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

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14 Oct 2021 05:41 #223057 by curran209
We use laser to draw circle on a aluminum sheet. Trajectory planning is round, but the circle drawed is not round.
Why the circle drawed by "G2 X390 Y-280 I5 J0" not round?
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14 Oct 2021 11:53 #223077 by tommylight
Very low acceleration or mechanical issues.

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14 Oct 2021 12:16 #223080 by RNJFAB
x & y axis not square

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14 Oct 2021 16:01 #223094 by andypugh
This could be simple geometry. Is the laser controlled by a galvanometer or is it moving on a cartesian axis?

If it is a galvanometer then the only place that a circle will be circular is exactly under the centre of the galvanometer.

This can presumably be corrected by a kinematics module.

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15 Oct 2021 01:18 #223145 by curran209
The laser binded on the Z axis. Laser is on all the time. Draw this circle by moving the X and Y axis of servo motor.

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15 Oct 2021 03:35 #223159 by curran209
@tommylignt I increased acceleration, but it didn't to be good.
Excluded mechanical issues, because another CNC has not this issue.

@RNJFAB x & y axis is square

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15 Oct 2021 07:26 #223175 by andypugh
Can you use Halscope to plot the X and Y following errors?

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18 Oct 2021 08:45 #223440 by curran209
sorry, can you tell me how to download Halscope and use it?

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18 Oct 2021 12:12 #223448 by andypugh
It's part of LinuxCNC.

linuxcnc.org/docs/2.8/html/hal/tutorial....ec:tutorial-halscope

Most GUIs can open it from the menu, or you can open it from the command line as described above.

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19 Oct 2021 08:58 #223536 by curran209
what is  the variable name of x axis and y axis following errors in halscope?
which is the selection of x axis and y axis following errors  in in pin, signal, param?
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