The Kola Borehole drilled in Russia to a depth of 40,230ft.
It's an easy way to limit the depth of your holes.
Usually you use a core drill and remove a sample to whatever depth you require.r
drill, depth guage, tap, screw
It all depends on the type of borehole you require, the depth you need to get to and the surrounding geology. Not really the sort of job to be undertaken by an individual as it requires specialist equipment and knowledge of the area.
If there is blood under the nail and throbbing pain, drill a small hole through the nail to let the blood out. I have used a drill press (really) for easy control of the depth as you only want to drill through the nail and not into the skin underneath.
It delivers the correct number of seeds to the correct depth and with the correct spacing for an optimal crop.
For a water well, until you reach the water table. The depth will vary.
Depth of the sea floor. For example at 30,000+ feet of depth, it becomes increasingly difficult to drill for oil on the open sea.
The seed drill allowed more seeds to be utilized. Traditional methods (broadcasting) was extremely wasteful because most of the seeds would be eaten by animals. The seed drill allows seeds to be planted at a specific depth and rate.
Quite simply because you have to drill deep enough to get to the substance you require be it water, oil or gas.
Sets the corn seed in the ground during planting. The drill can maintain a preset depth and drop the seed at the correct spacing and distance needed by the farmer. The seeds are poured into the hopper and feed down into each tube as the tractor pulls the drill through the field.