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Zayoo wrote:

I can confirm that generic_spi communicate with board.

@MirkoCNC
And not just headers, but also SPI lines. They should be as short as possible. I tested on my bord at 4Mhz no errors at 4.5Mhz wrong data and to many errors.
 

Something must be awfully wrong somewhere if constraint to only 4meg. I can do 50Mhz no problem with a dedicated PLL clock and differential data lines (terminated at only one end). And more or less 25Mhz over cheap/inductive dupon jumper wires... 

You don't need to restart LinuxCNC before changing the stepgen scale
you just have to make sure motion.motion-enabled is false when changing it.

I would like some advice please on how to proceed with the computer I am using to run LinuxCNC.  I have just installed the latest version of LinuxCNC (2.9.3 Debian12 Bookworm Preempt -RT) and have run the Stress Test for an hour - the figures are not encouraging: 85953ns max jitter.  I know this is way too high, and if I were to use this computer I would have to make some changes, or it might be that no matter what I do it will not be suitable for software stepping.  If so I might have to save-up for a Mesa Board and do the stepping there.  The problem is that  I have no real feel for what scale of improvement various changes might have. 

The computer is a Dell Optiplex 745 with an Intel(R) core (TM)2 CPU 4300@1.8GHz.  It has 6GB of DDR2 SDRAM and is using the on-board graphics card.  I know the graphics card is the first place I should look to make an improvement, and I have the opportunity to buy an AMD Radeon 450 with 4GB GDDR5 - but it is not that cheap. I have a simple 3 axis cnc mill with just 3 Nema 23 stepper motors, but I would like to upgrade it at some future point.

My first question is: in very general figures, is it realistic to think that a new graphics card might reduce the jitter figure by, say 60000ns, or is this too optimistic - is it even worth a try?  If any new graphics card could not make this scale of improvement it might be better not to buy the Radeon and put the money towards a Mesa board.

My second question is: if I were to buy the Mesa board would I still need to upgrade the graphics card anyway, or could I stick with the on-board card?

Finally,(preparing my self for the worst !), I have been looking at the range of Mesa boards available and it is a little confusing for a novice.  The advice on this site seems to be a year or 2 old, and so I would be most grateful if you could recommend the most suitable board for me.  I cannot imagine I will ever require more than 5 axis - I probably will stick with 3, but I might double up the motors on Y.  I need the ability to control the spindle (1500Kw 24000rpm currently using a Chinese VFD), and the mist (just a compressed air feed).  
Grateful for any pointers
Mitch

Your user profile got disabled by the anti spam bot. Happens sometimes.
I apologize for any inconvenience.

My previous posts are still on the server though

There were no posts associated with the disabled user profile 'egemens'.

[edit]
Seems your IP is on several DNS blacklists. So that may have something to do with it.

today i have tried... but it dont work... Ref Z will ref my y Axis and REF B will ref my Z Axis... DRO are right but the ref buttons won´t work... when i ref all axis manual (not with ref all) i´ve become an error too when i try to move a axis... the error is joint -1 must be homed but i don´t have joint -1

Hi there,

It was a while since i haven't logged in into the forum, when i tried it was unsuccesful. I tried to register with my old username and email which succeeded. Somehow my user seems to be deleted. My previous posts are still on the server though. Anyway when i tried to log in today, i'm confronted with message login is blocked. There was no way to reach an admin or something, so i registered through another mail address with a new username to write this message.

If an admin is reading this, can you tell me what's wrong with my account?
And also i couldn't find a way to reach an admin other than creating another account and posting here. 

my previous username was "egemens"

Best,
Egemen

Good day!I have an NVEM v1 board bought back in 2017. I decided to install the Remora firmware on it. I can't connect to it with ST-Link and RS232. There are S1 contacts on the back side, I tried to jumper them, no result. Has anyone encountered this?
 

Thanks for getting back to me.

I wanted to that that I got the image to burn onto a card through random internet searches / and re-try's. I'm sure we are all familiar with middle of the night stubbornness. LOL

Once burned the image seemed quite quite good to me with the caveat that my next step will be to get my 7i95T board configured so I haven't yet tested end-to operation.

I used saved versions of all the raspberypi.org and raspbian.org config files for apt including the keyring files that are needed. So it was quick to update/upgrade/apt install a reasonable collection of Pi specific config tools.

So thanks for making that image available.

I do have a few questions/hopes about embedding some of those tweaks into the Pi 4/5 specific IMG's.

1) Include the Pi specific APT/PGP files on the conditional build you are using for the Pi.

2) Include the core Pi executables as well with serious bonus points for adding those to the default app-lauch UI like is being done for LinuxCNC.

Those two things would substantially reduce the newbie headwinds for those that are either new or rusty on Linux.

Thanks so much for all your work!

Richard

tommylight wrote:

Yeah i thought that was not the best answer as i understand why you are asking, but with Mesa there is no need to update firmware ever, changing firmware can be done based on your needs easily, i have a 7i92 and a 6i25 that i have flashed over 50 times doing all kinds of testing.
Also Mesa downloads will contain whatever firmware is available for that card, for some over 20 versions with different combos of stepgen/PWM/encoders/IO etc to choose from.
-
Just to be clear, i have no affiliation with Mesa, i used them once on a retrofit and got even specialised firmware from them in a day for exactly what i needed, from then on i exclusively use Mesa as they are extremely reliable, support is absolutely perfect as you can see above (PCW is the owner of Mesa), and by now i have over 80 Mesa boards on industrial machines in use daily, never had a single failure.

Hi @tommylight,

but with Mesa there is no need to update firmware ever

I am correct in understanding that when I get a new Mesa 7i96S card, I don't have to flash any firmware to it, please?

-- That is, it is ready to be used as it comes.

(
I have already paid for one, via Mr. Andrew Beck from New Zealand, I have not received it yet. He did not have one in stock, he has done an order from the U.S.A.
)

Thank out and best regards,

...behai.

JT shared some gcode for sheet alignment.
gnipsel.com/linuxcnc-old/index.html
At one stage, I modified this to run on Gmocappy macro buttons.
Maths in gcode really sucks but the way this is done is to probe the material in two places and save the two sets of X,Y coordinates
you end up with a right angled triangle between these points. Then you can use pythagoras theorem to calculate the hypotenuse of the triangle which is the distance along the material edge between these points
With some simple trig, you can calculate the angle the sheet is aligned on.
Finally, given this angle, you can rotate the X,Y plane around the  Z axis by this amount

fully_defined wrote:

I found your page earlier, but your photos aren't very clear and the thread is 76 pages long. Is there a page there that is especially relevant to my goal?
 

I linked you to the exact post on about page 3 ot 4

csurimilan wrote:

only in my comuter they are "jumping" to another position (my motors are not moving) and its a larg number like almost 300mm in x and y axis

it does not matter. if you home your machine,  it still has to move to the home switch and homing will zero the DRO

You can use the tool to export the drive sii file, then modify it to disable eoe and then flash it back

You can add me as a friend on Discord or WeChat and I can help you configure remotely
Discord: onceloved.cn WeChat: 304394405

im using the EC500 motion controller with remora firmware.

im using normal stepper motors nema23 1.8deg with DM556 driver. (without encoder)
my maschine has dual y motors: XYYZ (gantry is woking good)