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epineh
epineh

17 May 2025 13:05

Replied by epineh on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Category: Computers and Hardware

Hmm so I had checked the datasheet earlier, never actually looked at price and availability, I see what you mean.

The main idea was to save pins, they run out quickly on the tang nano. I guess the simplest solution is to step up to the spartan 6.
There is OctoQuad by DigitalChickenLabs for the pi pico that will do a similar thing for 8 encoders via I2C but as you say it would also require a new plugin.

Cheers.
Russell.

meister
meister

17 May 2025 12:47

Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Category: Computers and Hardware

Hi Russell,
the LS7366 are no longer manufactured and you would have to write a new plugin. The ones you can still get are also quite expensive.

can't you just make a plug-in board (on the top) and route all the encoder pins to the top via pin headers?

Cheers, Olli

DonatasO
DonatasO

17 May 2025 12:21 - 17 May 2025 12:33

G53 not ignoring tool length offset after a Python M6 remap was created by DonatasO

G53 not ignoring tool length offset after a Python M6 remap

Category: Advanced Configuration

Hi,

I'm writing an M6 remap in Python and encountered strange and dangerous behavior. After the first M6 call, G53 G0 takes into account the tool length offset, which should not be happening.
I'm unsure if I'm doing something wrong or if this is a bug in LinuxCNC. I hope you can help me clarify and resolve it.

LinuxCNC version: 2.9.4
UI (probably irrelevant): qtdragon_hd

This is a minimal working code to reproduce the issue:

# REMAP=M6 modalgroup=6 prolog=change_prolog python=is_this_a_bug epilog=change_epilog
def is_this_a_bug(self):
    if self.task == 0:  # ignore the preview interpreter
        return INTERP_OK

    emccanon.CHANGE_TOOL_NUMBER(self.selected_pocket)
    yield INTERP_EXECUTE_FINISH
    pose = EmcPose()
    pose.z = -50
    emccanon.USE_TOOL_LENGTH_OFFSET(pose)
    yield INTERP_OK

Steps to reproduce the issue:

Turn on and home the machine
T6 M6: the tool is loaded and offsets are set correctly.
G53 G0 Z0: the spindle rapids down to -50mm. This is not expected.
G49: cancel tool length compensation.
G43: enable tool length compensation
G53 G0 Z: the spindle rapids back up to zero. This is expected.

The issue can no longer be reproduced by issuing T6 M6, everything works correctly.

Attaching debug logs for each command:

T6 M6

Warning: Spoiler!

