Screw-Thread Cutting by the Master-Screw Method since 1480

User: user13
Screw-Thread Cutting by the Master-Screw Method since 1480

 Directness and simplicity characterize pioneer machine tools because

they were intended to accomplish some quite specialized task and the

need for versatility was not apparent. History does not reveal the

earliest forms of any primitive machines nor does it reveal much about

the various early stages in evolution toward more complex types. At best

we have discovered and dated certain developments as existing in

particular areas.

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