[EMS Discuss] Why are CNC Kits so Expensive?
Wed Jun 20 14:59:40 PDT 2012
On Wed, Jun 20, 2012 at 2:50 PM, Josh Marinacci <EMAIL HIDDEN> wrote:
> Why does the Parallel Port latency matter? I would think that the computer
> would download the instructions into some sort of board inside the CNC
> machine which does the actual drawing. It seems like 1k of RAM would be
> enough to have a decent buffer of a few instructions.
If you have a dedicated processor driving the motors, then latency at
the host does not matter.
I believe that most parallel port designs are using the PC to drive
the motors directly, so sub-
millisecond timing is necessary.
> Another question: belt and pulley vs threaded rod? What's the better way to
> create linear motion?
I'll look forward to learning that, too. I believe Kassie's RepRap
uses belts for the X and
Y axes and threaded rod for Z.
Bob Miller K<bob>
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