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  • tommylight
15 Dec 2025 21:52
Replied by tommylight on topic Advantech PCM 9362 freze when opening latency-test
Use this ISO
www.linuxcnc.org/iso/linuxcnc-2.7.14-wheezy.iso
Boot the PC from it and run the tests in Live mode, meaning do not install, see if it hangs.
  • tommylight
15 Dec 2025 21:49
Replied by tommylight on topic VOLATILE_HOME not unhoming on fault
LinuxCNC has not lost any ability to shut off anything, there is no need to shut the power down for stepper and brushless servo drives on normal faults, that was for DC brushed servo systems and even for those normal enable/disable drive was and is used, leme give it a try:
-stepper motors and brushless servo motors do not go into runaway if an output mosfet shorts, they just lock in one place and burn slowly if the drive fails to blow a fuse or trigger a full shutdown
-brushed motors do run at full speed in one direction in such an event, hence the necessity to have another set of "extreme" limit switches on both side of any axis that cut all power to drives
-older brushless servo drives had two separate power inputs, one for the drive stage and one for logic, most new ones only have a single power input
In general, drive power should be cut only on e-stop event, in normal operation drive enable/disable should be used.
-
If you are OK with using e-stop, wire (in hal) the drive enable signal to e-stop out, that should do what you want, but i have no clue if your machine agrees with that.
  • NWE
15 Dec 2025 21:44
Replied by NWE on topic Avon 3000 Mill retrofit
Can you find any specs on the motor that drives the CVT adjuster? Maybe even a pic. of its nameplate. I suspect something should be available for it. Using a VFD for speed control a person can gain some low end torque using closed loop speed feedback and PID, but the CVT on my Wilton mill certainly has a lot more low speed torque than I was able get with just a vfd on another project.
  • alangibson
15 Dec 2025 20:24
MetalHeadCAM 0.3.0 released was created by alangibson
Hi all,

I've just pushed MetalHeadCAM v0.3.0 to  cam.metalheadcnc.com . I'd love to hear any and all feedback you have.

Just import a DXF file, then click the Add button in the operations panel. After that you should be able to simulate and export Gcode.

Since the last release:
- Much improved performance
- Added spot operations

I'm still not maintaining backwards compatibility, so if you've tried it before be sure to go to the hamburger menu in the top left corner > Settings > click Reset Application before use.

 
  • djdelorie
15 Dec 2025 20:15
Replied by djdelorie on topic VOLATILE_HOME not unhoming on fault
I will add that, with the invention of "servos with a step/dir interface", linuxcnc has lost the ability to shut off the servo power yet still keep track of where the machine *is* for when power is restored :-(
  • djdelorie
15 Dec 2025 20:12
Replied by djdelorie on topic VOLATILE_HOME not unhoming on fault

My thinking is that once you have the machine dialed in you will never get this error.

Agreed; I wired my servos this way for when I get a hard crash.  the "fault" includes following errors in the clearpaths, and I really want the machine to stop and release the servos and spin down the spindle.  The hard crash might be a fleshy crash.  I realized the servos were going to lose position, added the VOLATILE_HOME, and discovered this bug...
  • Sekai
15 Dec 2025 20:07
Advantech PCM 9362 freze when opening latency-test was created by Sekai
Hi.
I have mini pc that i tried to install linuxcnc ( latest version) but horrible latency above 100000.
So i put Debian 12 and install kernal RTai 5.4.258 and linux cnc 2.9.3.
All is good, latency test is like max 24000 with default settings in the bios ( remove everything from the bios i got about 16000 after 2 hours).
The problem sometime the mini pc freeze when running tests (latency-test) so i have to restart.
I thought the bios settings was the culprit so i restore bios to default but the same.
Should i use i different distro or kernel?
 
  • jaro_p
15 Dec 2025 19:53 - 15 Dec 2025 19:59
Replied by jaro_p on topic Changes in configuration files generated in pncconfig for 7i76 to 7i78
[/attachment]  I know that there is a configuration 7c81_7i78x2d.bit, but there is the same on P2 as on P1 - 7i78. Another 4 axes. And I don't need that for the lathe. But I would like one MPG encoder for each axis - basically to be able to control the lathe "almost" manually. The rest of P2 controls the tool turret and on P7 there are limit switches and buttons.
So that's the goal.
  • tommylight
15 Dec 2025 17:38
Replied by tommylight on topic 7i96s + 7i78

You need a parallel port(female) to flat connector (think IDE PATA connector).
Dude, really ????
IDEA PATA is a 40 pin connector, and just to make you wonder, comes with a 40 wire and 80 wire flat cable.
Find out why.
And as a precaution, it is not a floppy drive connector either, that has ?? pins ! :)
  • tommylight
15 Dec 2025 17:35
Replied by tommylight on topic 7i96s + 7i78
You would need this and maybe another DB25 to DB25 cable, also know as parallel port cable
eusurplus.com/index.php?route=product/pr...59_63&product_id=130
And might need a firmware flash, but do check what is already installed on the card using mesaflash
  • sin-do-re
15 Dec 2025 17:09
7i96s + 7i78 was created by sin-do-re
How can i use a 7i96s together with a 7i78 to get 2 more STEPGENs?

My main board 7i96s was being used to control 5 axis Stepgens, but one has fried completely, and i was hoping i could expand the board with a 7i78 i have laying around, to control a total of 6 (4+2) stepgens. is this possible? What bit file should I use? Is there one available for it ?


Best regards
 
  • PCW
15 Dec 2025 16:54
Replied by PCW on topic Changes in configuration files generated in pncconfig for 7i76 to 7i78
There is a 7I78X2 configuration: 7c81_7i78x2d.bit 

Do you need MPG encoders or high speed encoders+index?
  • Aciera
15 Dec 2025 15:50
Replied by Aciera on topic VOLATILE_HOME not unhoming on fault
I have opened an issue:
github.com/LinuxCNC/linuxcnc/issues/3668
  • jaro_p
15 Dec 2025 14:44
Replied by jaro_p on topic Changes in configuration files generated in pncconfig for 7i76 to 7i78
Alternatively, could someone please create a bitfile for me for 7c81 with one 7i78 and port P2 entirely for encoders (i.e. at least 3)?
  • tommylight
15 Dec 2025 14:22
Replied by tommylight on topic LatheEasyStep – experimental QtVCP macro for step-by-step lathe programming

This should be moved to the Qtvcp section..
Done.
Thank you.
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