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  • akg1904
  • akg1904
08 Jan 2026 10:30
Replied by akg1904 on topic Clarifying the Rot-point values

Clarifying the Rot-point values

Category: Advanced Configuration

Hi Aciera,

Thanks for the reply.

So if the intersection of the A and C axes for Dx=0 is below the bed (as in my case which I have shown in above screenshots.) the the rot-point is also at that point as denoted in screenshot with point A.

Is my procedure correct or is it point B from where we should take rot-point?


Regards
Abhishek
  • SOLD
  • SOLD
08 Jan 2026 10:24
Replied by SOLD on topic 7i92M + 7i76 add PWM+PktUART

7i92M + 7i76 add PWM+PktUART

Category: Driver Boards

Thank you for your previous reply and guidance regarding the RS-422 interface
on the 7i76 and the suggestion to use an external RS-485 transceiver.
That explanation was very helpful.

I am currently using the 7i92_7i76x2d_2pwm bitfile, and I have reviewed the
IDROM configuration using mesaflash.

From the IDROM, StepGen 5, 6, and 7 are mapped to P1 DB25 pins
1/14, 2/15, and 3/16. These step generators are unused in my system.

I would like to ask whether it would be possible to replace StepGen 5–7
with two additional QCount modules (Quad-A, Quad-B, and Quad-IDX),
using those same I/O pins.

If this is feasible and acceptable from a resource standpoint,
would you be willing to provide a custom bitfile with this change?

Thank you again for your time and for your continued support.
  • Stvn
  • Stvn
08 Jan 2026 09:59
7i92tm_7i76u was created by Stvn

7i92tm_7i76u

Category: PnCConf Wizard

So I find out 3 different Linuxcnc o.s later that I should just settle with 2.9.4 because the cards were new versions “2025” mesa boards…. 2weeks of wrestling with a combination of ip address, firmware,software, etc I’m at a complete stalemate. Really wish I would have just went the g540 route, I was able to flash the firmware. Same firmware I downloaded off of mesas site 7i92tm software. Onto a usb drive loaded onto desktop move the file over to desktop it’s already unzipped so I go in and tell the terminal which combo I have “ 7i92tm_7i76u. I believe the file ends with x1pd.bin? If I’m not mistaken. Anyways, Wrestled with the flash “spelling “ supposedly for about 3 days. Finally got it flashed. Now when I go in pncconf in the pin config setup/card discovery picks up a combo of “7i92 internal data”no tm” next box down shows the combo 7i92 with 7i76. Kool! But in the pinout only the tb4 tb5 tb6 terminals show. 7i76u “2025” step dir goes on tb2 and tb3, only it’s like they don’t exist and now im thinking about just being a chef 
  • Aciera
  • Aciera's Avatar
08 Jan 2026 09:40
Replied by Aciera on topic Clarifying the Rot-point values

Clarifying the Rot-point values

Category: Advanced Configuration

I assume you are talking about the 5axis trt kinematics. If so see section 5.2 for a description of offsets Dx and Dz:
linuxcnc.org/docs/master/html/motion/5-axis-kinematics.html
Rot-point is the intersection of the A and C axes for Dx=0.
  • akg1904
  • akg1904
08 Jan 2026 08:22
Clarifying the Rot-point values was created by akg1904

Clarifying the Rot-point values

Category: Advanced Configuration

Hi everybody,

I have a small doubt which I hope you all can clarify.

For my z-rot-point calibration,
In my case I think the z-rot point is the distance between z-machine-zero position to the primary rotary axis pivot point (in my case A-axis pivot point) is the z-rot-point value i.e.as shown in screenshot 1: The vector from the origin of the machine coordinate system to point A on the first rotation axis of the table is set as the rotary table position in the machine coordinate system.

Similarly for z-offset in screenshot 2: When the rotation axes for controlling the table are all at 0 degrees, the vector from point A to point B on the second rotation axis of the table is set as the intersection offset vector in the machine coordinate system.

if tell me whether what I have done is correct or not.
Because I went through many threads in the forum but in most cases the rotary point of A-axis is at higher level(in Z-axis term) then the bed(C-axis rotary point) and in my case it is opposite.



