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What are the deficiencies of mechanical spring machines?

Update:15 Jun 2019
Summary:

1, Wire feeding accuracy / length In terms of power sou […]

1, Wire feeding accuracy / length
In terms of power source, the mechanical spring machine's wire feeding power uses ordinary three-phase/single-phase motors, which are characterized by uncontrolled angle.
2, Electromagnetic clutch / one-way clutch
Due to the structure of the mechanical spring machine, it is necessary to install a brake device to ensure that the clutch is stopped immediately, that is, the wire feeding operation is stopped, but it cannot accurately achieve this and the accuracy is lowered, and the clutch is often the damage of the machine.
3. The wire feeding and forming power are from the same motor.
During the wire feeding process, the forming cam is also continuously operated to form a cutting operation, so that the wire feeding length is also limited, and the production of a long spring of a special specification cannot be realized.