Thanks for the ideas Christ. I did think about the steam being more dense. I wish the sound worked on my video. If it did you could tell I really need a fair amount more power unfortunately. I'm pretty sure the tank/lines are up to the task of powering the grinder. I'll just have to try a different tool. I had considered a drill, but apparently they don't really spin too fast. I just checked a few on ebay and they were all less than 1k rpm. The random orbit sounds like it might be more promising. I'll take a look at the CFM rating of some tools and see what kind of tools generally take more CFM. I'm guessing those tools will have more power behind them.
Of course I could always go back to the hand made turbine if none of this works too. That would be very easy to tweak as I could just use a pipe plug and drill it out for a jet. We'll just have to see.
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