What process can be used to very accurately make moulds and why must these be rigorously checked compared to a standard part?

What process can be used to very accurately make moulds and why must these be rigorously checked compared to a standard part?

• A. CNC milling with 0.01mm tolerance; checks are routine
• B. Electric discharge machining (EDM) can be used with 0.002mm accuracy, these must be checked more as the part requires a very high level of accuracy
• C. Injection moulding must be checked
• D. 3D printing can achieve 0.05mm accuracy

Answer: (B)

Extremely tight dimensional control in mould tooling is essential because the mould defines the size and surface finish of every part produced, so it has to be checked very rigorously against the design. EDM (electrical discharge machining) can erode metal with exceptional precision, enabling the tiny, accurate cavities and complex shapes required for high-quality moulds. Since any small error in the mould is replicated in every part, the mould must be measured against the specification with high-accuracy metrology, typically using tools like a CMM or laser scanning to confirm it matches the CAD model. The rigorous checks ensure part quality, fit, and wear performance are not compromised. Other options don’t offer the same precision: CNC milling can achieve good tolerances but not the same level of accuracy as EDM for mould cavities; injection moulding is the production process, not the tooling method; and although 3D printing can prototype tooling, it generally can’t deliver the necessary precision and surface finish for production moulds.

Extremely tight dimensional control in mould tooling is essential because the mould defines the size and surface finish of every part produced, so it has to be checked very rigorously against the design. EDM (electrical discharge machining) can erode metal with exceptional precision, enabling the tiny, accurate cavities and complex shapes required for high-quality moulds. Since any small error in the mould is replicated in every part, the mould must be measured against the specification with high-accuracy metrology, typically using tools like a CMM or laser scanning to confirm it matches the CAD model. The rigorous checks ensure part quality, fit, and wear performance are not compromised. Other options don’t offer the same precision: CNC milling can achieve good tolerances but not the same level of accuracy as EDM for mould cavities; injection moulding is the production process, not the tooling method; and although 3D printing can prototype tooling, it generally can’t deliver the necessary precision and surface finish for production moulds.