On my first setup with the slave X joint.  I measured the distance and it
was correct.

I switched to using the sample config that John pointed me to.  Starting off
with the one doing no homing.

The setups are pretty much identical except for the gantrykiins and the
settings for the additional axes.

If I move the machine any faster then 50 ipm on any axes than i am getting
joint following errors for that axes.  X gives joint follow errors 0 and 3.
 Y gives joint follow errors 1.  Z gives joint error two.

Any hints on what to try next?  I attached my files I'm usng the Gantry one
is based off the link I got from John.  my-mill1 is the slaved config that
is working with no errors.

(Another issue that might be a bug.  When I have a joint following error.
And I re-toggle machine power.  The next command I give it will have the old
one in as well.  For example.  If my X axis gave a joint error.  I re-toggle
machine power and give it a Y movement.  Then it will do the Y movement as
well as the X... and the X movement will get stuck on and i'll have to hit
the estop.)

Thanks
Bryce


On Sun, Aug 21, 2011 at 9:40 AM, Bryce Johnson <[email protected]> wrote:

> Viesturs, that is true. I should have changed the comments.  A bad comment
> is worse then no comments at all.
>
> I'll check today that it is actually moving the correct distance for each
> command.
>
> John,
> I'll change my setup to follow that config.  It is a whole lot easier to
> understand and looks a lot cleaner.
>
> Thanks
> Bryce
>
>
> On Sun, Aug 21, 2011 at 6:06 AM, John Thornton <[email protected]> wrote:
>
>> There is another config that starts out a bit simpler for gantries but
>> for some reason it is only in master.
>>
>>
>> http://git.linuxcnc.org/gitweb?p=emc2.git;a=tree;f=configs/gantry;h=f3ae14446af4775372c3dd11bcc94ac227bf3fad;hb=HEAD
>>
>> John
>>
>> On 8/20/2011 7:11 PM, Bryce Johnson wrote:
>> > I am in the process of setting up a 4 stepper gantry machine (XYZX).  I
>> > started off using the stepgen and slaving the axis... this appeared to
>> work.
>> >
>> >
>> > This stepup:
>> > Used the gecko 540 selection (i have the 251 which are the same) to get
>> the
>> > correct steptime, stepspace, etc.
>> > Got a base period of 65449 in my INI.  (My jitter is at about 45000)
>> > Scale is 1909.9 steps per inch
>> >
>> > hal looks like this for the X and Y motors
>> >
>> > setp stepgen.0.position-scale [AXIS_0]SCALE
>> > setp stepgen.0.steplen 1
>> > setp stepgen.0.stepspace 0
>> > setp stepgen.0.dirhold 45200
>> > setp stepgen.0.dirsetup 45200
>> > setp stepgen.0.maxaccel [AXIS_0]STEPGEN_MAXACCEL
>> > net xpos-cmd axis.0.motor-pos-cmd =>  stepgen.0.position-cmd
>> > net xpos-fb stepgen.0.position-fb =>  axis.0.motor-pos-fb
>> > net xstep<= stepgen.0.step
>> > net xdir<= stepgen.0.dir
>> > net xenable axis.0.amp-enable-out =>  stepgen.0.enable
>> >
>> >
>> > Now what I want to do is use gantrykins so I can home my X
>> > joints separately.
>> >
>> >   I based my config off of the stepper-gantry in the config. I got it to
>> > run... but when I increase the speed on the X or Y axis EMC will show it
>> > moving faster.  But the motor will be running slow (like it is missing
>> > steps).    This happens around 250 in/min.  Slaving the Xs together I
>> ran it
>> > up to 480in/min
>> >
>> > Any idea would could be the issue?
>> >
>> >    I attached those hal and the INI files.  Not sure if you attach files
>> to
>> > the list?
>> >
>> >
>> >
>> ------------------------------------------------------------------------------
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>> >
>> >
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>>
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>

Attachment: gantry.hal
Description: Binary data

Attachment: gantry.ini
Description: application/wine-extension-ini

Attachment: my-mill1.ini
Description: application/wine-extension-ini

Attachment: my-mill1.hal
Description: Binary data

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