This is a stepper system, trivkins, 3 axis mill.
I kind of assumed that the tuning in pncconf is using the configuration
that it will write, it's not very useful if one tunes things but then
the parameters to use are different...
so you are referring to these
*
/STEPGEN_MAXACCEL = 21.0/- Acceleration limit for the step
generator. This should be 1% to 10% larger than the axis
MAX_ACCELERATION. This value improves the tuning of stepgen's
"position loop". If you have added backlash compensation to an axis
then this should be 1.5 to 2 times greater than MAX_ACCELERATION.
*
/STEPGEN_MAXVEL = 1.4/- Older configuration files have a velocity
limit for the step generator as well. If specified, it should also
be 1% to 10% larger than the axis MAX_VELOCITY. Subsequent testing
has shown that use of STEPGEN_MAXVEL does not improve the tuning of
stepgen's position loop.
looking at the hostmot driver
*
/maxaccel/- (Float, RW) Maximum acceleration, in position units per
second per second. If set to 0, the driver will not limit its
acceleration.
*
/maxvel/- (Float, RW) Maximum speed, in position units per second.
If set to 0, the driver will choose the maximum velocity based on
the values of steplen and stepspace (at the time that maxvel was set
to 0).
seems like it would be best to specify 0 for both of those as the per
axis limits would still be in place ?
I am going to play with that and see... thanks for the reply
On 2/9/14 4:04 PM, emc-users-requ...@lists.sourceforge.net wrote:
> Date: Sun, 9 Feb 2014 15:03:40 +0000
> From: andy pugh<bodge...@gmail.com>
> Subject: Re: [Emc-users] mesa 5i25, pncconf working but not linuxcnc
> To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> Message-ID:
> <CAN1+YZV2iQb-AQmWE4TYbxithWSFmSvuMRP-kxk8=jhwpjd...@mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 9 February 2014 11:30, bruno<br...@tinkerbox.org> wrote:
>
>> >After configuring, I started linuxcnc (with tklinuxcnc as I have opengl
>> >issues with axis right now), and it immediately gives me joint following
>> >errors. No move, nothing.
> It might be that Pncconf doesn't teack following error, or has higher limits.
>
> However, if this is a stepper system then "following error" means
> something slightly different to what it means in a servo system. It
> means that the system has not been able to make the number of steps
> requested.
>
> What this typically means is that the system stepgen accelleration
> numbers are bigger than the step generator limits. Have a look through
> your INI file and check that the step-generator accel limits are "a
> bit" higher than the system and axis limits.
>
> Is the machine a gantry system? The other possibility is that the
> step-generator feedback is going to the wrong axis.
>
> -- atp If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
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