Like 'smooth stepper' on ethernet, they buffer the commands and generate accurate timing with an onboard processor. There are at least 3 USB external motion controllers that work fine with mach 3. I have a webcam attached so I can monitor the machine and a wifi USB adapter so I can control and observe the machine remotely. ) specializes in the wholesale distribution of world class cable assemblies for home theater, PC, and high technology. What you cant do is use the USB to parallel port converters. Serial port -1 is the USB emulated serial port, if available. No other USB device attached to the computer causes any problems. Enable this if your board has a secondary serial port. ![]() ![]() The steppers are driven by a separate driver board connected to the computer through a parallel port. The arduino is somehow interfering with at least one axis's steppers when the spindle is switched on since I noticed a creaking noise when I told the arduino to switch on the spindle, and on closer inspection I noticed my Z axis creeping up despite EMC2 (machine controller program) telling me all axes were stationary and I was not running anything. ![]() The program on the arduino reads a byte from the serial port and switches on or off the relay depending on what it reads. The arduino is connected to the CNC computer (a salvaged old computer made in 2005ish with around 1GB of RAM) through a USB port. I set up an arduino connected to a relay which switches the spindle on my CNC machine on or off.
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