Hypersensing with THCAD - better way to do ohmic sensing

rodw wrote:

tommylight wrote: Water is not a software issue, and there is nothing in software to fix that.

Tommy what about softwater instead of software????

None of that around here, we use plain hard water from the surrounding mountains, it has plenty of calcium and other minerals in it!
Back on subject, or subjects as this is going on on two separate threads and causing a lot of chasing around, can you do a plot of the THCAD5 raw voltage from the time a probe is issued till it finishes, please ? I would like to see the change throughout the process with a dry and a wet torch. Also a plot from the torch on signal to arcok from both THCAD's.
Both of you, please, as it looks one is having much more issues than the other, and he might be onto something regarding his wiring.

Here is something interesting about ohmic sensing and watertables

Ohmic sensing does not work on a water table with a Plasmacam despite what people say. The water continuously goes back into the nozzle and shorts it out causing a "torch hit material" error. The machine continues to blow air after it is done cutting and this causes water to spray up into the torch, shorting it out.

See: plasmaspider.com/viewtopic.php?f=3&t=30183

Well Rod, after my 2nd read through this thread I'm going to give this a whirl on my table too. Just put the order in for the THCAD-5.

It looks really promising.

Hi, I read the whole topic and I think you did very well. There is no development of the topic lately and in this regard I have a suggestion to people who cut with Hypertherm. Add post.Text ("\ n M03 \ n") and post.Text ("M05 \ n") to the Sheetcam postprocessor right at the beginning of "function OnPenDown ()".
This way with Duramax torches you will avoid the recurring error due to a drop of water inside the nozzle.

So your saying to a delay before the torch moves down to allow the water to blow out?

thefabricator03 wrote: So your saying to a delay before the torch moves down to allow the water to blow out?

I think what he's saying is to pulse the torch on and off before probing. Its not able to be done in PLasmac becasuse a M3 triggers a probe sequence. Its really only an issue on the first probe and after that it the postflow keeps the nozzle clear of water. Maybe there is a case for Plasmac to do that on the first pierce or if x seconds has elapsed from the end of the last cut.