On 23 May 2013 02:43, Jon Elson <el...@pico-systems.com> wrote:

> Anybody have any ideas or especially experience with a system like
> this?

My only experience comes from reading the mailing lists, forums and
IRC. I have never actually seen a gantry.

There is a kinematics which allows you to independently home two
joints on the same axis to independent home switches.
Called, unsuprisingly, "gantrykins" it lets you map more than one
joint to each axis, and as long as it is configured correctly the two
motors will home independently but simultaneously. It has a number of
issues which make it generally more trouble than it is worth (mainly
to do with world-mode jogging, because as a non-trivial kinematics it
makes a distinction between world-mode and joint-mode)

The problems with gantrykins are, as far as I know, all addressed in
an alternative one-axis -> many-joints kinematics called
"gentrivkins". Unfortunately gentrivkins only works in the
joints_axes3 branch of LinuxCNC (which is currently quite up-to-date,
as far as I know, but isn't available as a package)

-- 
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto

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