Issuing EMC_TASK_SET_MODE --      ( +504,+24,    +6,    +3,)
NML_INTERP_LIST(0x55561aff7b10)::clear(): discarding 0 items
NML_INTERP_LIST(0x55561aff7b10)::append(nml_msg_ptr{size=24,type=EMC_TASK_PLAN_SYNCH}) : list_size=1, line_number=0
emcTaskPlanSynch() returned 0
NML_INTERP_LIST(0x55561aff7b10)::get(): {size=24, type=EMC_TASK_PLAN_SYNCH}, list_size=0
emcTaskPlanLevel() returned 0
Issuing EMC_TASK_PLAN_SYNCH --      ( +516,+24,    +0,)
emcTaskPlanSynch() returned 0
Issuing EMC_TASK_PLAN_EXECUTE --      ( +509,+280,    +7,t6\032m6\n,)
emcTaskPlanLevel() returned 0
NML_INTERP_LIST(0x55561aff7b10)::append(nml_msg_ptr{size=280,type=EMC_OPERATOR_DISPLAY}) : list_size=1, line_number=0
NML_INTERP_LIST(0x55561aff7b10)::append(nml_msg_ptr{size=24,type=EMC_TOOL_PREPARE}) : list_size=2, line_number=0
NML_INTERP_LIST(0x55561aff7b10)::append(nml_msg_ptr{size=24,type=EMC_TOOL_SET_NUMBER}) : list_size=3, line_number=0
emcTaskPlanExecute(t6 m6
) returned 2
emcTaskPlanLevel() returned 1
emcTaskPlanSetWait() called
NML_INTERP_LIST(0x55561aff7b10)::append(nml_msg_ptr{size=24,type=EMC_TASK_PLAN_SYNCH}) : list_size=4, line_number=0
NML_INTERP_LIST(0x55561aff7b10)::get(): {size=280, type=EMC_OPERATOR_DISPLAY}, list_size=3
emcTaskPlanLevel() returned 1
Issuing EMC_OPERATOR_DISPLAY --      (   +13,+280,    +0,    +0,\032in\032prepare\032tool=6.000000\032pocket=6.000000,)
NML_INTERP_LIST(0x55561aff7b10)::get(): {size=24, type=EMC_TOOL_PREPARE}, list_size=2
emcTaskPlanLevel() returned 1
Issuing EMC_TOOL_PREPARE --      ( +1104,+24,    +0,    +6,)
NML_INTERP_LIST(0x55561aff7b10)::get(): {size=24, type=EMC_TOOL_SET_NUMBER}, list_size=1
emcTaskPlanLevel() returned 1
Issuing EMC_TOOL_SET_NUMBER --      ( +1109,+24,    +0,    +6,)
NML_INTERP_LIST(0x55561aff7b10)::get(): {size=24, type=EMC_TASK_PLAN_SYNCH}, list_size=0
emcTaskPlanLevel() returned 1
Issuing EMC_TASK_PLAN_SYNCH --      ( +516,+24,    +0,)
emcTaskPlanSynch() returned 0
emcTaskPlanClearWait() called
NML_INTERP_LIST(0x55561aff7b10)::append(nml_msg_ptr{size=280,type=EMC_TASK_PLAN_EXECUTE}) : list_size=1, line_number=0
NML_INTERP_LIST(0x55561aff7b10)::get(): {size=280, type=EMC_TASK_PLAN_EXECUTE}, list_size=0
emcTaskPlanLevel() returned 1
Issuing EMC_TASK_PLAN_EXECUTE --      ( +509,+280,    +0,\255,)
emcTaskPlanLevel() returned 1
NML_INTERP_LIST(0x55561aff7b10)::append(nml_msg_ptr{size=168,type=EMC_TRAJ_SET_OFFSET}) : list_size=1, line_number=0
emcTaskPlanExecute((null)) returned 0
emcTaskPlanLevel() returned 0
NML_INTERP_LIST(0x55561aff7b10)::get(): {size=168, type=EMC_TRAJ_SET_OFFSET}, list_size=0
emcTaskPlanLevel() returned 0
Issuing EMC_TRAJ_SET_OFFSET --      ( +223,+168,    +0,0.000000,0.000000,-50.000000,0.000000,0.000000,0.000000,0.000000,0.000000,0.000000,)
mdi_execute_hook: MDI command 't6 m6
' done (remaining: 0)
tool_result(id=6, xoffset=0.0, yoffset=0.0, zoffset=-50.0, aoffset=0.0, boffset=0.0, coffset=0.0, uoffset=0.0, voffset=0.0, woffset=0.0, diameter=6.0, frontangle=0.0, backangle=0.0, orientation=0)

G53 G0 Z0

Warning: Spoiler!

G49

Warning: Spoiler!

G43

Warning: Spoiler!

G53 G0 Z0

Warning: Spoiler!

17 May 2025 11:54

Replied by JT on topic linux cnc keeps bending shortcutting to the next line.

linux cnc keeps bending shortcutting to the next line.

Category: General LinuxCNC Questions

It's important to understand how Linuxcnc follows the programmed path.
linuxcnc.org/docs/stable/html/user/user-concepts.html

Note that G64 Blend Without Tolerance Mode is the default

A good preamble should always be the first line of any nc code program.
gnipsel.com/linuxcnc-old/g-code/gen01.html

JT

Sternfox
Sternfox

17 May 2025 11:38 - 17 May 2025 11:49

Mill as lathe with probebasic was created by Sternfox

Mill as lathe with probebasic

Category: QtPyVCP

Hey peeps.

I have A couple of questions. I want to use my mill as a cnc lathe.

Can I have pb turn and mill on seperate profiles?
And can pb turn utilise 3 axis? I need the third to line up the work and to change tools which I will have in the vice.

The other option is using a custom post in fusion but im guessing thats way more complicated.

Thoughts?

Much appreciated

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