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  • Aciera
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10 Mar 2025 16:55
Replied by Aciera on topic good day to all (in some gtp languages)

good day to all (in some gtp languages)

Category: Off Topic and Test Posts

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  • Aciera
  • Aciera's Avatar
10 Mar 2025 16:54
Replied by Aciera on topic Delta VFD-B Modbus with QtDragon_hd

Delta VFD-B Modbus with QtDragon_hd

Category: General LinuxCNC Questions

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  • Todd Zuercher
  • Todd Zuercher's Avatar
10 Mar 2025 16:35
Replied by Todd Zuercher on topic QTplasmaC upgrade now huge latency

QTplasmaC upgrade now huge latency

Category: Computers and Hardware

The old Linuxcnc version would have been based on running a 32-bit version of Debian 7 (Wheezy) and depending on your hardware likely running the RTAI real time patched kernel. This worked well with many slower CPUs.

The latest versions of Linuxcnc's ISOs are based on 64-bit Debian 12 (Bookworm) and comes with a Preempt RT patched real time kernel. This system generally does not give good latency with slower CPUs. You may need to try to install an RTAI version. (I have not tried to get a current release of Linuxcnc running with RTAI so I can't be of much help there other than to point you to the documentation.)
linuxcnc.org/docs/stable/html/getting-st...#cha:Installing-RTAI
  • Todd Zuercher
  • Todd Zuercher's Avatar
10 Mar 2025 16:22 - 10 Mar 2025 16:24
Replied by Todd Zuercher on topic Error when starting LinuxCNC: “undefined symbol: kinematicsSwitch”

Error when starting LinuxCNC: “undefined symbol: kinematicsSwitch”

Category: General LinuxCNC Questions

I think you might be missing some essential entries in the [TRAJ] section of your ini file and one that's there may be named wrong.

You have:
[TRAJ]

COORDINATES = X Y Z
NO_FORCE_HOMING = 1
MAX_LINEAR_VELOCITY = 100.0
DEFAULT_VELOCITY = 50.0


Try changing it to:
[TRAJ]

COORDINATES =  X Y Z
NO_FORCE_HOMING = 1
LINEAR_UNITS = inch
ANGULAR_UNITS = degree
DEFAULT_LINEAR_VELOCITY = 50.0
MAX_LINEAR_VELOCITY = 100.0
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