Description: Mobile Offshore Drilling Units (MODU) Hiring for offshore Painter, Offshore Jack up Drilling Rig Move Animation - Dorsea International - Offshore Animation, MODU- Mobile Offshore Drilling Unit, Oil Rig Towing #SingaporeStraits
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Drilling is a cutting process that uses a drill bit to cut or enlarge a hole of circular cross-section in solid materials. The drill bit is a rotary cutting tool , often multipoint. The bit is pressed against the workpiece and rotated at rates from hundreds to thousands of revolutions per minute . This forces the cutting edge against the workpiece, cutting off chips (swarf) from the hole as it is drilled.
Exceptionally, specially-shaped bits can cut holes of non-circular cross-section; a square cross-section is possible.
Drilled holes are characterized by their sharp edge on the entrance side and the presence of burrs on the exit side (unless they have been removed). Also, the inside of the hole usually has helical feed marks.