Drilling Machines

Oil rig drills help us meet our energy needs. Drilling machines perform the essential task of digging holes, which is a necessary task for most construction companies. Holes for underground water pipes, telephone poles, signs and building foundations are needed on a regular basis, and drilling machines come in a variety of designs to fit each job.

Pull Boring
Pull boring is a drilling technique that enlarges an existing bore, which is a hole that is being drilled and widened. Pull boring relies on tension, rather than compression, and provides better control over the straightness of the hole. Pull boring can also be used to straighten existing holes as well as new holes, and pull boring tools can be made to follow center line of the machine. Pull boring is available in a wide variety of deep hole pneumatic drilling machines and horizontal drill bore machines.
Gun Drilling Machines
Gun drilling is usually done in diameters between one and 50 millimeters, or 0.04 to two inches. High pressure coolant is usually needed to prevent the machine from overheating or breaking under the extreme pressure and heat associated with gun drilling. Coolant is introduced through the spindle and tool center. Chips from the drilling process are discharged from a v-shaped groove on the outside of the body.
Ejector Drilling
Ejector drilling requires the use of deep hole drilling, industrial strength machines. Ejector drilling is also known as a dual tube system and consists of a drill head, an outer tube and an inner tube. High pressure coolant is injected in a space between the inner and outer tubes. Ejector drilling is typically used to retrofit existing lathes or hydraulic drill machine centers for deep hole drilling.
Trepanning
The trepanning drilling technique covers diameters up to 20 inches. Trepanning is preformed on a blank material, or one without pre-drilled holes. Trepanning leaves a solid core in the middle of the drilled hole, rather than removing the entire area of material. Trepanning uses less power and energy than traditional drilling.
More to Explore
Rock Drill Bit http://www.coaldrillmachine.com/coal-drill-bit/
Coal Mining Drill Rod http://www.coaldrillmachine.com/coal-drill-rod/