![]() Computer manufacturers have eliminated parallel ports, so you need external motion devices to extend pins from your computer’s USB or ethernet. ![]() In this method, you have to buy an external motion device or a breakout board (BOB) for the following two reasons: Mach3 (Mach4) and LinuxCNC use your computer’s motherboard and its parallel port to access it. Arduino boards have many pins for different control tasks. Source: RedditĪll Arduino CNC controllers like GRBL have the same arrangement as industrial controllers: they use a microcontroller, which is like a mini-computer.
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