Absolute linear scales
30 Aug 2016 20:27 #79748
by andypugh
Replied by andypugh on topic Absolute linear scales
Guess what I suggest next?
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31 Aug 2016 07:03 #79766
by terkaa
Replied by terkaa on topic Absolute linear scales
I believe I do know
My next question is official releasing of 2.8 far away?
Tero
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Tero
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31 Aug 2016 08:00 #79767
by andypugh
Replied by andypugh on topic Absolute linear scales
I think that 2.8 is some way off.
We are still shaking out bugs. It needs more testing, and you might be the only one with the hardware to test absolute feedback scales.
So, I would encourage you to switch and report any issues.
We are still shaking out bugs. It needs more testing, and you might be the only one with the hardware to test absolute feedback scales.
So, I would encourage you to switch and report any issues.
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31 Aug 2016 09:00 #79770
by terkaa
Replied by terkaa on topic Absolute linear scales
Ok, I will consider this. If I decide to give it a go, I will replace harddrive and copy my config folder there after fresh install. That way reverting back to 2.7 is easy.
Tero
Tero
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31 Aug 2016 11:24 #79773
by terkaa
Replied by terkaa on topic Absolute linear scales
I decided to get another similar PC for this tryout it is even easier to swap in and out than HD. I started a new thread under installing LinuxCNC because it goes slightly off topic.
Tero
Tero
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21 Sep 2016 06:59 - 21 Sep 2016 07:54 #80710
by terkaa
Replied by terkaa on topic Absolute linear scales
Hmmm.... I have this problem:
Commanded position G54 Y -35. And machine position at -34.976 there is a 0.024mm difference always. If commanded is Y-100. it is positioned at -99.976 What might cause this?
Tero
Commanded position G54 Y -35. And machine position at -34.976 there is a 0.024mm difference always. If commanded is Y-100. it is positioned at -99.976 What might cause this?
Tero
Last edit: 21 Sep 2016 07:54 by terkaa.
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21 Sep 2016 08:18 #80714
by terkaa
Replied by terkaa on topic Absolute linear scales
Modified NC program so that Y-35 position command is Y-35.024 And now actual position is -35.000 where does this +0.024mm come from?? It is same with 2.7.6 with NO_FORCE_HOMING and 2.8.0 pre1 with ABSOLUTE_ENCODER_HOMING = 2
Tero
Tero
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21 Sep 2016 17:32 - 21 Sep 2016 17:34 #80726
by andypugh
What is the position if you approach from the other side of 100?
What is the basic resolution of your scales? If the number was 0.0254mm I would have guessed 1/1000 in.
Replied by andypugh on topic Absolute linear scales
Hmmm.... I have this problem: Y-100. it is positioned at -99.976 What might cause this?
What is the position if you approach from the other side of 100?
What is the basic resolution of your scales? If the number was 0.0254mm I would have guessed 1/1000 in.
Last edit: 21 Sep 2016 17:34 by andypugh.
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21 Sep 2016 17:36 - 21 Sep 2016 17:57 #80727
by terkaa
Replied by terkaa on topic Absolute linear scales
I am quite sure position is same regardless of approach direction(I will confirm this tomorrow). Linear scale give resolution of 0.00001mm and Servos have 0.0002 resolution(encoder for servo amplifier only not connected to LinuxCNC). Also I can move to any position with steps of 0.001mm with MPG. If this was a problem with resolution would commanding Y-100.024 result in a position of -100.000 ?
Tero
Tero
Last edit: 21 Sep 2016 17:57 by terkaa.
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21 Sep 2016 18:55 #80731
by PCW
Replied by PCW on topic Absolute linear scales
Is this an error in commanded position or actual position?
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