Advanced Search

Perhaps this is the wrong place to post this but I am doing so incase someone thinks it may be within probe basic as the issue.

Problem: When I probe a corner of my 6-sided precision ground stock, and then run the tool path, the cuts are offset. At the probed Y side, the endmill is a few mm AWAY from the side not cutting and on the opposite side it is digging in a few mm causing a crash. It appears something similar is happening on the X side as well.

Machine: Taig CNC with linuxcnc 2.9.4 using probe-basic

Here is what I have done to debug:
1. Indicated my vise jaws, confirmed vise is in line with X and Y
2. Indicated my probe tip, made sure it is straight
3. redid probe basic probe tip calibration which results in a number in line with my other machines (I use the same aliexpress 3 axis probe)
4. confirmed the table is trammed, column is perpendicular to the table
5. Tested axis travel with a dial indicator mounted in-line with each axis. When I command movement of 12.7mm the indicator reads 0.5 inches so it appears the axis are travelling the correct amount (both X and Y)
6. Using fusion360, verified my endmill dimensions are correct (9.525mm), toolpath seems as usual, simulation looks correct

Additional information:
1. I added a screenshot of my 3/8 endmill on the side I probed, it is hard to tell but the endmill is about 2mm away from actually touching the side whereas it should be digging in 0.2mm into the side and cutting
2. added the start of my gcode file

Question: Do you all have any other suggestions on what I can try to do to debug the issue further? This is the only machine I have issues with. I have a linuxcnc lathe and tormach mill with pathpilot and both work correctly.

thank you. sorry don't see this thread. too difficult for me but i will try

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
 

Can you try removing the "0x" part from the pdo entries in the xml file?

For example
"<pdoEntry idx="6040" subIdx="00" bitLen="16" halPin="cia-controlword" halType="u32"/>"
is working for my A6 servo driver

I reinstalled the full Linux, because I probably already messed everything up.
Now the configuration wizard worked right away and everything works fine.
Thanks again for your help.

I agree, but pretty good, non the less.
I am adding this one from our forum by Mozmck as i looked for it several times and could not find it, i am thinking this should be in the "computers and hardware" section, not in the "general LinuxCNC questions".
forum.linuxcnc.org/38-general-linuxcnc-q...ead-and-irq-affinity

Could you post some pictures of your machine and an example completed work (just so we can see what exactly you are trying to achieve)?

Do you unclamp, flip, and then reclamp to machine on the other side?

Good to hear you've solved the issue!

Not quite as good as the first though...

Changing the PC would be my first choice as i can find used ones cheap, the "Enterprise edition" Dell or HP or Lenovo or Fujitsu have worked nicely for me, and so have some laptops like Lenovo T470, X1 yoga, Y370, but these are not guarantied to always work.
For now you can try isolating CPU's as plenty of members here had good results with it and it's easy to do
forum.linuxcnc.org/38-general-linuxcnc-q...idiot-s-guide#334498
Or if you want to dig even deeper:
forum.linuxcnc.org/18-computer/57219-lin...nel-parameter-tuning

Found another one
blog.loriowar.com/how-to-reduce-jitter-on-linuxcnc

Still, the counterweight would solve your existing issue, and not hard to implement.

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

I dont think the weight is the problem maybe more that the ball screw is fast. 20mm per turn. I got a good quality rexroth ballscrew so I used it. Because of the faster screw I used a stronger stepper motor 12Nm nema34.

MaHa;

I tried that syntax several times and every time I would load the code a validation error would be raised.

Out of frustration, I deleted all of the code and re-typed it. This time the code loaded without error and ran perfectly.

Thanks for the encouragement.

Regards,