Chips Are Cut: Approving Material Substitutions on Chinese CNC Parts
Supplier Audits & Quality

Before the Chips Are Cut: Approving Material Substitutions on Chinese CNC Parts

A supplier's 'equivalent' grade is a proposal, not a finding. This protocol sets out how UK buyers can test chemistry, condition, certificates and change control before approving a substitute material for Chinese CNC parts.
The Heat Number Is the Thread: Verifying EN 10204 3.1 Certificates for Chinese CNC Parts
Supplier Audits & Quality

The Heat Number Is the Thread: Verifying EN 10204 3.1 Certificates for Chinese CNC Parts

An EN 10204 3.1 certificate is a useful inspection document, not a material passport. This article sets out how UK buyers can trace heat numbers from mill to finished Chinese CNC part, where the paper chain usually fails, and when independent testing is the sensible next step.
Credit Where It's Due: Settling a Failed Chinese CNC Batch Without Flying Scrap Across the World
Sourcing & Procurement

Credit Where It's Due: Settling a Failed Chinese CNC Batch Without Flying Scrap Across the World

When a Chinese CNC batch fails inspection, the instinct to return it is often the most expensive option available. This article argues for a disposition ladder written into the contract — repair, replace, credit or scrap locally — and explains how warranty wording, evidence packs and scrap authorisation decide which rung you end up on.
A Finish Schedule, Not an Adjective: Writing Cosmetic Requirements for Chinese CNC Parts
Supplier Audits & Quality

A Finish Schedule, Not an Adjective: Writing Cosmetic Requirements for Chinese CNC Parts

Most finish disputes are not quality failures; they are specification failures. This guide sets out how UK buyers can convert vague phrases such as 'black anodised' or 'paint to match' into an auditable finish annex covering colour, texture, inspection lighting, sample boundaries and the distinction between visible and functional surfaces.
Amortised, Not Absorbed: Who Actually Holds the Tooling and CAM Assets When a Chinese CNC Contract Ends
Sourcing & Procurement

Amortised, Not Absorbed: Who Actually Holds the Tooling and CAM Assets When a Chinese CNC Contract Ends

Tooling, fixtures and proven CAM programs are frequently recovered through the unit price rather than invoiced outright, which leaves their legal ownership quietly undefined. This article sets out the asset classes a UK buyer should enumerate in the purchase order, the clauses that make retrieval enforceable, and the practical mechanics of getting the kit back if the relationship ends.
Two Suppliers, One Drawing: Qualifying a Chinese CNC Backup Without Importing a Second Interpretation
Supplier Audits & Quality

Two Suppliers, One Drawing: Qualifying a Chinese CNC Backup Without Importing a Second Interpretation

Dual-sourcing Chinese machining work is a risk-reduction strategy that quietly introduces a new risk: two competent suppliers reading the same drawing in two defensible but different ways. This guide sets out how to split scope by feature criticality, compare first articles across sites on a like-for-like basis, and hold revision control tightly enough that redundancy does not become variation.
The Same Feature, Two Readings: Preventing Unit and Thread Errors in Chinese CNC Drawings
Supplier Audits & Quality

The Same Feature, Two Readings: Preventing Unit and Thread Errors in Chinese CNC Drawings

Most scrap on Chinese CNC parts is not a machining failure; it is a drawing that can be read two ways. Mixed units, pipe-thread shorthand and missing fit classes are the usual culprits. This review sets out how UK buyers can annotate and inspect threads and units so the machinist and the buyer mean the same thing.