Next, stack your crates on top of each other. I had some clamps handy so I clamped my crates together to hold them in place while I did the next step. If you don’t have clamps, you might want to connect one crate at a time.
STEP 3: Screw Your Crates Together While your crates are stacked, drill screws on the bottom of each crate (except the very bottom one, of course). *Note: when you see the crates stacked, you’ll want to drill the screws on the bottom (underneath) side so you can’t see the screws.
*FAIL ALERT! You don’t want to have your screw go completely in until the drill stops, because you’ll experience cracking like this! You need only to drill the screw until it is flush with the crate, and no more.
Here is how the bottoms of your crates should look from underneath. Check out those perfectly flush screws!
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source: hometalk.com