Drilling

• Drilling is an operation of producing circular hole in a work-piece by using a rotating cutter called DRILL.
• The machine used for drilling process is called drill machine.
• The drilling operation can also be accomplished in lathe in which drill is held in tailstock and work piece is held by chuck.
• The most common drill tool used is called TWIST DRILL.

DRILL MACHINE: It is the simplest and accurate machine used in production shop. The work piece is held stationary i.e. Clamped in position and the drill rotates to make a hole.

TYPES Of Drilling Machines: 

Sensitive drilling machine: Drill holes from 1.5 mm to 15 mm . Operator senses the cutting action so sensitive drilling machine.

Sensitive drill.

Up-right drilling machine: This type of machine can drill holes up to 50 mm .Table can move vertically and radially.

up-right drill

Radial drilling machine: It the largest and most versatile used form of drilling medium for large and heavy work pieces.

radial drill

Tool Nomenclature:

Precautions for drill machine: 

• Lubrication is important to remove heat and friction.
• Machines should be cleaned after use
• Chips should be removed using brush.
• T-slots, grooves, spindles sleeves, belts, pulley should be cleaned.
• Machines should be lightly oiled to prevent from rusting.

1. 
   
2.