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Originally Posted by Big-Un
I would not use argon in any closed shop, too dangerous. Instead, the nitrogen bottles are relatively cheap and are dry.
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Bigun, I don't disagree that Nitrogen would work, but there is nothing dangerous with Argon in a chemical sense. It is an inert gas. Like Nitrogen, it can displace oxygen and cause asphyxiation, but the quantities must be huge, and the ventilation non-existant, for there to be any danger. Guys are using CO2 for engraving; same deal. The airgravers simply don't process enough gas for this to be an issue, IMO.
I tossed out the Argon as an option for shops where a lot of welding takes place. In many shops like this, there are 1 or dozens of huge 3,000 PSI bottles, and overhead manifolds, to support welding ops. It'd be easy to tap an Argon regulator to run an airgraver, or rotary tool.