 
  • soehlrich
  • soehlrich
08 Jan 2026 08:10
Replied by soehlrich on topic Qtdragon_hd Zero button not zeroing

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

Yes it does, if I jog the axis it will change. It doesnt seem to be realted as to how far I jog, the axis just has to move, even 0.1mm
  • grandixximo
  • grandixximo's Avatar
08 Jan 2026 06:30 - 08 Jan 2026 06:48
Replied by grandixximo on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

The scurve is present now in linuxcnc master, download from GitHub and build, or use the latest .deb files

With many thanks to Grandixximo and 杨阳 we now have an experimental
S-curve / finite-jerk trajectory planner for testing.

For those that build from source just look for the new v2.10.0-pre1 tag.

Others can download debs from github for the next 90 days:
x86 / bookworm  github.com/LinuxCNC/linuxcnc/actions/run...artifacts/5056097663
x86 / trixie github.com/LinuxCNC/linuxcnc/actions/run...artifacts/5056161668
ARM64 / bookworm github.com/LinuxCNC/linuxcnc/actions/run...artifacts/5056139840
ARM64 / trixie github.com/LinuxCNC/linuxcnc/actions/run...artifacts/5056124080

Make no mistake, this is experimental, there are no guarantees that
these won't break your machines. The first user already hit the hard
stops when homing (too-low max jerk setting)
With the jerk setting it is probably best to start high and reduce, as
infinite jerk is closer to current behavior.

If you run these you are volunteering to be a guinea-pig.
magazine.punch.co.uk/image/I0000NOWOOdkXT_k
  • rodw
  • rodw's Avatar
08 Jan 2026 05:57
Replied by rodw on topic New and Working RTAI debs for 2.9

New and Working RTAI debs for 2.9

Category: Installing LinuxCNC

Life has got more complicated. With proper kernel tuning, latency can be better with Debian 13. I am in the process of publishing a second video about this on YouTube. Please refer to my channel. www.youtube.com/@MrRodW
The yet to be published video should be watched before the current one.
  • cmorley
  • cmorley
08 Jan 2026 05:50
Replied by cmorley on topic Qtdragon_hd Zero button not zeroing

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

If you zero again, does the small values stay the same?
  • soehlrich
  • soehlrich
08 Jan 2026 05:32
Replied by soehlrich on topic Qtdragon_hd Zero button not zeroing

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

  • cmorley
  • cmorley
08 Jan 2026 05:16
Replied by cmorley on topic Qtdragon_hd Zero button not zeroing

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

Rhe formatting of the message is screwing it up.
Just make a short new message with the images
  • soehlrich
  • soehlrich
08 Jan 2026 05:16
Replied by soehlrich on topic Qtdragon_hd Zero button not zeroing

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

 
  • soehlrich
  • soehlrich
08 Jan 2026 05:13
Replied by soehlrich on topic Qtdragon_hd Zero button not zeroing

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

Hi,

I can seem to add the attachments, both less than 1M. Click add image, I can then see it, and press insert.
  • cmorley
  • cmorley
08 Jan 2026 05:08
Replied by cmorley on topic Qtdragon_hd Zero button not zeroing

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

attachments didn't come though.
  • soehlrich
  • soehlrich
08 Jan 2026 04:20 - 08 Jan 2026 05:12
Qtdragon_hd Zero button not zeroing was created by soehlrich

Qtdragon_hd Zero button not zeroing

Category: General LinuxCNC Questions

 Hi,I have been using linxcnc 2.4 for quite some time and though it would be a good idea to upgrade to the latest qtdragon_hd version. I did a completely fresh install using LinuxCNC 2.9.8
Debian 13 Trixie PREEMPT-RT ISO

I am running a MESA 7176E board for the interface with step and direction ( using Teknic SDSK servos) so effectively open loop. The hal file is copied from my old configuration, so I know it worked. I have added any new items that were needed

I have managed to get everything working pretty much as before and axis all home correclty and the home co-ordinates are all set to 0. If I then jog the table to a position and press Zero on any of the Axis the G54 Cordinates are not zeroed. See attached pictures.

If I set a jog interval like 0.1mm then every jog increments the DRO by the correct amount and the DTI indicates the table move correct.Using the Offsets screen, if I set the G54 offset to the X axis position at shown for the G53 X axis then the G54 will indicate 0. If i then press Zero it goes to some small number.

Does anyone have any ideas ?

I have disabled all EOffsets.Any help great appreciated.

Thanks
  [attachment=73775]20260108_160616.jpg[/attachment]
 [attachment=73774]20260108_160046_2026-01-07.jpg[/attachment]
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