Limited velocity

Hello everyone!

I'm trying to use LinuxCNC to cut foam. My hotwire cutter has X Y U V axes.

My only problem is that the velocity is somehow limited to 60mm/min. With the feed override slider you can lower the velocity but not increase. I know foam cutter doesn't need much speed but I would like to have some more.

When I create a new 3 axis machine with the stepconf wizard, you can increase the speed as you like. But when I add the FOAM=1 and XYUV stuff in the INI file the 60mm/min limit pops up again. Any idea why?

Hi

You can have your velocity set to whatever you like, irrespective of whether the machine can actually achieve it.

Without seeing your .ini file hard to say where the problem lies.

Have a look at linuxcnc.org/docs/2.5/html/config/ini_config.html

There are a confusing number of possible velocity settings and if you had
[DISPLAY]
MAX_LINEAR_VELOCITY =
set to one thing and your axes to another, that could do it

regards

There are a confusing number of possible velocity settings...

You are right about that!

I tried to fiddle with various velocity settings without any luck. I attach my .ini file to this post. BTW I'm using Linuxcnc 2.6.0.

Hi

I can't actually see anything wrong with it.

I used your .ini instead of that in the sim and this is what I get.
It is as I would expect, because your MAX_VELOCITY is set to 25mm/sec (25x60 = 1500mm / min)




regards

Hi,

What happens if you press that + button? Are you able to get velocity value over 60?

Hi

I found the problem - eventually

The axes are notated in the .ini file as [AXIS_X] , [AXIS_Y] etc
I have not seen this before, haven't used stepconf for years, so maybe that is what is produced now.

If you substitute the joint number, so that it becomes [AXIS_0], [AXIS_1] etc. it works as it should, with jogs up to 1500mm/min .

Attached the .ini file I used to test in the sim, along with all the other VELOCITY settings filled in, which you can adjust or remove as you wish


regards

Thank you so so much! Works like a charm.

I saw a .ini file some time ago with [AXIS_ 'letter of the axis'] and thought that is more easier to read than numbers. So I changed numbers to letters. Didn't notice the velocity drop back then.

Thanks again for your work. Really appreciate.

Don't know about any documentation about that but I got it here.

In the comments.