Haha was on the fence of buying one just because of the hype. I then went with a "cheap" Voron 0.1 kit instead. It was a pain to get it "sort of" running .
I am not willing to tune it to the end. (too lazy) I ended up changing the extruder, because the gears from the kit where not really good.
Now the Voron gathers dust instead of a youknowwhat. ....
Question remains: is the youknowwhat really the solution to all the 3d printing let downs?

Do you use a USB to RS232 adapter cable? Not all of them work properly. This one does

www.amazon.de/dp/B08B6C1XQN?th=1

Thanks for the ideas. I will try running the spindle in open loop and see what that does. I noticed the spindle variations in the video as well, while using the machine, I did not even notice them. More spindle tuning is needed, it seems.

The filter is set to “True” right now. I will try turning it off to make sure that does not change anything.

Regarding the collet closer, I thought about cutting grooves, but as the part is hardened, I don’t like my chances of getting that right. Moglice seems like the best way. I remember Robin Renzetti using it on his D-bit grinder.

The only issue there is that the shaft has holes to port the air to the cylinder. I would have to close these in some reversible way and then machine them back down to the shaft diameter to be able to remove the collar after injecting the goo. Epoxy putty, maybe?

Next thought about the collet closer...

I'd measure the spindle shaft and see if it's still round.  If it is, and you can get the bearing rings out, it could be possible to use the air fitting threaded holes to inject Moglice in to the annulus between the rotary union bore and the part it rides on. 

Once its cured and you've removed it - not a trivial task to be sure - you could use a grooving tool to clear out the existing air grooves.  Maybe even hone the cured Moglice to provide a much smaller gap - less air leakage, but still some to counter dust ingress and provide a little cooling.

If you're not keen on Moglice, maybe shrink-fit or glue a couple pieces of thin-wall brass or bronze tube inside the union - leave a gap between them for the air grooves - and bore it out to a closer fit.

Last option would be to groove the union ID to fit a couple of teflon seals.  Shouldn't be too hard to find some low-tension rings that just fit around the rotating part and don't drag too much.

Shot in the dark here...

When I switched my spindle encoder to a fairly high resolution version I ran in to intermittent problems with the signal.  Turns out Mesa cards have a filter on the dedicated encoder inputs that can be adjusted:

Setting it to False sorted things out in my case.

I've no idea if this is causing you a problem, but it's a easy & free thing to test.

After that, next suggestion would be to remove all the PID loops and other stuff from the spindle motor control loop.  Run the VFD open loop, variator set to one position.  Take everything that changes spindle speed out of the equation and do another series of G33 tests.

I don't know that the spindle speed variations are affecting the threading, but it cant be helping things.  Listening to that WAAAHH-uuhhhh-WAAAHH-uuhhhh in the video was driving me nutsimage missing /media/kunena/emoticons/wink.png

Thank you for your support. One more silly question: how do I get updates? By updating to the latest version 2.10 of LNC?

It appears I'm on my own... again. So far nothing worked to get a repository to update LinuxCNC. So I said f-it and completely deleted the partition and reinstalled linuxcnc completely from scratch. I am gad I did.  The new installation resolved several issues. Most importantly, the editor in Linuxcnc that nothing I tried worked to get it resolved, is now resolved.
 
 

Sorry I meant to say Freecad version 1.1.1 and the CAM workbench, into Linuxcnc.

Hi All 

Thank you to everyone who commented.

Much appreciated indeed  

I re-wired some of it , that didnt help, but at least it confirmed that what I had seemed reasonable, which was good to know.

The scale with a minus sign did provide another option, which I used , the comments also provided a better understanding that I might have been changing the same thing over and over just in different ways and complicating matters.

In the end I iterated through as many possibilities as possible, and eventually it both homed, and it jogged in the correct direction.

I milled a square out of a piece of plywood (using Linuxcnc v1.1.1 and the CAM workbench),  and the machine seems to work fine. 

I am very greatful to everyone who contributed through this forum in order to get this machine going, and to keep me going too
 

Hello, good afternoon. Could someone help me load the .bin firmware onto the EC500 RT1052? I've tried several programs and commands, but without success. I have the Chinese Stlink V2 and a Raspberry Pi Pico.

I got one of these at Xmas and it's been excellent. It's often described as a Bambu clone. Currently £239 in the UK, arrived in 2 days and works locally without the need for internet or their Elegoo cloud. 320C, heated bed, wifi, webcam, PLA/PETG/ABS/ASA/TPU/PET/PC/PA etc. They do a multi colour version for £398 but I'm not a tart. I model stuff up in Fusion, export as STL and use the Orca slicer that supports it out of the box, controls it over wifi and doesn't seem to need any fiddling about.
Elegoo Centauri Carbon

That type of instruction executes correctly; the problem only occurs when executing one of type o<XXXX>. I tried executing it from the MDI in the form o<xxxxx> call and it also gives me an error.