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I didn't want to pay $100 for an earth auger that could easily be made in an hour or two, so I made one from scrap. You can see the process in this video.
If you want to make a post hole digger as well, an angle grinder and a welder are required.
I couldn't get any larger sheet metal, so I welded plates from narrower steel strips. It's easier to machine afterward.
Drilling is easy as long as the ground is moist and free of larger stones.
It takes me 5 to 10 minutes to drill a 40 cm (1.3 ft) deep hole. The diameter is 16 cm (6.2").