Dead in the water on 7i92 config
16 Feb 2016 14:51 #70235
by PCW
Replied by PCW on topic Dead in the water on 7i92 config
OK, bad latency would expected since this is not a Preempt RT kernel
Here are some instructions for installing a Preempt-RT kernel on the standard LinuxCNC wheezy distribution ISO:
linuxcnc.org/docs/html/getting-started/g...th_preempt_rt_kernel
Here are some instructions for installing a Preempt-RT kernel on the standard LinuxCNC wheezy distribution ISO:
linuxcnc.org/docs/html/getting-started/g...th_preempt_rt_kernel
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17 Feb 2016 07:00 #70280
by dannym
Replied by dannym on topic Dead in the water on 7i92 config
OK, that seems to be it! X and Y don't end up in Following error and move quite quickly!
However, major trouble with the Z-axis (axis 2). It's much slower because of the weight, and only 5 in/sec speed listed. TRAJ is much faster to allow fast X/Y jogging.
But I don't get it. Now Z appears to be trying to go well above its 5 in/sec limit. It may stall, it may generate a "Following Error". Doesn't the TRAJ section still respect the axis limitations?
However, major trouble with the Z-axis (axis 2). It's much slower because of the weight, and only 5 in/sec speed listed. TRAJ is much faster to allow fast X/Y jogging.
But I don't get it. Now Z appears to be trying to go well above its 5 in/sec limit. It may stall, it may generate a "Following Error". Doesn't the TRAJ section still respect the axis limitations?
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22 Feb 2016 13:17 #70475
by andypugh
No, because the Hosmot2 driver communicates only with HAL, and HAL uses a private shared-memory interface rather than the common Linux interfaces.
This might actually make things easier, rather than harder. Your spindle commands already exist in HAL.
Replied by andypugh on topic Dead in the water on 7i92 config
Well is there any way to make it act like a com port right now?
No, because the Hosmot2 driver communicates only with HAL, and HAL uses a private shared-memory interface rather than the common Linux interfaces.
This might actually make things easier, rather than harder. Your spindle commands already exist in HAL.
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01 Apr 2016 06:25 #72506
by dannym
Replied by dannym on topic Dead in the water on 7i92 config
Hope I can get some more help here:
I have gantrykins here. What I'm seeing is that IF you manipulate either of the linked axes (0 or 3) in Joint mode, when you switch to World mode it throws "Following Error" without moving.
So, best guess is that moving one without the other is incorrectly seen as moving the expected location of the second motor, and it somehow doesn't matter in Joint mode but becomes a killer for the PID in World mode and it finds the axes aren't at the same count?
Any ideas how to fix this?
I have gantrykins here. What I'm seeing is that IF you manipulate either of the linked axes (0 or 3) in Joint mode, when you switch to World mode it throws "Following Error" without moving.
So, best guess is that moving one without the other is incorrectly seen as moving the expected location of the second motor, and it somehow doesn't matter in Joint mode but becomes a killer for the PID in World mode and it finds the axes aren't at the same count?
Any ideas how to fix this?
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01 Apr 2016 13:31 #72525
by PCW
Replied by PCW on topic Dead in the water on 7i92 config
use trivkins and the gantry comp for homing instead of fighting gantrykins?
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02 Apr 2016 00:50 #72539
by dannym
Replied by dannym on topic Dead in the water on 7i92 config
Well, there's 2 other requirements.
One, independent homing to correct for racking.
Second, I have an XHC-HB04 mpg. I was trying to set it up but heard that gantrykins can't support "incremental jogging" mode that uses.
I'm not sure of what solution can do what.
One, independent homing to correct for racking.
Second, I have an XHC-HB04 mpg. I was trying to set it up but heard that gantrykins can't support "incremental jogging" mode that uses.
I'm not sure of what solution can do what.
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02 Apr 2016 00:53 #72541
by andypugh
Replied by andypugh on topic Dead in the water on 7i92 config
The gantry comp does independent homing (I think)
As it uses trivkins, it will jog with the XHC.
As it uses trivkins, it will jog with the XHC.
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02 Apr 2016 01:07 #72542
by dannym
Replied by dannym on topic Dead in the water on 7i92 config
I couldn't get gantrykins to move the axis in World mode (teleops), just Joint mode. I was told that's a known limitation of gantrykins. Which IS weird, since Y and Z aren't even linked. Just X.
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02 Apr 2016 01:20 - 02 Apr 2016 01:21 #72543
by dannym
Replied by dannym on topic Dead in the water on 7i92 config
I couldn't get gantrykins to move the axis in World mode (teleops), just Joint mode. I was told that's a known limitation of gantrykins. Which IS weird, since Y and Z aren't even linked. Just X. But none of them would move in World mode, all moved in Joint mode.
Last edit: 02 Apr 2016 01:21 by dannym.
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02 Apr 2016 02:22 #72549
by Todd Zuercher
Replied by Todd Zuercher on topic Dead in the water on 7i92 config
How were you trying to move them? If you were trying to move them with an incremental jog command. Incremental jogging doesn't work in world mode.
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