Positioning issue on remora with nvem

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03 Aug 2024 12:58 #306842 by Lpkkk
Hi 
I've got some weird issue with my configuration. 
When I home I should be on X0Y0. But I'm always 0.003 - 0.005 from this point on both axes. 

Same when I go to X50, it is stopping at 49.995. DTG shows 0. 
I've noticed in hal config that j0pos-cmd and j0pos-fb are different. 
It happens on all of the axes 
​​​Can someone advise anything? 
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06 Aug 2024 03:04 #307053 by scotta
Replied by scotta on topic Positioning issue on remora with nvem
With a stepper based system you will be limited by the distance moved by one step. In the example you have shown your step scale is 160, ie 160 steps / mm. Therefore 1 step is 0.00625mm

The difference between the commanded and actual position is 0.0063mm (0.00625) or one step. The default deadband within the Remora component is 1/step_scale or 1 step. You can set the deadband to be smaller but then the control loop will hunt as the step resolution never allows the commanded position to be reached.

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06 Aug 2024 14:57 #307096 by Lpkkk
Replied by Lpkkk on topic Positioning issue on remora with nvem
I've tried different deadband settings by adding to my hal :

setp remora.joint.0.pgain [JOINT_0]P_GAIN
setp remora.joint.0.ff1gain [JOINT_0]FF1_GAIN
setp remora.joint.0.deadband [JOINT_0]DEADBAND

And to my ini in joint 0 section :

P_GAIN = 1
FF1_GAIN = 1
DEADBAND = 0.001

I've tried different values like 1, 0.5, 1.1, all of them didn't change anything.

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06 Aug 2024 19:23 - 06 Aug 2024 19:31 #307118 by Lpkkk
Replied by Lpkkk on topic Positioning issue on remora with nvem
With those settings(attached) i'm nearly there. Sometimes it is spot on, but sometimes like on the screenshot
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Last edit: 06 Aug 2024 19:31 by Lpkkk.

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