- 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.
