The supplier offers a total solution to deliver industrial machinery. It is common that the customer specifies what capabilities the machine needs to have and then the supplier engineers a machine to meet those requirements. Most machines contain machined and fabricated parts, electronics, and glass, rubber and plastic components. The supplier also assembles the machine.
The exact process of making special purpose machines is different in every case, and suppliers have to work closely with its customer. Special purpose machines are manufactured by workshops with special skills, but they usually do regular manufacturing as well.
Compare special purpose machines to complete manufacturing, where many processes are used to deliver a product.