Push Drill with Adjustable Chuck

thingiverse

Inspired by Speedy777's Pump Drill (http://www.thingiverse.com/thing:731086), this beefier version of the tool builds on its design. The chuck in this upgraded version is adjustable and can handle bits from 5mm to 1.5mm with ease. The bit fits snugly into the conical chuck cavity at one end, while the flexible fingers at the other end grasp firmly onto the shank. Two full rotations occur for every stroke, ensuring fast drilling performance. When used as a pin vise, it holds needle files securely. Instructions Update: I've uploaded a new version of end_nub.STL that fits better now. All parts were printed using PLA with three perimeter layers and 30% infill. The drill body was printed on end with 0.2mm layer thickness - you may need to add a brim for stability. The slider, chuck, and end nub were printed at 0.16mm layers for smoother operation. Note that the chuck threads might require cleaning up using a triangular file. To assemble this tool, start by pushing the slider onto the drill body. Next, apply a small amount of grease to the end nub pin and attach it to the end of the drill body; it should spin freely. Then, add some grease to the chuck threads and the tips of the flexible fingers, and screw on the chuck securely. When using this tool, insert your bit into the chuck until it hits the bottom of the conical cavity, then tighten just enough so that you can't rotate the bit by hand without straining; avoid over-tightening or you risk breaking the flexible fingers! This drill works best under very light downward pressure with patience and gentle touch - for drilling larger holes, start by creating a pilot hole first.