Re: homing and axis errors

[Jon Elson <jmelson-at-artsci.wustl.edu>]

garrett beaubien wrote:

> Still need to work on that though.  I guess that what
> I was trying to do was to just get this thing working
> to the point where I could start EMC, click 'home',
> rotate the shaft, and see the display update.

Don't try to use the home function unless you have
home switches (or you know that the computer will be
reading the unconnected pins as home switch closed).
Just start EMC and the GUI, and you should see the
position display change whan you move the shaft.

>  Then I
> was thinking I'd look into why my output doesn't work.
> After reading your response, I'm starting to realize
> why it wouldn't work.  Dont know why, but I thought
> that the 'home' button might cause the current
> position to become zero (home), but that's stupid,
> because what would be the point of having a home
> switch?

There are two things that you need to do, but don't bother
with the home stuff.  First, press F1, which sets the current
position as the place to hold at until further commands and
sends a signal to turn on the servo amps (coming out of
E-stop).  Then, press F2, which goes to state 'Machine On',
and sends a signal to enable the servo amps, and causes
the DAC to output the result of the PID calculation.
If you haven't pressed F2, you won't get any servo
output to the amps.

Jon