Why should we Proving Manufacturability with Prototypes？

Many times, the manufacturer's engineers provide the initial part drawing with specific important measurements. However, during the Product Part Approval Process at the OEM's quality department, more critical dimensions might be added. It's crucial for the metal stamper to be aware of all these critical dimensions from the start. This helps them ensure their production process can meet these requirements. If the customized tool for stamping the part is already designed and made, making changes for critical dimensions later could lead to extra expenses.