2011/10/28 Tom Easterday <tom-...@bgp.nu>:
>
> If you are perfect at pushing both buttons at once, MAYBE you could do that.
> I cannot do that even at 45in/min without racking the gantry.

Since You have shared zero information about the machine, its
construction and purpose, my opinion is based in my own experience -
the constructions of those gantry machines I have worked on are
flexible enough that even few centimeters back or forth on one gantry
side do not cause any damage to construction, so jogging both joints
together by holding 2 buttons is not a problem, because I am sure that
any operator can press both buttons within 0.2 seconds.

AFAIK jogging before homing is done, only to save time, when current
machine position is relatively far from its home position and it would
take a long time for machine to go home with home search velocity
(given that machine construction and config is set up properly, homing
sequence is indicated correctly, so that machine can always find its
home in a safe manner without a risk to hit something in its way).
If that is Your case, I think it would be obvious to eliminate the
need for jogging and move machine closely to home position before
shutting it down. One easy way to do that is to introduce VCP button,
that tells the machine to go (almost) home, so after finishing work
operator can easily move machine to a position, from which it can home
quickly and easily.


> But things have been working (mostly).  I don't have an A axis, or a V axis 
> or any other axis.
> I have X Y and Z.  Are you saying there is a bug that requires a fourth 
> letter?
> And if so, what is the manifestation of that bug, cause I haven't seen it….?

I am saying that gantry config is very nice example, where axis vs.
joint concept is demonstrated. And currently in EMC2 both these
conventions are mixed up in many places and used interchangeably (and
thus creates a lot of confusion) - in INI file AXIS_N actually should
read as JOINT_N, because those parameters are applied to particular
joints, without regard to kinematics and which Cartesian axis they
really are "connected" to.

Jonts_axes3 branch is the place, where these things are gradually
sorted out. Unfortunately my programming skills are so low, that I do
not really understand, what is the progress there - I have been
looking through different commits in that branch, but do not really
understand much of the stuff I can see :))


> Also, wouldn't doing that require me to then go edit my hal and ini file to 
> rename the (imaginary) axes configuration sections?  I don't want to have to 
> do that…

Based on tiny details You have shared about Your config - no. It
_should_ be fine.

Viesturs

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