Traj and Display ini section vs min max velocity

hi

Something is unclear for me, why we need to configure min max velocity and acceleration at different place ? and one name not match for traj

doc 2.8 for [TRAJ]
DEFAULT_LINEAR_VELOCITY = 0.0167
DEFAULT_LINEAR_ACCELERATION = 2.0
MAX_LINEAR_VELOCITY = 5.0
MAX_LINEAR_ACCELERATION = 20.0

doc 2.8 Gmoccapy for [TRAJ]
DEFAULT_LINEAR_VELOCITY = 85.0
MAX_VELOCITY = 230.000

doc 2.8 for Display
DEFAULT_LINEAR_VELOCITY = .25
MIN_VELOCITY = .01
MAX_LINEAR_VELOCITY = 1.0
MIN_LINEAR_VELOCITY = .01
DEFAULT_ANGULAR_VELOCITY
MIN_ANGULAR_VELOCITY
MAX_ANGULAR_VELOCITY

Maybe this is not really important but i don't really understand why we can't put this in only one section ?


Br

The result in my setup (started one years ago) are not understandable

my Traj
DEFAULT_LINEAR_VELOCITY = 2.5
DEFAULT_LINEAR_ACCELERATION = 70
MAX_LINEAR_VELOCITY = 70
MAX_LINEAR_ACCELERATION = 50.0

my Display
DEFAULT_LINEAR_VELOCITY = 50
MIN_LINEAR_VELOCITY = 0.5
MAX_LINEAR_VELOCITY = 70
DEFAULT_ANGULAR_VELOCITY = 25
MIN_ANGULAR_VELOCITY = 1
MAX_ANGULAR_VELOCITY = 30

Checking the code
github.com/LinuxCNC/linuxcnc/blob/2.8/sr...pncconf/build_INI.py

for TRAJ i found :
DEFAULT_LINEAR_VELOCITY
MAX_LINEAR_VELOCITY
DEFAULT_ANGULAR_VELOCITY
MAX_ANGULAR_VELOCITY


for DISPLAY
DEFAULT_LINEAR_VELOCITY
MAX_LINEAR_VELOCITY
MIN_LINEAR_VELOCITY
DEFAULT_ANGULAR_VELOCITY
MAX_ANGULAR_VELOCITY
MIN_ANGULAR_VELOCITY


i'm lost

Thanks for reply

I suspect some typo mistake in documentation :
doc 2.8 Gmoccapy for [TRAJ]
MAX_VELOCITY = 230.000 vs MAX_LINEAR_VELOCITY

doc 2.8 for [TRAJ]
DEFAULT_LINEAR_ACCELERATION = 2.0 vs DEFAULT_ANGULAR_VELOCITY
MAX_LINEAR_ACCELERATION = 20.0 vs MAX_ANGULAR_VELOCITY

doc 2.8 for Display
MIN_VELOCITY = .01 need to be removed because we can found the good one at the bottom (MIN_LINEAR_VELOCITY)


edit : i have opened a issue about other possible bad information and speak also about that
github.com/LinuxCNC/linuxcnc/issues/977

FInally i see at man place
DEFAULT_LINEAR_ACCELERATION
MAX_LINEAR_ACCELERATION

SO this is not a typo error but these value seem to be ignored by pncconf

Really in my opinion these parts need to be clarified (maybee only for my own knowledge


It is full needed value like this ?

[TRAJ]
DEFAULT_LINEAR_VELOCITY = 100
MAX_LINEAR_VELOCITY = 300
DEFAULT_ANGULAR_VELOCITY = 25
MAX_ANGULAR_VELOCITY = 30
DEFAULT_LINEAR_ACCELERATION = 70
MAX_LINEAR_ACCELERATION = 150


[DISPLAY]
DEFAULT_LINEAR_VELOCITY = 100
MAX_LINEAR_VELOCITY = 300
DEFAULT_ANGULAR_VELOCITY = 25
MAX_ANGULAR_VELOCITY = 30
MIN_LINEAR_VELOCITY = 0.5
MIN_ANGULAR_VELOCITY = 1

One problem that comes up is these are just variables - it depends on what reads them.

eg [DISPLAY] is for screens and it's up to the GUI builder how he uses them.

[DISPLAY]
DEFAULT_LINEAR_VELOCITY = 100
MAX_LINEAR_VELOCITY = 300
MIN_LINEAR_VELOCITY = 0.5

Generally, by convention, those setting should control the GUI's jog slider.
max slider is set at 300 units per second
min slider is set at .5 units per second
and when started the GUI defaults the slider to 100 units per second.

[TRAJ]
is used internally by linuxcnc IIRC
MAX_LINEAR_VELOCITY = 300
means the fastest speed any joint? axis? can move is 300 units per second

You might want to set the max jog of an axis slower then the absolute max velocity of the machine, and with separate variables you can.

But over the years GUIs have read TRAJ and/or DISPLAY so it can be confusing.
For instance in qtvcp it looks for DISPLAY = MAX_LINEAR_VELOCITY but if it's not there it will look for TRAJ - MAX_LINEAR_VELOCITY and if that is not there it uses it's own default.

We don't don;t have an official INI setting convention for GUIs but most are close.

Chris

Hi

Thanks a lot for this explanation now i understand really better.

But i suspect some typo mistake in documentation :
doc 2.8 Gmoccapy for [TRAJ]
MAX_VELOCITY vs MAX_LINEAR_VELOCITY

doc 2.8 for Display
MIN_VELOCITY = .01
possible that need to be removed because we can found the "imh" good one at the bottom (MIN_LINEAR_VELOCITY)



This setting are only used for non trivial kinematics ?
doc 2.8 for [TRAJ]
DEFAULT_LINEAR_ACCELERATION
MAX_LINEAR_ACCELERATION

Br

looking in the source code (gmoccapy/getiniinfo.py)
Gmoccapy does indeed look at [TRAJ] for jog velocity.
looks for DEFAULT_LINEAR_VELOCITY first and if it can't find it then MAX_LINEAR_VELOCITY.

same for max velocity controls

Then checks [DISPLAY] for:
DEFAULT_ANGULAR_VELOCITY
MAX_ANGULAR_VELOCITY
MIN_ANGULAR_VELOCITY
and
spindle limits, override settings

I see nothing for [DISPLAY] MIN_VELOCITY or [TRAJ] MAX_VELOCITY

I have do some similar checking, i suspect this is only typo error inside documentation that can be changed.

linuxcnc.org/docs/2.8/html/config/ini-co...tml#_display_section
linuxcnc.org/docs/2.8/html/gui/gmoccapy....moccapy:traj-section

imo this does not help for understand lool