The Hilsch vortex tube

Step 8 Dremel!

Pull out the Dremel* and a flat headed grinding bit* and get to work. Too hard? nope, just be careful, wear eyeglasses* and go at it. use that groove you made with the spade bit as a depth guideline.

With a steady hand, this won't take long at all!

*available at amazon.com!

Comments

[ScienceWiz]

I am really determined to build one of these (I've wanted one since I saw it in a McMaster and Carr mag. but didn't feel like forking over 200 bucks for one) but I have a question about this step.

What exactly am I supposed to be dremeling? After I drill the holes and use the paddle-bit, what piece am I supposed to dremel and what am I trying to remove/smooth/etc.

Please reply if you get a chance, I would be very thankful!

And Great instructable btw, so far this is the only informational tutorial I've seen for making a vortex tube!

[apchar]

I think what he means is that you don't use the paddle bit to dig down and make the indentation for the washer. You use the dremel for that. Most paddle bits have 3 points, one at the center and two on each end.
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Normally, when you drill into wood with them, the center point digs in first, then the two outer points dig in (and the circle appears), then the flat part digs in & starts tearing out wood. Here, the purpose of the paddle bit is just to dig the perimeter of the circle. You're only using those two outer points of the bit. At least I hope that's what he means, since I'm starting the project tonight.

[Morganbarker]

That's the way I understand it as well. Although I do have a cheap and cheezy backup index of spade bits that don't have the scribe edges. They're not good for much though.