28-09-2012, 01:02 PM
Drilling Machine…
drilling.ppt (Size: 1.29 MB / Downloads: 103)
Drilling
Drilling is the operation of producing circular hole in the work-piece by using a rotating cutter called DRILL.
The machine used for drilling is called drilling machine.
The drilling operation can also be accomplished in lathe, in which the drill is held in tailstock and the work is held by the chuck.
The most common drill used is the twist drill.
Drilling Machine
It is the simplest and accurate machine used in production shop.
The work piece is held stationary ie. Clamped in position and the drill rotates to make a hole.
Types :-
a) Based on construction:
Portable, Sensitive,Radial, up-right, Gang, Multi-spindle
b)Based on Feed:
Hand and Power driven
Drill Materials
The two most common types are
1. HSS drill
- Low cost
2. Carbide- tipped drills
- high production and in CNC machines
Other types are
Solid Carbide drill, TiN coated drills, carbide coated masonry drills, parabolic drills, split point drill
Tool Holding devices
The different methods used for holding drill in a drill spindle are
By directly fitting in the spindle hole.
By using drill sleeve
By using drill socket
By using drill chuck
Precautions for Drilling 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
Safety Precautions
Do not support the work piece by hand – use work holding device.
Use brush to clean the chip
No adjustments while the machine is operating
Ensure for the cutting tools running straight before starting the operation.
Never place tools on the drilling table
Avoid loose clothing and protect the eyes.
Ease the feed if drill breaks inside the work piece.
drilling.ppt (Size: 1.29 MB / Downloads: 103)
Drilling
Drilling is the operation of producing circular hole in the work-piece by using a rotating cutter called DRILL.
The machine used for drilling is called drilling machine.
The drilling operation can also be accomplished in lathe, in which the drill is held in tailstock and the work is held by the chuck.
The most common drill used is the twist drill.
Drilling Machine
It is the simplest and accurate machine used in production shop.
The work piece is held stationary ie. Clamped in position and the drill rotates to make a hole.
Types :-
a) Based on construction:
Portable, Sensitive,Radial, up-right, Gang, Multi-spindle
b)Based on Feed:
Hand and Power driven
Drill Materials
The two most common types are
1. HSS drill
- Low cost
2. Carbide- tipped drills
- high production and in CNC machines
Other types are
Solid Carbide drill, TiN coated drills, carbide coated masonry drills, parabolic drills, split point drill
Tool Holding devices
The different methods used for holding drill in a drill spindle are
By directly fitting in the spindle hole.
By using drill sleeve
By using drill socket
By using drill chuck
Precautions for Drilling 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
Safety Precautions
Do not support the work piece by hand – use work holding device.
Use brush to clean the chip
No adjustments while the machine is operating
Ensure for the cutting tools running straight before starting the operation.
Never place tools on the drilling table
Avoid loose clothing and protect the eyes.
Ease the feed if drill breaks inside the work piece.