Why the circle drawed by "G2 X390 Y-280 I5 J0" not round?

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19 Oct 2021 14:27 - 19 Oct 2021 14:40 #223561 by PCW
Typically the X axis joint would be 0 and the Y axis joint
would be 1 so the following errors would be:

joint.0.f-error
and
joint.1.f-error

(both are pins)
Last edit: 19 Oct 2021 14:40 by PCW.

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21 Oct 2021 02:41 #223753 by curran209
This is joint0 and joint1 f-error figure. It seems they are overlapped.Do their following errors has a problem?
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21 Oct 2021 02:51 #223756 by curran209
But when the speed almost to be fastest that time, it seems has a clearly difference. 
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21 Oct 2021 09:46 #223800 by curran209
 does this following error normal? Can this represent there is a position feedback from drive?
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21 Oct 2021 09:56 #223801 by curran209
and ddt is the meaning of machine unit?

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21 Oct 2021 16:19 #223826 by PCW
The following error is not meaningful unless the drive is
providing the actual feedback position

This hal statement connects LinuxCNC joint 0 position command to the drive:

net Xpos joint.0.motor-pos-cmd => lcec.0.0.TxPositionCommand

This (disabled) hal section looks like it attempts to provide the joint 0
feedback position to LinuxCNC

#net xpos-cmd joint.0.motor-pos-cmd => x_scale_cmd.in
#setp x_scale_cmd.gain [JOINT_0]PSCALE #invert of above
#setp x_scale_cmd.offset 0
#net PosCmdX-Scaled <= x_scale_cmd.out

#net RawPositionFeedback0 lcec.0.0.RxPositionFeedback => x_scale_fb.in
#setp x_scale_fb.gain [JOINT_0]PSCALE_INV #invert of below
#setp x_scale_fb.offset 0
#net xpos-fb joint.0.motor-pos-fb <= x_scale_fb.out

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22 Oct 2021 06:18 #223883 by curran209
Isn't  this sentence the statement that provide the joint 0 feedback position to LinuxCNC?
net Xpos_fb lcec.0.0.RxPositionFeedback => joint.0.motor-pos-fb

looks like i sampled the the joint 0 feedback position to LinuxCNC, it's xpos_fb
     
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22 Oct 2021 15:33 - 22 Oct 2021 15:36 #223927 by PCW

Isn't  this sentence the statement that provide the joint 0 feedback position to LinuxCNC?
net Xpos_fb lcec.0.0.RxPositionFeedback => joint.0.motor-pos-fb

Yes, but that was commented out in your original hal file.

Looks like the X axis drive is poorly tuned
(not following the commanded position)
Last edit: 22 Oct 2021 15:36 by PCW.

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25 Oct 2021 02:43 #224166 by curran209
I provide the joint 0 feedback position to LinuxCNC through this sentence that net Xpos_fb lcec.0.0.RxPositionFeedback => joint.0.motor-pos-fb, and I didn't comment out it.

What's the meaning ddt  on bottom in halscope UI.

I find Xpos_fb's  waveform lags Xpos's waveform 50ms, but y axis hasn't it, what's the reason of this problem generally?
 
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25 Oct 2021 07:57 #224232 by andypugh

What's the meaning ddt  on bottom in halscope UI.

It's the rate of change of the signal at the cursor position. ddt = dX/dt.
 

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