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  • langdons
  • langdons
13 May 2025 20:48
Replied by langdons on topic Bridgeport VMC760 retrofit

Bridgeport VMC760 retrofit

Category: Milling Machines

Do you need all new drives?

I thought only one broke.
  • Murphy
  • Murphy
13 May 2025 20:32
Replied by Murphy on topic Remora - ethernet NVEM / EC300 / EC500 cnc board

Remora - ethernet NVEM / EC300 / EC500 cnc board

Category: Computers and Hardware

That's interesting Cakeslob, this makes sense if it's to slow to react it would be like cutting the signal which it seems to be doing. There's something about changing it to PWM in Mach3 software and it uses a different pin.

If I can get the PWM signal direct and use an external PWM to Analog converter might work.
  • langdons
  • langdons
13 May 2025 20:14
Replied by langdons on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

Run chmod -R 500 <important-dir> on everything you don't want to be erased.

That should fix the issue.
  • langdons
  • langdons
13 May 2025 20:11
Replied by langdons on topic LinuxCNC compatible industrial PC

LinuxCNC compatible industrial PC

Category: Computers and Hardware

Yeah, buy Mean well or delta from Aliexpress.

Are you making fun of my name?

Delta are probably worse because the 12v delta power supply has only 16V caps!

Plus the volage can be adjusted as high as like 14V; that's only 2V of headroom!

And my name is Langdon.
My last name is Staab.
Langdon S.
langdons
  • langdons
  • langdons
13 May 2025 20:07
Replied by langdons on topic Which kernel version is best for real time?

Which kernel version is best for real time?

Category: General LinuxCNC Questions

I you want to play a video sans internet, play this .mp4 on the default video player (If debian even has one) or VLC (or some other file, VLC can literally play any and every video format):

www2.langdonstaab.ca/files/hai-yorokonde.mp4
  • SteepLearningCurve
  • SteepLearningCurve
13 May 2025 20:02
Replied by SteepLearningCurve on topic None of the axis are moving - using mesa 7i92t with 7i76u

None of the axis are moving - using mesa 7i92t with 7i76u

Category: Basic Configuration

Hi All
Just to recap, as its been a week or two, I have one 7i92t and one 7i76u, and need currently need 4 axis XYYZ,  and 4 limit/home switch inputs.

Thank you , I did not know that P2 was the first connector by convention.  I have since connected the 7i76u straight to the P2 connector of the 7i92t (the genders do work fine). The config from before could not find the inputs (that it previously found) and it wouldn't run.  I figured the names are probably different, I fiddled about but didn't get it to work.
I tried again using pncconf this time.
The firmware I am using is called 7i92t_7i76x2d.bin,  and I am only entering info into the P2 tab.
I see in the manual of 7i76u (page5) that its P1 has the following
db25pin to gpio to direction
10  IO13  IN
11  IO14  IN
12  IO15 IN
13 IO16  IN
This maps to the manual of 7i92t connectors (page5) for P2 as
10  IO13
11 IO14
12 IO15
13 IO16
So seems like both go together fine in both db25 pins, and in IO names.
In the HAL file these pins are  ([HMOT] CARD0=hm2_7i92.0)
# external input signals

# --- MIN-HOME-X ---
net min-home-x     <=  [HMOT](CARD0).gpio.013.in

# --- MIN-HOME-Y ---
net min-home-y     <=  [HMOT](CARD0).gpio.014.in

# --- MIN-HOME-Y2 ---
net min-home-y2     <=  [HMOT](CARD0).gpio.015.in

# --- MAX-HOME-Z ---
net max-home-z     <=  [HMOT](CARD0).gpio.016.in
On the 7i76u the field inputs (0 through 15) are on TB6 
(I previously had input4, input5, input6, and input7 working, when using the incorrect P connector)
I changed the inputs this time.
Eventually,  my question ...
Where does gpio 13,14,15 and 16 pop out on TB6? (on the field io inputs)
is input13, on TB6 , is that IO13 ? therefore I wire my x home input into pin TB6 pin 14?
Apologies for the highlighting and scribble on the manual images (these are well read, just not well understood ... yet)



 
  • Hakan
  • Hakan
13 May 2025 20:01
Replied by Hakan on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

Did that too hehe. All files gone. Luckily it was a new PC so I can redo it.
I mean do it one more time and delete all files again :)
It's the ./build_cmake_rm that is a bit aggressive.

This is the log of that command, it goes a bit further bit I only include up to the point where things go wrong.
Warning: Spoiler!
  • DarkPhoinix
  • DarkPhoinix
13 May 2025 19:26
Replied by DarkPhoinix on topic Which kernel version is best for real time?

Which kernel version is best for real time?

