Sourcing precision CNC machined parts from China can deliver significant cost savings, but only if you manage the process carefully. Here are the key areas I focus on with every client to ensure parts arrive on spec and on time.
1. Start with Complete, Clear Drawings
The #1 cause of sourcing delays and quality issues is incomplete drawing packages. Before sending an RFQ, make sure you have:
- A 3D model (STEP or IGES format preferred)
- A 2D drawing with all critical dimensions and tolerances
- Material specification (grade, temper, finish)
- Surface finish requirements (Ra values)
- Any secondary operations (anodizing, plating, heat treatment)
2. Ask the Right Questions During Quotation
A low quote is not always the best quote. When comparing suppliers, ask:
- What is the machine capability (3-axis, 4-axis, 5-axis)?
- What tolerance can they consistently hold?
- Do they provide first-article inspection reports?
- What is their defect rate for similar parts?
3. Inspect Before Shipment
Never skip the pre-shipment inspection. A dimensional report from the factory is not enough — arrange an independent inspection or have someone on the ground verify the parts against your drawings.
4. Plan for Lead Times Realistically
Typical CNC machining lead times:
- Prototype (1–10 pcs): 1–2 weeks
- Low volume (50–500 pcs): 2–3 weeks
- Mass production (1,000+ pcs): 3–4 weeks
Always build buffer time into your project schedule, especially for first-time orders.
Have questions about a specific sourcing project? Get in touch and I’ll be happy to help.