G0 velocity limitation

Okay, I tried as you suggested and just to be sure I wasn't using the proper ini file I am outlining the steps I followed specifically.

Using the Live CD and installed Linuxcnc on a different computer from what I am using on my Bridgeport mill.
Open Application->CNC->LinuxCNC
Select from "Linux CNC Configuration Selector"
Stepper->sim_inch, OK
See window to copy to my home directory,, I select "yes", and see msg "Configuration copied" I select OK
Axix window opens, I home all axes, go to MDI and issue commands:

G0X1 - expected the DRO to say Vel: 72, and it did
G0Y1 - expected the DRO to say Vel: 72, and it did
G0Z-1 - expected the DRO to say Vel: 72, and it did

I then closed the Axis window and opened Gedit and opened the file jack/linuxcnc/configs/stepper/sim_inch.ini
I changed the axes max vel as follows:

AXIS_0 MAX_VELOCITY from 1.2 to 0.6
AXIS_1 MAX_VELOCITY from 1.2 to 0.4
AXIS_2 MAX_VELOCITY from 1.2 to 1.0

I then saved the file and opened up:
Open Application->CNC->LinuxCNC
Selected My Configuration->sim_inch
Homed the axes, went to MDI and issued the commands

G0X1 - expected the DRO to say Vel: 36, and it did
G0Y1 - expected the DRO to say Vel: 24, and it did
G0Z-1 - expected the DRO to say Vel: 60, and it didn't, It read 36

The above procedure is essentially verbatum of all the steps I took. Did I error somewhere?
This is on a different PC than is running my Bridgeport.
So I don't understand what is going on.
I wish I could duplicate your results.

jensor

In my previous post I forgot to mention position of my sliders.

The sliders were left in the default positions which were:

Feed override: 100% not quite all the way to the right
Jog speed: 72 ipm slider full to the right
Max Velocity: 36 ipm slider full to the right

jensor

Ok I tried the sim that you used and got the same result as you.

So what is causing the difference between the 2 sims?

configs/sim/axis/axis.sim vs configs/sims/sim_inch

jensor

That still isn't the answer. In the file sim_inch.ini

[TRAJ] MAX_VELOCITY = 1.2 DEFAULT_VELOCITY = 1.2

These are the default settings. I tried increasing [TRAJ] MAX_VELOCITY = 2.0

and the Max velocity slider stil was full right at 36.

I then tried changing [AXIS_0] Max_VELOCITY
to 1.0.

I find now the slider is now full right at 60!

jensor

Take a look at.....

MAX_LINEAR_VELOCITY =

Not just...

MAX_VELOCITY =

Rick G

Hey - That resolved the issue completely.

I saw that in the default files the [TRAJ] MAX_LINEAR_VELOCITY statement is present in axis.ini while in inch.ini it was omitted. I suppose it was an unintenional oversight that could be corrected in future releases. At the least it could be shown commented out.
or
Is there a universal ini file showing all the options with explanations?

In the Integrator manual under the TRAJ section showing all the options fails to mention this one.

Thanks for all the support.

jensor

Glad you got it sorted out!

Have you looked here?

www.linuxcnc.org/docs/devel/html/config/ini_config.html

Rick G

Yes I looked there. There is no mention of MAX_LINEAR_VELOCITY.

jensor