Category: General LinuxCNC Questions

forum.linuxcnc.org/38-general-linuxcnc-q...ults?start=40#327937
100 glxgears windows +  
stress --cpu 4 --io 4 --vm 4 --vm-bytes 1500M --timeout 200s
= no junction error
4k youtube video (1 or 2 or 3 or 4 windows) with or not remote connection = junction error

in need put like this in hal file:
 #load the Remora real-time component

loadrt remora-eth-3.0 PRU_base_freq=500000

loadrt base_period_nsec=100000

i think the problem is not video but the network load.... i can't try a youtube video offline...  i do not why people tell to use this test for combo network + vga load?? 
I am newbee i read and make ... i try the way of new version kernel fot test but  the new kernel give me more latency.
I ma near to finish the CNC, next try real work for test ...
Sorry all for my bad bad english.
  • tommylight
  • tommylight's Avatar
13 May 2025 19:21 - 13 May 2025 21:26
Replied by tommylight on topic LinuxCNC compatible industrial PC

LinuxCNC compatible industrial PC

Category: Computers and Hardware

Yeah, sorry LangdonS, but do not use inexpensive power supplies, not worth the headache they cause, the time wasted finding they are the problem, nor the damage they might cause, and some are danger to life by not being isolated from the mains.
At a minimum use MeanWell or even better Delta, the price difference is not big.
Also, using old laptop power supplies is a very good idea, they are very high quality and do not fail.
For 5V supplies, there are very cheap and good quality ones form Anker, Baseus, Satechi, Gembird, just look for 5V only, so no QC or PD, always under 10$, isolated, protected, low ripple, etc.
-
Another good idea is those same companies but the 65W PD adapters, use a trigger board set to 20V, they can be found on sale for 15-20$. I have plenty of these, like everywhere.
Waiting for 140W/28V ones to drop in price, one of these can easily handle 4 of so called TB6600 drives at full load with low inductance motors.
Although from experience, they really do not like back EMF. I killed one testing drones, as soon as you pull back the throttle fast = they die! :) Anker 65W, only the output in use died, the second output still works fine.
  • jimboh2
  • jimboh2
13 May 2025 19:06
Replied by jimboh2 on topic Linuxcnc wood lathe insufficient torque

Linuxcnc wood lathe insufficient torque

Category: General LinuxCNC Questions

The threads are inches. I have tried lots of values. Currently slow enough that you can hear it winding up. Gets it moving but it will stutter to a halt after a couple turns.
  • tommylight
  • tommylight's Avatar
13 May 2025 19:03
Replied by tommylight on topic Which kernel version is best for real time?

Which kernel version is best for real time?

Category: General LinuxCNC Questions

So why do they do these tests with 4 YouTube videos in 4k in the forum? in direct connection with stress test 100 GLXgears I can work safely even with NVIDIA! I got this AMD VGA and now I also bought a motherboard with HDMI output to pass the YouTube 4K video test!

Youtube is used to stress the video subsystem as video uses interrupts that require the PC to halt until whatever is requested by that interrupt is finished, then go on to do other stuff, and so on. I am not aware of anywhere being stated you must use 4 youtube videos, if you are, please let us know so we can fix that. A single window maximizing and minimizing is enough to trigger latency excursions, so 4 are overkill and prove nothing.
Same thing with GlxGears, video, but easier to run, but this also uses OpenGL that is used by LinuxCNC, namely Gremlin uses it to display the stuff being cut. We use 10 as it is very lite on resources, but 100?
You keep mentioning that under stress it works fine (even unresponsive, and this is something Linux does magnificently), so you can try adding a base period and test some values till you get something that gets rid of errors/issues.
Probably something like this should do, add to hal file:
loadrt base_period_nsec=100000
You can safely try from 10000 to 500000 (10K to 500K), above would probably not help at all and below might cause the PC to slow down.
  • cakeslob
  • cakeslob
13 May 2025 18:55
Replied by cakeslob on topic Remora - ethernet NVEM / EC300 / EC500 cnc board

Remora - ethernet NVEM / EC300 / EC500 cnc board

Category: Computers and Hardware

It says theres a way to set it from analog to PWM in the manual, but the manual shows that its a software option, so Im not sure how thats supposed to even work...

Maybe it is an actual issue with the analog converter, I found a post from a few years ago about the older hardware

forum.linuxcnc.org/18-computer/44828-rem...ard?start=680#264265

Maybe @rbobey1989 has some insight, hes doing something with firmware and pwm nat the moment
  • langdons
  • langdons
13 May 2025 18:32
Replied by langdons on topic LinuxCNC compatible industrial PC

LinuxCNC compatible industrial PC

Category: Computers and Hardware

What about some souped-up Raspberry Pi?

(Max CPU, RAM, etc.)

What voltage does it run on?

You can get very inexpensive DC power supplies from Aliexpress or Digi-Key.
  • langdons
  • langdons
13 May 2025 18:02
Replied by langdons on topic Which kernel version is best for real time?

Which kernel version is best for real time?

Category: General LinuxCNC Questions

Don't use remote desktop while running the latency test.

And why use rustdesk?

VNC or RDP are preinstalled and good.

Don't install stuff unless you really need it.
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