Engineering & ManufacturingCNC · Sheet Metal · Stamping · Rapid Prototyping
Questions & answers
CNC machining, sheet metal and prototyping FAQ
Short answers to the questions buyers and engineers ask us most about machined, sheet metal and prototype parts. If yours is not here, send it with your drawing and we will answer it for that part.
Frequently asked questions
What services do you offer?
CNC machining (milling, turning, Swiss-type turning, grinding, EDM), sheet metal fabrication, metal stamping, rapid tooling, 3D printing, vacuum casting and surface finishing.
What files do you need for a quotation?
A 3D model in STEP or IGES format and a 2D drawing in PDF with tolerances, plus the material, finish, quantity and required date.
Do you make prototypes and small batches?
Yes. CNC machined prototypes run from 1 to 500+ pieces; 3D printing, vacuum casting and rapid tooling cover plastic prototypes and short runs.
Which materials can you work with?
Aluminum, stainless steel, carbon and alloy steel, tool steel, brass, copper, titanium and engineering plastics such as POM, nylon, ABS, PC, PMMA and PEEK.
What finishes are available?
Deburring and polishing, anodizing, electroplating, powder coating, painting, passivation and heat treatment.
What tolerances do you work to?
The tolerances on your drawing. Where none are given, a general standard such as ISO 2768-m is typically applied. Mark the critical features and we confirm them before quoting.
Do you inspect the parts?
Yes. Parts are inspected against the drawing under our ISO 9001 quality system, with CMM measurement where needed. First article and dimensional reports can be supplied on request.
Can you finish and assemble parts?
Yes. Finishing, inserts, welding and assembly can be included in the order so parts arrive ready to use.
Where are you located?
China United Mould has plants in Huizhou and Dongguan, Guangdong, China.