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.

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  First Draft

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  First Draft w/ Spring

• Final Draft image coming soon!

Bill of Materials[edit | edit source]

1. Materials Needed:
   1. Drill Bit(s) of varying sizes - any standard drill bits should fit this drill.
   2. (OPTIONAL) Spring to have spring-loaded capabilities: Purchase here
   3. STLs and Open-Source (Blender) Source Files Download

Tools needed[edit | edit source]

1. Jellybox or similar RepRap 3-D printer

Technical Specifications and Assembly Instructions[edit | edit source]

• 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.

1. Print all part at .1 mm resolution (lower resolution may still work, but have not been tested)
2. All parts should be printed vertically. The end-handle should be printed with the hole on the narrow end facing up.
3. Insert spring-slide over the drill body. After a few rotations, it should revolve smoothly.
4. Place the chuck-jaws into the drill body with the jaw-cover screwing into the body over the chuck-jaws
   1. If a spring is being used, place the spring Spring sized for this print over the drill body before securing the jaw-cover
5. Attach the end handle to the spring-slide

Common Problems and Solutions[edit | edit source]

• Apply lubricant to the drill body (should not be necessary)
• Ensuring the end-handle is printed with the hole facing up ensures accurate sizing and print quality for a snap-fit.

Cost savings[edit | edit source]

• If your solution is not a low cost one then it is not really appropriate.

1. Costs for this hand-drill

• 3D printed drill = $.25
• Drill bit = $1.31 each Source Link
• OPTIONAL Spring = $1.40 each Source Link
• TOTAL: $ 2.76

1. Commercial Equivalent

• $72.50 Spring Loaded Push Drill Source Link
• $15 for shipping per their calculated shipping policy
• TOTAL: $87.50

1. $ savings and % savings

• A total savings of $84.74, or more than 3000% in savings.

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