1. General
  3. General LinuxCNC Questions
  5. Updating 2.8

Updating 2.8

More
13 Nov 2018 13:47 #120539 by andypugh
Replied by andypugh on topic Updating 2.8

the X axis errors with a following error when moving a 60ipm rapid move and it happens as it come close to the end position.


That's typically an acceleration limit miss-match.

Servo or stepper machine?

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 17:06 #120579 by jamby
Replied by jamby on topic Updating 2.8
AndyPugh

s.e.m. servo motor

Jim

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 17:47 #120584 by andypugh
Replied by andypugh on topic Updating 2.8
Probably not accel limits then. That's typically a problem for steppers.

Does your PID have any D term? I think that there has been a change to the command-deriv pin handling in 2.8 (it now works properly)

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 20:33 #120607 by jamby
Replied by jamby on topic Updating 2.8
AndyPugh

Is this what you mean?
setp pid.x.Dgain [JOINT_0]D
but I find no other reference to it.

Jim

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 20:40 #120611 by andypugh
Replied by andypugh on topic Updating 2.8
What is the value of D in the INI file [JOINT_0] section?

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 20:41 #120612 by Todd Zuercher
Replied by Todd Zuercher on topic Updating 2.8
Yes that is where your PID D-term is set in the hal file. That line is referencing a veritable specified in your ini file. Look in the ini file for what the D value is actually set to and to make adjustments.

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 20:50 #120615 by jamby
Replied by jamby on topic Updating 2.8
AndyPugh

P = 30
I = 0
D = 0

That's what I find in the .ini
Not sure what adjustment to make?

Jim

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 20:57 #120616 by andypugh
Replied by andypugh on topic Updating 2.8
If D = 0 then it seems very unlikely that the error you see is due to the changes in the command-deriv pin handling.

Please Log in or Create an account to join the conversation.

More
13 Nov 2018 21:00 #120617 by jamby
Replied by jamby on topic Updating 2.8
AndyPugh

Ok, I lowered the feedrate to 50 and that ended the issue. I really don' t have any reason to travel faster then that for my hobby needs.

Thanks for you help
Jim

Please Log in or Create an account to join the conversation.

More
04 Feb 2019 12:12 #125654 by norbertfarquharsh
Replied by norbertfarquharsh on topic Updating 2.8
I am jumping in here because I also cannot get 2.8. I had tried to update the repository and do not have a clear understanding of the exact editing of the buildbot line.
I have tried various things but am unscuccessful.

Thanks.

Please Log in or Create an account to join the conversation.

  1. General
  3. General LinuxCNC Questions
  5. Updating 2.8
Time to create page: 0.123 seconds
Powered by Kunena Forum