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==Hand Pump Drill (Spring-Loaded)==
Project developed by [Limitless285]
# 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.
# First Draft [[Image:HandDrill1.PNG|300px|First Draft]]
# First Draft w/ Spring [[Image:Handdrill2.PNG|300px]]
# Final Draft image coming soon!
== Bill of Materials==
# Materials Needed:
## Drill Bit(s) of varying sizes - any standard drill bits should fit this drill.
## (OPTIONAL) Spring to have spring-loaded capabilities: [https://www.mcmaster.com/#9657k439/=178iw9i Purchase here]
## [https://www.thingiverse.com/thing:2291395 STLs and Open-Source (Blender) Source Files Download]
== Tools needed for fabrication of the OSAT==
# Jellybox or similar RepRap 3-D printer
== Technical Specifications and Assembly Instructions==
* 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 [https://www.mcmaster.com/#9657k439/=178iw9i Spring sized for this print] over the drill body before securing the jaw-cover
# Attach the end handle to the spring-slide
=== Common Problems and Solutions===
* 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==
* If your solution is not a low cost one then it is not really appropriate.
# Costs for this hand-drill
* 3D printed drill = $.25
* Drill bit = $1.31 each [https://www.mcmaster.com/#2931a11/=17gho4s Source Link]
* OPTIONAL Spring = $1.40 each [https://www.mcmaster.com/#9657k439/=178iw9i Source Link]
* TOTAL: $ 2.76
# Commercial Equivalent
* $72.50 Spring Loaded Push Drill [http://www.garrettwade.com/garrett-wade-yankee-push-drill-gp.html?scid=W4011000&gclid=CjwKEAjw3KDIBRCz0KvZlJ7k4TgSJABDqOK7gYO2vcjWjWNRMwKlAOlyfDBY7yFAoVMPz4q8u9-lEhoC7_Tw_wcB Source Link]
* $15 for shipping per their calculated shipping policy
* TOTAL: $87.50
# $ savings and % savings
* A total savings of $84.74, or more than 3000% in savings.
[[category:OSAT 3D-Printable Designs]]