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  • PCW
  • PCW's Avatar
01 Nov 2025 03:41
Replied by PCW on topic optimising the computer for linuxCNC

optimising the computer for linuxCNC

Category: General LinuxCNC Questions

What are the following error limits set for?

Do you lose packets?

That is, what is hm2_7i76e.0.packet-error-total?

Can you post your hal / ini files?

Do you have the usual optimizations:

isolcpus = last cpu in grub (isocpus=3 for a 4 core CPU for example)

IRQ coalescing off with Intel MACS

DKMS driver installed with RealTek MACs

Ethernet IRQ pinned to last processor
 
  • LeonDolnicar
  • LeonDolnicar
31 Oct 2025 20:36
optimising the computer for linuxCNC was created by LeonDolnicar

optimising the computer for linuxCNC

Category: General LinuxCNC Questions

Hello from Slovenia

I built a 3 axis CNC milling machine. To run it I use a PC and mesa 7i76eu. They work well but every now and then I get an following error. To minimize this I increased latency from 1000000 to 1500000. Following errors are now less common (sey aonce per two hours of running). It is not critical but still it is anoying to rehome the machine. Is there anything I can do to optimize the computer and mesa comunication so there will not be any following errors.

thank you,
Leon Dolničar
  • DerKlotz
  • DerKlotz
31 Oct 2025 12:10
Joint 2 on limit switch error -> Z Axis was created by DerKlotz

Joint 2 on limit switch error -> Z Axis

Category: Basic Configuration

Hi,
i get the "Joint 2 on limit switch error". I have a Mesa 7i76e and you can find my configuration for Joint 2 attached. 
I tried several things but still with no success.
Please help
  • Hakan
  • Hakan
30 Oct 2025 08:29
Replied by Hakan on topic New ethercat / probe basic control for minimonster

New ethercat / probe basic control for minimonster

Category: CNC Machines

Here are the general signals that was generated for me by pncconf some years ago.
net spindle-vel-cmd-rps        <=  spindle.0.speed-out-rps
net spindle-vel-cmd-rps-abs    <=  spindle.0.speed-out-rps-abs
net spindle-vel-cmd-rpm        <=  spindle.0.speed-out
net spindle-vel-cmd-rpm-abs    <=  spindle.0.speed-out-abs
net spindle-enable             <=  spindle.0.on
net spindle-cw                 <=  spindle.0.forward
net spindle-ccw                <=  spindle.0.reverse
net spindle-brake              <=  spindle.0.brake
net spindle-revs               =>  spindle.0.revs
 net spindle-at-speed           =>  spindle.0.at-speed
setp spindle.0.at-speed 1
net spindle-vel-fb-rps         =>  spindle.0.speed-in
net spindle-index-enable      <=>  spindle.0.index-enable
net spindle-revs              <=   hm2_7i76e.0.encoder.04.position
net spindle-vel-fb-rps        <=   hm2_7i76e.0.encoder.04.velocity
net spindle-index-enable      <=>  hm2_7i76e.0.encoder.04.index-enable
net spindle-manual-cw     halui.spindle.0.forward
net spindle-manual-ccw    halui.spindle.0.reverse
net spindle-manual-stop   halui.spindle.0.stop
You would need at least the enable and one of the vel-cmds.
Maybe forward/reverse and so on.
They all connect to the spindle pins (created by the motmod component).
Speed feedback is optional but nice to have, at-speed if your spindle can do that.
 
  • bnet
  • bnet's Avatar
24 Oct 2025 19:48
Replied by bnet on topic Fanuc Serial Pulse Coders - Red cap servos, mesa 7i76e, how to?

Fanuc Serial Pulse Coders - Red cap servos, mesa 7i76e, how to?

Category: Driver Boards

I think you are suggesting that you could supply "fake" commutation signals from LinuxCNC to the drive, and that might be enough to persuade the drive to start working?

This is what I'm thinking. I will try it as soon as I have time and report back.
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