In terms of the design of the spindle lock, we can see that it is much simpler, and for the spindle itself, it is hard, and the cost of the machine is lower. The KISS principle is here. For fpc1, there is only one way to move: the whole head is moving. If you really want to do this, then you need to buy a drilling machine or go to Las Vegas to play slot machines.
What is the main shaft and the driving system?
The main shaft drive system consists of the spindle motor, the transmission system and the main shaft itself. These parts are designed to be interrelated, so it is best to design them as systems.
Induction motor, servo motor, and dc brush motor are all considered when we are deciding the motor. Considerable complexity and cost have been increased by Servos and their electronic drivers. Our electric brush motor also has problems, the problem is the maintenance problem, in the induction motor, there is almost no standardization here. In terms of value, simplicity, and longevity, fpc6 is definitely the best solution.
Whether to include unlimited speed is another important decision we face. With the development of cheap fpc7 (variable frequency drive), we can see that the complexity of mechanical transmission is no longer reasonable as a solution. In the 1960s, it was mechanical drives that played a big role in fpc6 machines, but they were also common as a point of failure. Solid-state electronics are characterized by low cost and high reliability, rather than mechanical alternatives to infinite resolution speed control.