I haven't tried it yet, but this looks promising.
LinuxCNC S-Curve Accelerations
Scott H
On Tuesday, August 17, 2021, 12:57:06 PM CDT, Ralph Stirling
wrote:
I've also been hoping to see this appear in a Linuxcnc update,
as it has been worked on by a number of people for years.
I've also been hoping to see this appear in a Linuxcnc update,
as it has been worked on by a number of people for years.
Here are the most recent threads about jerk-limited trajectory planning:
https://forum.linuxcnc.org/24-hal-components/40152-jerk-limited-trajectory-planner-hal-component
I don't have a great need for it with my machines, or the time/brains to
implement it. It just seems like a feature we really should have.
I'd be willing to participate monetarily in some sort of system to
incentivize the inclusion of jerk control. Perhaps an open-source feature
bounty?
tormach did something to the planner, does anyone know what they paid for
it, and how / who they commissioned to do it?
On Tue, 17 Aug 2021, 18:57 Ralph Stirling,
wrote:
> I've also been hoping to see this appear in a Linuxcnc update,
> as it has been worked on by a number of people for years.
I am going to ask a stuid question.. If you have a velocity run step gen
with pid. Couldn't you hook a limit3 between the pid and steghen.
Because the input is velocity instead of position - wouldn't the
acceleration limit in the limit3 be jerk instead of acceleration? I am
sure it doesn't
Default is 50... These are what can be tweeked in the tp..
http://linuxcnc.org/docs/2.8/html/config/ini-config.html#sec:traj-section
On Tue, Aug 17, 2021, 8:49 PM Feral Engineer
wrote:
> I'm curious what the current level of block lookahead is on lcnc compared
> to commercial controls.
Not sure Sam.
I have a 7i77 on this mill though also. So analog control
On Wed, Aug 18, 2021, 12:51 PM Sam Sokolik wrote:
> I am going to ask a stuid question.. If you have a velocity run step gen
> with pid. Couldn't you hook a limit3 between the pid and steghen.
> Because the input is
It would be the same setup... Just using servo amps.. Velocity out of
the pid - position back from the encoders.
On Tue, Aug 17, 2021, 8:14 PM andrew beck wrote:
> Not sure Sam.
>
> I have a 7i77 on this mill though also. So analog control
>
> On Wed, Aug 18, 2021, 12:51 PM Sam Sokolik
Well if anyone has some time examples on how this would work I can make a
test config on my machine
On Wed, Aug 18, 2021, 1:36 PM Sam Sokolik wrote:
> It would be the same setup... Just using servo amps.. Velocity out of
> the pid - position back from the encoders.
>
> On Tue, Aug 17, 2021,
I think 250 lines a head rings a bell
On Wed, Aug 18, 2021, 1:49 PM Feral Engineer
wrote:
> I'm curious what the current level of block lookahead is on lcnc compared
> to commercial controls. Anyone know the amount of data buffering that it
> can handle?
>
> Phil T.
> The Feral Engineer
>
>
This is what we're talking about right?
Ramping acceleration?
https://www.mmsonline.com/articles/understanding-jerk-control
John
> -Original Message-
> From: Feral Engineer [mailto:theferalengin...@gmail.com]
> Sent: August-17-21 6:46 PM
> To: Enhanced Machine Controller (EMC)
>
I'm curious what the current level of block lookahead is on lcnc compared
to commercial controls. Anyone know the amount of data buffering that it
can handle?
Phil T.
The Feral Engineer
Check out my LinuxCNC tutorials, machine builds and other antics at
www.youtube.com/c/theferalengineer
Help
Here is the text from your link sam
Ramped velocity in this case just means constant acceleration over the
whole segment. This is less optimal than a trapezoidal velocity profile,
since the acceleration is not maximized. However, if the segment is short
enough, there isn’t enough time to
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