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Luckly I installed a disk brake on my lathe's spindle during the retrofit (brake is operated with pressurized air). This works pretty well for holding the spindle during cutting in a specific angle.

Make sure the drive enables work so a runaway is stopped
before damage occurs. Alternatively, decouple the linear axis
from the motors.

A blind setup has about a 50% chance of a runaway because
either the encoder direction or analog output polarity are reversed
resulting in positive feedback = runaway.

I have gotten the spindle to react in CSS it's doing the opposite getting slower as x moves in. But I'm more concerned about the spindle speed changing is not smooth. Everytime it's adjusting the speed it jerks and it's not smooth. Video clip below.

youtube.com/shorts/1r4Jos8_Y1k?si=ZHSdJYkjGlDulI3B

As far as I understand, this v5 supports imput 220vac 4 kW 4.5 kW motors,

What makes you say that?

It is long ago but as i remember there are accelation ramps for your handwheel that i programmed..

As far as I understand, this v5 supports imput 220vac 4 kW 4.5 kW motors, but is it not suitable for mach3? Doesn't it provide 5v pulse/dir?

As far as I'm aware V4 used an obsolete power semiconductor this (v5) is a forked project with a new design.

The origingal project is here but has not seen updates in a few years:
github.com/rene-dev/stmbl

Note that v4 does not support motors above 2kW either.
You might want to ask for updates over on this site as there does still seem to be some activity there:
app.gitter.im/#/room/#rene-dev_stmbl:gitter.im

Still no luck with that. I also get the feeling that testing under load might not be the best test.

My machine originally had a 18 speed gearbox. I reduced it down to 5 and did all the rpms inbetween using the vfd. Just switched that back to the original config and run the vfd/motor at its normal speed (2750 rpm). The extra torque from the gearbox keeps the rpm stable enough, so far I can live with that speed.

But still thank you for the answers!

Beautiful! Nowhere as near exciting here. But I have reworked my ethercat lab and have some beckhoff slaves installed for the first time (after I found an ethernet cable was faulty!)

 

I still have to get the homing switch working. The 8mm sensor does not see the aluminium so it needs a strip of steel fitted

i managed to make it work, but having a weird issue, 1000 speed command is almost giving me a 10krpm, 
what could be the issue here ? i am manually testing it with hall show, 

i have attached my vfd hal and ini files, for testing with hall show i # all nets

 

but how is that possible there are a lot of sample videos with mach3 stmbl v4

Old versions still work.

Don't change stuff unless you really need to.

If it works, don't mess with it.

(With software at least)

Why not just continue using 2.8.4?

www.linuxcnc.org/iso/linuxcnc-2.8.4-buster.iso

Perhaps a dedicated GPU will solve the issue?
(A cheapo one will be fine)

Does it work right now?

If it ain't broke, don't fix it.

What does lspci say?

Perhaps try a different number.

There is often like 3 hexadecimal codes for one card.

Try all three, maybe one will work.