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Seems to load and run here (master branch):
 

Okay, now I am getting inconsistent behavior. Yesterday, I switched on the machine, the PC booted, and I was able to check the 7i84 connected with it's 7i77, and also check the voltage of the 24V rail (204).

Today, I wanted to repeat that, but the PC gets no power. I receives 110VAC via pins 150 /151 from the same 3Ph  transformer (6T1) which also powers the 24V DC rails. The 110VAC secondary is protected by fuse 6F6 , which has not tripped.

 

The primary of the that transformer is only protected by that main fuse/breaker Q2. I measured the output of Q2. Between L1/L2--> 400V , L1/L3 -->240V,  L2/L3 --> 200V. WTF?

Shut down again, tripped the switch on Q2 to remove all loads, and measured on the input side of it. Same result... Between L1/L2--> 400V , L1/L3 -->240V,  L2/L3 --> 200V.

Shut down again, pulled the socket from the wall and measured. The supply is normal. 400V phase to phase between all three. There is no isolation transformer. None of the fuses or breakers has tripped.

 

I am kind of confused what could be pulling down the voltage on those lines, unless I have an open circuit on one and the multimeter is just picking up tiny current induced into the lines like an antenna?

The complete dmesg is more interresting as there a mention about qtvcp

Hello everyone,

Yesterday, I managed to blow up two Mesa boards within just a few minutes, and I’m still not sure why it happened or how to avoid this in the future.

The machine is a retrofitted Schaublin 125CNC lathe, which had been running flawlessly—until last Friday’s coffee break. When I came back, I found the central lubrication pump had burned out, apparently because it had been running continuously.

I discovered that output 6 and output 7 were permanently high as soon as the card was powered up. These outputs are connected to 400V 3-phase contactors (for the lubrication and coolant pumps), each with a 24V coil and a flyback diode directly across the coil. Each contactor draws about 275 mA.

I’m not sure which output failed first—or whether both failed at the same time. The coolant pump is already configured in HAL but hasn’t yet been wired to its contactor, so I can only confirm that the lubrication pump was not being controlled by LinuxCNC at all—it isn’t connected in HAL.

After powering down the machine and disconnecting the wire between the lubrication pump’s contactor and output 6, I turned the power back on. While sitting in front of the control cabinet and moving some wires around, I saw smoke coming from the 7i85S board next to the 7i76E. It appears that capacitors C22 and C24 have blown, and one IC also looks suspicious.

I’m only using the encoder inputs of the 7i85S, and those still seem to be functional. I suspect that one of the unconnected step/dir outputs may have been damaged.

While I can accept that switching contactors directly might not have been ideal (even if within spec), I don’t understand what could have caused the damage on the 7i85S—especially since nothing was connected to any of its outputs.

During my investigation, I also realized that I had used the VIN pin on the field power connector instead of pins 1, 2, 3, or 4—so field power was supplied through the internal jumper. Could that have caused issues?

By the way, this part of Norbert’s connection sheet (page 2) may be a bit misleading or unclear in that regard.

Both boards are still working, aside from the two damaged outputs and possibly one or more differential outputs on the 7i85S. Also worth noting: the 24V supply to the cards is not switched on the DC side; the PSU is switched on the AC side.

Should I replace the boards anyway, or are they still safe to use going forward?

Thanks in advance for any help or insights!

— Max
 
         

I have something similar but my file is not even big : 80k. (attached)
The bottom indicator says "LOADING 100%"

My display freeze, but the mouse cursor still move. VerNum on my keyboard is unresponsive. But I can connect with ssh.
dmesg is full of:

The second-hand section has no machine of the needed size and I remember that I once called them about those and the answer was some "oh those are outdated and the information unmaintained".
And I'm pretty sure too, that they had kits before.
But I just noticed there is a supplier who has basic kits and accessories:
www.sorotec.de/shop/CNC-Mills/Alu-Line-Mills/
(the gantry variant seems to be a solid starting point as it is meant to be driven by 2 steppers for the x-axis).
(Maybe I should start an extra thread for finding the right machine/parts set for me..)

Will be quite some work for me to get the BOM complete, though.

You have a steep learning curve ahead.

Do you have the robot arm to test with?

If not, you should start with a 3 axis pen ploter to get things going. Then you move to genserkins kinematics.

linuxcnc.org/docs/html/man/man9/kins.9.h...trivial%20kinematics

Linux CNC has excellent documentation. I suggest you to get things started and comeback with a more specific problem.

Try a tutorial like this one: 

After learning about stepconf wizard, it will come handy to learn how to use hal, if you need to customize something down the road.

linuxcnc.org/docs/html/hal/basic-hal.html

same values or i am wrong??


 


thanks

I forget 1 thing.. i use a 64gb micro sd card from the brand kexin from amazon.

amzn.eu/d/hXGglyV

try this

OK, in that case have a look on the used machines section, if they are significantly cheaper it will be easier for you to yank stuff out and you might find one that uses parallel port so makes it even cheaper, as mechanically they should be OK.
www.cnc-step.com/second-hand-cnc-router-used-milling-machines/
I am pretty sure they had kits before, but there is no such thing there now.
Asa general rule for the old one, if the price is not 40-50% lower than new, do not bother with it. If it ends up 20% cheaper, not worth the risk and the lack of warranty/support.

No worries, thanks for the confirmation!

forum.linuxcnc.org/38-general-linuxcnc-q...e-trajectory-planner
What are you ready to pay them and what exactly do you need?

Hi guys!I am on a new Project and found a mesa 7c81 an 7i92 on the flewmarket... dont know why someone sell it on a flewmarket...i start reading about the 7c81 and look to my boxes and found a raspberry pi 4 b version with 8gb ram.. oki load the image for the sd card from the linuxcnc website and bring it up.i isolate cpu 1 2 3 but latency doesnt go down.

Any tips?
in the config i disable audio blueetooth and overclock to 6v and 2000mhz..

which information i can share to get the cow frome the ice?

thanks all


 

 

 

ok great, will have a look. need to see if there is a way to have that set from system preferences maybe. hmmm