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  • fsabbatini
  • fsabbatini
26 Jan 2026 02:17
Replied by fsabbatini on topic scurve trajectory planner

scurve trajectory planner

Category: General LinuxCNC Questions

Good job my friend!
Can you provide any paper or info of the math background you used for it?
  • OT-CNC
  • OT-CNC
25 Jan 2026 23:31
Replied by OT-CNC on topic How do I lubricate correctly?

How do I lubricate correctly?

Category: Milling Machines

I bought a similar grease gun. You can get cheaper ones off ebay if you search for Jiabara threaded style for 70-80 gram tubes. 
The tubes are a clever accordion that screws onto the grease gun.
I did not like the nozzle/rigid stem. It locks on really tight. So maybe the real deal works better.
If you have old LM blocks with brittle plastic, you risk the chance of pulling the grease fitting out of the plastic threads. 
Be aware that some manufacturers use grease fittings with an odd pitch of M6x0.75! In case you need to modify something.

I have a machine that recommends 2 different greases. NSK Grs AS2 for the LM blocks and LR3 for the ball screws. AS2 is probably fine for both. 

I'm thinking of adding a centralized lubrication system to my current project instead of trying to access each block under the way covers. 
I have used Bijur pump and metering units adapted to ball screws and LM guides in the past using vactra no2.
I'm interested in finding out what others are doing that is more of a modern system. 
I know Haas went through a couple of redesigns with their remote lube/grease systems.
 
  • tommylight
  • tommylight's Avatar
25 Jan 2026 22:23

motor-0-position error beim Abbremsen aus 4-7,5 m/min

Category: Deutsch

Did you try lowering the acceleration?
The default of 750mm/s/s is to much for some machines.
  • grandixximo
  • grandixximo's Avatar
25 Jan 2026 21:33 - 25 Jan 2026 22:36
Replied by grandixximo on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

github.com/grandixximo/linuxcnc/tree/9d

This is phase 0 completed, according to my plan, this is extremely experimental work in progress, there are known issues at the moment, no arcs no blends, no scurve, as illustrated by the plan you can find at this post, which I got not much feedback..

forum.linuxcnc.org/38-general-linuxcnc-q...ons?start=640#341856

Next phase it is IMO too hard to be vibe coded, but I will try in my spare time.
  • rodw
  • rodw's Avatar
25 Jan 2026 19:46
Replied by rodw on topic Lichuan 4 axis stepper need help-

Lichuan 4 axis stepper need help-

Category: EtherCAT

The issue with the original code was it was developed with a machine that homes to index so it does not work cleanly with home to sensor. The real problem  is that during device homing, Linuxcnc throws following errors because it has not commanded movement. What generally needs to happen is the position feedback is synced with commanded position so Linuxcnc is happy. This is why most working solutions also provide their own cia402.comp

Yes, I think homing can be standardized for cia402 devices and the new home comp is there now to support that. So much of homing.c becomes irrelavent with device homing so the homecomp allows control of what is needed. I've had a couple of goes at it. The first was obsoleted by a rewrite of the homecomp paradigm.

The cia402 state machine is actually very simple. very linear with the exception of error and safety steps to prior states. The flowchart here is a good resource
www.kebamerica.com/blog/comprehensive-gu...a-402-drive-profile/

Anyway, back on task. It occurred to me that I had included some standard PDO's that are not reported by Ethercat pdos. I will revisit that. 

 
  • Mr1576
  • Mr1576
25 Jan 2026 19:11
Replied by Mr1576 on topic HAL Edits for RS485 / VFD Spindle Control

HAL Edits for RS485 / VFD Spindle Control

Category: HAL

Thanks for your reply @andypugh

I copied and pasted your suggestion into my HAL file, replacing the original erroneous text.

Unfortunately when launching Linuxcnc, an error is shown up as attached in the .png file.

Revised HAL file also attached.

Regards

Phil

File Attachment:

File Name: XYYZA2PPTREV1.txt
File Size:5 KB
  • grandixximo
  • grandixximo's Avatar
25 Jan 2026 18:51
Replied by grandixximo on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

I mostly run G64 P0.05 in metric, G64 P0.002 in inches, G61 is afterthought for us, but will be tested...
  • Lcvette
  • Lcvette's Avatar
25 Jan 2026 18:07
Replied by Lcvette on topic Probe Basic Stable error

Probe Basic Stable error

Category: QtPyVCP

the on screen button and physical button cannot remain synchronized as the screen cannot physically change the mushroom buttons state. so you will need to add in some hal NOT allowing the UI estop button in probe basic to be in a state different from the physical mushroom button.
  • andypugh
  • andypugh's Avatar
25 Jan 2026 17:08
  • andypugh
  • andypugh's Avatar
25 Jan 2026 17:03

XHC-WHB04B-06 rotary knob button feed rate not work

Category: Advanced Configuration

You could quickly check if those have the desired affect by opening halshow, opening the "watch" tab and picking those pins from the tree. Then you can set values directly.

If that works then link them up in HAL.
  • andypugh
  • andypugh's Avatar
25 Jan 2026 16:59
Replied by andypugh on topic The Current Bread & Butter Setup?

The Current Bread & Butter Setup?

Category: General LinuxCNC Questions

One advantage of the Pi is that it is perfectly reasonable to have an identical spare to swap in in case of trouble.
  • andypugh
  • andypugh's Avatar
25 Jan 2026 16:57
Replied by andypugh on topic How to fix "Queue is not empty after probing"

How to fix "Queue is not empty after probing"

Category: General LinuxCNC Questions

This feels like possibly a race condition, I wonder what happens if the queue-empty check is just disabled?
(ie, I wonder if it indicates a real problem?)
  • andrax
  • andrax
25 Jan 2026 16:52

XHC-WHB04B-06 rotary knob button feed rate not work

Category: Advanced Configuration

I use gmoccapy.

So far, I have found that these two signals control the feed rate:
gmocacapy.spc-feed.value
gmocacapy.spc-speed.value
  • andypugh
  • andypugh's Avatar
25 Jan 2026 16:49
  • andypugh
  • andypugh's Avatar
25 Jan 2026 16:48
Replied by andypugh on topic HAL Edits for RS485 / VFD Spindle Control

HAL Edits for RS485 / VFD Spindle Control

Category: HAL

If this is your whole HAL file then the problem is that you have connected the HAL "net" to the VFD but not to the motion contoller.
# Connect HAL pins to motion controller
net spindle-vel-cmd-rpm-abs  	hy_vfd.speed-command
net spindle-cw       			hy_vfd.spindle-forward
net spindle-enable        		hy_vfd.spindle-on
net spindle-ccw        			hy_vfd.spindle-reverse
net spindle-at-speed   			hy_vfd.spindle-at-speed

This creates "nets" with names like "spindle" enable but there is nothing at the other "end"

Try:
# Connect HAL pins to motion controller
net spindle-vel-cmd-rpm-abs  	spindle.0.speed-out => hy_vfd.speed-command
net spindle-cw       			spindle.0.forward => hy_vfd.spindle-forward
net spindle-enable        		spindle.0.on => hy_vfd.spindle-on
net spindle-ccw        			hy_vfd.spindle-reverse
net spindle-at-speed   			spindle.0.at-speed <= hy_vfd.spindle-at-speed

The => are optional and ignored by the computer.

linuxcnc.org/docs/stable/html/man/man9/m....html#SPINDLE%20PINS
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