On 02/28/2014 07:19 AM, John Alexander Stewart wrote: > Michael; > > Ah - grbl-like input. Makes sense, and I can see how it would not work so > well for LinuxCNC. > > The question, then, is how come Mach3 can have USB cabling, but LinuxCNC > can't? (see the KX* mills from Arc Eurotrade in the UK; now with USB input) > > The reason is Mach gives up close synchronization between PC and motion control, and runs a second or more ahead of the motion control board at the other end of the USB. The USB controller, such as a Smoothstepper, has a buffer in it of future commands to be executed.
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