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  5. Updating 2.8

Updating 2.8

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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?

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

s.e.m. servo motor

Jim

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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)

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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

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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?

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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.

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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

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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.

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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

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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.

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