alagi Wrote:
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> Hello!
>
> First of all, nice work!
>
> I think all this talk about having to have a
> simple math is irrelevant.
> One can write a script to convert the xyz paths
> that the slicer prints out to whatever geometry
> before printing, on the computer. (this script
> should split straight lines to small segments,
> because straight lines in xyz geometry are
> tipically not straight lines in other geometries)
> Than one can just use almost the regular Marlin or
> whatever. (only homeing needs to be changed)
It depends on how much preprocessing you want to do. In addition acceleration planning needs to take into account the real geometry. Suffice it to say that it's not even relevant since the architecture with the simpler math is simpler to build and calibrate too ;)
> I also have a question: What I don't see on this
> new design, how the steppers move the arms? Is
> there some spectra line or some belt which is not
> included on the pictures?
nicholas.seward has not drawn in the 80lbs test fishing line which will be used. It connects from the stepper to the top of the arm that connects to the base, then loops around the pulley on the arm that connects to the toolhead. You'll note that he talks about using a block and tackle, which means that the precision can be increased by looping more fishing line, or that a weaker stepper motor can compensate with more loops.
-------------------------------------------------------
> Hello!
>
> First of all, nice work!
>
> I think all this talk about having to have a
> simple math is irrelevant.
> One can write a script to convert the xyz paths
> that the slicer prints out to whatever geometry
> before printing, on the computer. (this script
> should split straight lines to small segments,
> because straight lines in xyz geometry are
> tipically not straight lines in other geometries)
> Than one can just use almost the regular Marlin or
> whatever. (only homeing needs to be changed)
It depends on how much preprocessing you want to do. In addition acceleration planning needs to take into account the real geometry. Suffice it to say that it's not even relevant since the architecture with the simpler math is simpler to build and calibrate too ;)
> I also have a question: What I don't see on this
> new design, how the steppers move the arms? Is
> there some spectra line or some belt which is not
> included on the pictures?
nicholas.seward has not drawn in the 80lbs test fishing line which will be used. It connects from the stepper to the top of the arm that connects to the base, then loops around the pulley on the arm that connects to the toolhead. You'll note that he talks about using a block and tackle, which means that the precision can be increased by looping more fishing line, or that a weaker stepper motor can compensate with more loops.