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![](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.homemadetools.net%2Fforum%2Fshowthread.php%3Fp%3D116894%23post116894&media=https%3A%2F%2Fs3.amazonaws.com%2Fhmt-newsletter%2Fhmt_avatar_200.jpg&description=Mystery Hole Digging Drop Tool - GIF by Elizabeth Greene - There is a related technology called "Cable Percussion Drilling=". It uses a tool dropped by gravity to cut through soft stuff and smash its way through rock. Then a winch (or people) lifts the tool and drops it again. The spoil is removed by a cable dropped cylinder with a flapper on the bottom. It's an ancient technology, going back thousands of years.
Making bits for this is a dead simple forging and welding job and a f= "Pin It")
There is a related technology called "Cable Percussion Drilling". It uses a tool dropped by gravity to cut through soft stuff and smash its way through rock. Then a winch (or people) lifts the tool and drops it again. The spoil is removed by a cable dropped cylinder with a flapper on the bottom. It's an ancient technology, going back thousands of years.
Making bits for this is a dead simple forging and welding job and a few bucks worth of scrap. The hard part is the winch mechanism or finding some people to pull the rope.
See also: Wellspring Africa's Hand Powered Percussion Drill
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