This Hand Pump Drill is a mechanical drill that utilizes human effort to perform the functions of a drill. In locations where power tools are too expensive or there is little access to electricity, a hand drill is an effective solution. 3D printing these means they can be very cost efficient - less than $0.25 in filament, a spring, and drill bits.
This print should take about 4 hours (I printed three different prints - one with 3 pieces, one with 2, and one with 1). These could all be printed in one go, reducing print time drastically.
Assembly should take no more than 5 to 10 minutes.
Print all part at .1 mm resolution (lower resolution may still work, but have not been tested)
All parts should be printed vertically. The end-handle should be printed with the hole on the narrow end facing up.
Insert spring-slide over the drill body. After a few rotations, it should revolve smoothly.
Place the chuck-jaws into the drill body with the jaw-cover screwing into the body over the chuck-jaws
If a spring is being used, place the spring Spring sized for this print over the drill body before securing the jaw-cover
First Draft
First Draft w/ Spring