LinuxCNC S-Curve Accelerations

PCW
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09 Jan 2026 03:41 - 09 Jan 2026 14:58 #341190 by PCW

Replied by PCW on topic LinuxCNC S-Curve Accelerations

it was true:

16 bit IN TRUE ini.traj_arc_blend_enable

I was running the torus gcode (from the torus.png --> image to gcode with whatever defaults)

EDIT: here's the gcode that triggered the bug:

File Attachment:

File Name: torus.ngc
File Size:51 KB

Last edit: 09 Jan 2026 14:58 by PCW.

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grandixximo
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09 Jan 2026 05:44 #341192 by grandixximo

Replied by grandixximo on topic LinuxCNC S-Curve Accelerations

You are right, my apologies, I was looking at it on my phone, and it formatted it intuitively. We'll be looking into it, thank you for reporting

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endian
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09 Jan 2026 07:46 - 09 Jan 2026 07:55 #341197 by endian

Replied by endian on topic LinuxCNC S-Curve Accelerations

next testing round in 3d contouring, 25k line and later are critial and we can observing high accel-cmd peaks ... I am not expert, I need to ask you guys before create any outcomes... I can chare gcode file but here it exceeding limit

Last edit: 09 Jan 2026 07:55 by endian. Reason: editor messing - picture of scope was not present

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grandixximo
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09 Jan 2026 08:40 #341199 by grandixximo

Replied by grandixximo on topic LinuxCNC S-Curve Accelerations

Short segments seems to have some bug, might be next week for a fix...

The following user(s) said Thank You: endian

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endian
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09 Jan 2026 08:49 #341200 by endian

Replied by endian on topic LinuxCNC S-Curve Accelerations

Do you need to share the code or any assistance please?

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ruediger123
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09 Jan 2026 11:55 - 09 Jan 2026 11:57 #341204 by ruediger123

Replied by ruediger123 on topic LinuxCNC S-Curve Accelerations

Hello,

I've also tested several NC programs.
The jerk isn't maintained at transitions and at the end of the movement.
My configuration and the NC programs are attached.

gruß
Rüdiger

Last edit: 09 Jan 2026 11:57 by ruediger123.

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grandixximo
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10 Jan 2026 01:34 #341226 by grandixximo

Replied by grandixximo on topic LinuxCNC S-Curve Accelerations

Share the gcode please, and we will take a look next week

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tommylight
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10 Jan 2026 01:42 #341227 by tommylight

Replied by tommylight on topic LinuxCNC S-Curve Accelerations

He did but you probably did not get a notification as he edited the existing post.

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LinuxCNC S-Curve Accelerations

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