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A quick way to verify that you have fixed the divide by 0 issue
is to set the update rate to 0 in say halshow, and the set it back to say 1
If communication continues at 1 Hz, then the issue has been fixed.

(I say this because at least in a RIP installation the
mesa_modbus.c.tmpl file used is not the one in the
LinuxCNC sources)

Delving into this in more detail, the AtoD conversion doesn't look very stable.
My digital voltmeter reads on a nominal mid position of XY feed pot a steady, non varying 1.666v
the 7i73 analog0 numbers flicker, not regularly, like on a timer, but with a fast random up and down.. With a slow-mo video
I actually get readings 1.565882,1.578824, 1.591756 the differences are exactly one bit. (3.3volts, 255 bits, ie 0.012941 volts per bit)
When the servos are on, then this flicker is actually audible.
Can you suggest anything that I can do to improve this please?
Thanks

i make another test this time with raspberry pi4 (4gb)
 

I have some Sunix PCI-E cards that work properly.
forum.linuxcnc.org/18-computer/54368-pci...ut-of-the-box#313942

To normal people, those numbers seem very far fetched as there is no pricing info for anything like that.
As Americans say: if you have to ask for the price, you can not afford it.
And when you do ask, be sitting with a glass of cold water in hand and 911 on speed dial.
Only when you have invoices in hand for such stuff, you start believing (coupled with the headache it induces)
See if you can find pricing for commercial license 5 axis CAM and report back here, if you can!

We (mods and admins) get e-mail notifications for every post, always, so from 50 to over 100 daily.

I think that you should enable HPC (High Performance Computing) to prevent it from lowering the cpu frequency. Possibly also core performance boost. And to see if the kernel parameter works: cat /sys/devices/system/cpu/smt/active

my only contact is the sales lady

Sure, but can you please expain what you would like to do?

I've sent an email. We'll see. If anyone has a contact, please let me know.

Yes. What's holding me up is having blown up my parallel port :<
So I'm getting lost in details while waiting for the card (well, I bought two of them) to show up.
For other people's reference, the Dell Sunix 0GP385 cards work fine with LinuxCNC and are readily available on ebay.

About 8-10 years ago we looked at an entry level hi definition plasma table and it was AUD $130k direct from the manufacturer.

Success! Known files run as anticipated.  Did require tweaking several INI parameters and I am sure more refinements will happen as I develop experience with this version. 

I am using to drive a rose engine lathe and thus the reason for the XZC coordinate system.

Thanks again for your patience and assistance.

Nice

The old tp (old old) used to hit the centre of each segment, which is what caused it to become excruciatingly slow and sorta useless for high speed contouring. So we don't want to do that.

With short segments the key is is deviation. if you set a deviation of 10 microns, then the motion simply has to slow down in certain sections to ensure its never more than 10 microns away, and yes you might blend over 20 segments to do this. The current planner is reasonably good at this in terms of keeping speed as high as possible but never deviating too far. It does create a few instances of improper deviation though that it looks like yours would fix. For example a lead into a a facing cut would blend across the long face segment causing it to not cut flat.

Since I can only look at pictures and go "oooh, ahhh", my quesiton is: how does it deal with tangential motion that exceeds acceleration abilities? You only show the helixes perpendicular to the G1 motions. So for example a rounded corner that's a G3 move, but is only 0.5mm radius. You need to basically "blend out" that G3 while adhering to the P value.

I think it was transient and due to  the forum sending too many emails for the quota on whatever email platform is used by the forum.
I did recognise Tommy and Snowgoer from the screen dump you sent me, Both are pretty prolific posters.
I rarely subscribe to threads.