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The Hilsch vortex tube

Step 6Drill! (part II)

Drill! (part II)
This part's a wee bit tricky... those lines you drew, well, using those as a guideline, we need to drill about 3/4ths the way down the line, but not ALL the way. So, pick the drill bit that allows whatever type of air line you're using to fit snugly (test on a spare piece of MDF... er... acrylic) and get to it.

You need to be very careful how you drill this one... if you do it just right, the right side of the drill bit will just scrape the inside of the circle you cut if you drilled all the way down. So just drill both sides.
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