In this video we assemble a DIY micro drill rig (tiny DC motor + drill bit + frame) and a submersible water pump, then test drilling a small “well” and pumping water through tubing. I explain the mechanism, torque limits, and 3 upgrades for better performance.
[pdf] PVC or steel casings are commonly used for sandy soil due to their strength and resistance to corrosion. Selecting the right drilling equipment is critical for success. For sandy soil, you may opt for a portable drilling rig that can efficiently penetrate the sand layer.
[pdf] Reverse circulation is achieved by blowing air down the annulus of the rod, the differential pressure creating air lift of the water and cuttings up the inner tube which is inside each rod. It reaches the deflector.
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