Question about THC parameters

There is a difference between the edges/sides, I can see it with bare eyes but it's still in the tolerance. I even changed the threshold to 0.5v to see if there is any difference but not really. I guess I have to live with this until I figure out something. Btw, how do you get the result 0.52s for the cut speed to get from 80% to 100%?

I dunno either now...
3900 mm/min = 3900/60 mm/sec = 65 mm/sec
65 * 20% = 13mm/sec
to accelerate from 52mm/sec to 65mm/sec @1500 mm/sec/sec
= 8.6 ms

Is that right?

My table at 5000 mm/sec/sec acceleration does it in 2.6 ms. I have noticed an improvement with corners since I upgraded it.

Yes, 8.66667ms and my table is the same, at my current 1500mm/s/s acceleration, there is less dross and less metal burnt around the corners and I am quite happy with it.

Hi all,

I got the latest version of QtPlasmaC, all running bar the Powermax communications issue which I haven't figured out yet. We were hoping that the issue of the torch lifting away from the material and throw a "valid arc lost" would go away, but it has reared its ugly head again.

I am cutting 12mm steel (problem occurs with every thickness, from 2 to 25mm). I have tried different settings in the THC parameters, tried mode 0 and mode 1, tried disabling void anti dive and velocity anti dive, but it doesn't make a difference. The only thing that works is disabling ARC OK, but then the THC is locked which is problematic on longer cuts when material is a bit buckled. And the thing is, sometimes it runs like a dream, and then all of sudden this issue emerges and we have no idea what causes it. And when it starts behaving like this it seems to get worse,  and the next morning the problem disappears image missing /media/kunena/emoticons/shocked.png

We are at a loss, now idea what to do. We got several blokes using this machine and they are not as well acquainted with the plasma, but they should be able to load a program, find the origin and cut whatever they need. Not puling their hair out when the torch all of a sudden lifts away for no apparent reason. Anyone got ideas ?

Cheers, Peter

While this lifting is occurring:
Are there any errors in the Machine Log apart from the lost arc?
Does the lost arc error appear before or after the lifting?
Is the Z axis lifting rapidly or slowly?
Does the Z axis DRO show the height as increasing during lifting?
Is the UP LED on while lifting?
Does the Arc Voltage reading change while lifting?
 

Hi all,

The thing happens so quickly it is difficult to work out what is actually happening first. But I have changed the ARC Lost delay in the custom hal file to :
Cheers, Peter