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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?
 

[/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.

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 !

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

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
 

There is a 7I78X2 configuration: 7c81_7i78x2d.bit 

Do you need MPG encoders or high speed encoders+index?

I have opened an issue:
github.com/LinuxCNC/linuxcnc/issues/3668

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)?

cmorley wrote:

This should be moved to the Qtvcp section..

Done.
Thank you.

I've never moved anything in a forum before, how do I do that?

This should be moved to the Qtvcp section.
Looks promising! Keep is updated! If you get stumped with the programming i can try to help.

Does joint.N.amp-fault-in actually turn the machine off?

Yes, it does.

Not near a machine so i can not confirm this, but IIRC:
Yes it does Disable the machine.
No, it does not trigger e-stop.

Does joint.N.amp-fault-in actually turn the machine off?

Yes, it does.

I don't know about the file size @scotta ?
But scotta made the beta to try and solve my CSS problem. I still have no solution. If you have the RT1052 controller. Let me know if you can get the CSS working on your build.

Repository:
github.com/peter-pan08/LatheEasyStep LatheEasyStep is an experimental QtVCP panel for LinuxCNC that enables step-by-step conversational lathe programming directly at the machine — without external CAM software.The goal is fast, safe, and practical programming for typical workshop jobs.PurposeLatheEasyStep is designed for:

• Programming simple to medium turning operations directly at the machine
• Repetitive standard jobs (facing, contouring, grooving, drilling, threading, roughing)
• A workflow-focused approach:
  Enter parameters → Verify preview → Generate G-code

It aims to bring an industrial-style conversational workflow to LinuxCNC.Current Feature SetProgram Structure

• Program header with stock/workpiece parameters
  (diameters, lengths, units, safety values)
• Step-based program building with sortable operation list
• Save/load for single steps and full programs
• Bilingual UI (DE/EN)

Supported Operations

• Facing
• Contour
• Groove / parting-style operations
• Drilling
• Threading
• Roughing (material removal)
• Keyway (macro-based)

Preview & Visualization

• Live X/Z preview including reference geometry
• Dedicated chuck safety zone visualization (color-coded with legend)

Safety & Motion Logic (Core Focus)

• Context-aware retract/free-travel behavior per operation
• Material-aware retract decisions
• Extended chuck / no-go safety parameters:
  • Chuck size
  • Workpiece type
  • Clamping mode
  • Chuck profile
• Machine/workshop profile presets for faster setup

Project Status

• Experimental
• Actively developed
• Designed for real machine workflows
• Iterative improvements based on practical use

Known Limitations

• Not a full CAM replacement
• Complex freeform geometry is intentionally limited
• Machine-specific adaptation may be required

Target Direction

• Fast conversational programming at the machine
• Clear and understandable geometry visualization
• Safer default behavior for common turning tasks
• Continuous refinement driven by community feedback

Feedback WelcomeIf you test it, helpful reports include:

• Brief machine/configuration info
• Reproducible steps
• Expected vs. actual behavior
• Optional screenshots, preview images, or G-code snippets