Infinite speed for virtual machine
08 Apr 2021 04:36 #205307
by Nico2017
Infinite speed for virtual machine was created by Nico2017
Hi all,
I am working on a project of simulation where I would like to get linuxcnc running at a feed rate physically impossible. So I do not have any machine hardware limitation and I was wondering if there was somehow a speed limitation due to the software end. If such a limit exist, how does it compare to the thread frequency and frequency of traj planner.
In other words, if I increase the MAX acceleration and MAX velocity values on the .ini file, both in the traj, axis and joints section, am I going to face a speed limitation at some point.
Thank you,
Nicolas
I am working on a project of simulation where I would like to get linuxcnc running at a feed rate physically impossible. So I do not have any machine hardware limitation and I was wondering if there was somehow a speed limitation due to the software end. If such a limit exist, how does it compare to the thread frequency and frequency of traj planner.
In other words, if I increase the MAX acceleration and MAX velocity values on the .ini file, both in the traj, axis and joints section, am I going to face a speed limitation at some point.
Thank you,
Nicolas
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08 Apr 2021 20:03 #205355
by tommylight
Replied by tommylight on topic Infinite speed for virtual machine
I recall pushing a sim to 60m/m, but i also recall pushing a real machine at 68m/m and ripping the belts off ! ![:) :)](/media/kunena/emoticons/smile.png)
What speed are we talking about ?
![:) :)](/media/kunena/emoticons/smile.png)
What speed are we talking about ?
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08 Apr 2021 22:45 #205377
by Nico2017
Replied by Nico2017 on topic Infinite speed for virtual machine
Hi,
well pretty much the highest speed possible, speed of light? Again this is only for a sim.
So I tried: 300000000000 mm/s in all max acceleration, default and max velocity values in joints, axis, and traj planner, which is not taken into account. However 10 000 m/s so 10 000 000 mm/s is. So I was wondering if there would be a speed limitation related to a software bit precision.
Thank you,
Nicolas
well pretty much the highest speed possible, speed of light? Again this is only for a sim.
So I tried: 300000000000 mm/s in all max acceleration, default and max velocity values in joints, axis, and traj planner, which is not taken into account. However 10 000 m/s so 10 000 000 mm/s is. So I was wondering if there would be a speed limitation related to a software bit precision.
Thank you,
Nicolas
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08 Apr 2021 23:25 #205385
by PCW
Replied by PCW on topic Infinite speed for virtual machine
I wonder how fast LinuxCNC/HAL would run without waiting for the next
servo-thread. If it just ran without waiting (but still thought it had a say
1 ms servo thread) you would not need to change any velocity or acceleration
number to get an accurate sped-up simulation, you just lie to LinuxCNC about the time...
servo-thread. If it just ran without waiting (but still thought it had a say
1 ms servo thread) you would not need to change any velocity or acceleration
number to get an accurate sped-up simulation, you just lie to LinuxCNC about the time...
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09 Apr 2021 01:56 #205391
by Nico2017
Replied by Nico2017 on topic Infinite speed for virtual machine
Well at the current high speed tested of 630m/s drawing a 10000mm diameter circle, the halscope runs still fine, just got the axis trajectory display cutting corners.
Playing with high speed, I also need to increase my domain limits to not run of space.
Playing with high speed, I also need to increase my domain limits to not run of space.
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