Drilling Machine

Drilling Machine
Chapter-4
 Drilling machines
 Any component manufactured has one or more cylindrical hole in them.
 The process of making a hole is known a drilling.
 The cutting tool, which is used for making holes, is known as drill.
 The drill is a multipoint cutting tool.
 Definition: Drilling is the operation of making holes in a work piece using a drill bit.
 The hole is generated by the rotating drill, which exerts large force on the work piece clamped rigidly on the machine table.
 What is a Drilling machine ?
 A power operated machine tool, which holds the drill in its spindle rotating at high speeds and when manually actuated to move linearly simultaneously against the work piece produces a hole.
 Drilling machines
 Types Of Drilling Machines
• Portable drilling machine
• Bench Drilling Machine (Sensitive drilling machine)
• Upright drilling machine
• Radial drilling machine
• Gang drilling machine
• Multiple spindle drilling machine
• Automatic drilling machine
• Deep hole drilling machine.
 Portable drilling machine
 It is a small and compact machine, which can be conveniently held by hand, and drilling operations can be carried out.
 These machines are used to drill small holes in large work piece.
 Portable machines run at high speeds, powered by electrical motor or pneumatic.
 The maximum diameter of hole it can drill is 12 mm. The feed is applied by hand.
 Portable drilling machine
 Portable drilling machine
 Bench Drilling Machine (Sensitive Drilling Machine)
 Bench drilling machine
 These are light duty machines used in small workshops.
 Also called Sensitive drilling machines because of its accurate and well balanced spindle.
 Holes of diameter 1 mm to 15 mm.
 The main parts of the machine
The main parts of the machine are
 Base,
 Vertical main column,
 Moving head
 Work table,
 Spindle and
 Driving mechanism.
 Bench Drilling Machine

 Upright Drilling