Inputs & outputs & relays ohmic

I really think you should forget ohmic sensing and just make hunting knives so you can get away with a float switch on thick material. I got as far as drilling and tapping a threaded hole into the end cap of my last plasma torch so I cold attach a wire. But I got cold feet before I wired it in once I considered the circuit required and it scared me!

The other alternative which would be much safer would be to use a pneumatic cylinder to lower a probe and ohmic sense off it. Just use one of Tommy's drawer slides! You should be able to trigger it off the ohmic enable signal. If you can sell that idea to Phill, I'm sure that any required modifications will find their way into plasmac!

Well, the probe would stick lower than the torch I think all you would need is an ohmic offset like you have for the float switch and trigger it off the Ohmic enable relay as the air ram extension would be pretty instant.

Something like this is as cheap as chips

The issue with the 30XP is you only have 2 types of shields. The drag shield which has the .060 built into it and the fine cut which alows the nozzle to be drug right on the steel. So I have been modding the drag shields on the lathe and taking off the extra nibs on the end so I can have a gap. I have a set of machine shields for the 45xp being delivered today and I’m hoping I can get them to work on the 30XP.