Unit 4 Machine Tools Machine Tools (Basic Elements,

Unit 4 Machine Tools Machine Tools (Basic Elements,

Unit 4 Machine Tools Machine Tools (Basic Elements, Working principle and Types of Operations) Lathe Machine Centre Lathe Drilling Machine Radial Drilling Machine

Grinding Machine -Surface grinding, cylindrical grinding, centerless grinding, All operations Drilling Drilling is the operation of originating a cylindrical hole Hole is generated by rotating cutting edges of drill, which exerts large force on the WP to originate a hole.

Drill WP Principle of Drilling Machine Drilling is an operation of generating a hole of different diameters by means of rotating cutting tools of different diameters. The tool used for drilling hole is called as drill. Similar operations like boring, reaming, counter boring,

counter sinking, tapping etc. are also performed with the drilling machine. This is done by holding the tools rigidly in the tool holding device know as Chuck. Thus in this machining operation the tool is rotating one while the work piece is stationary one, which rests on the working table. Types of Drilling Machines Portable Drilling Machine

Sensitive Drilling Machine Pillar/Upright Drilling Machine Radial Drilling Machine Gang Drilling Machine Multiple Spindle Drilling Machine Automatic Drilling Machine Deep Hole Drilling Machine Drilling Machine

Twist Drill Major Components of Drill Machine Base Column Table Head Spindle

Spindle drive and feed mechanism Major Components of Drill Machine 1. Base It is a part of the machine on which the vertical column is mounted. 2. Column It is the vertical member of the drilling machine. It supports table and the head including driving mechanism. 3. Table

It is mounted on the column. T slots are provided on it to clamp the work piece on it. The table may be of circular or rectangular in shape. The position of the table can be adjusted vertically on the column to hold the work piece at different height below the drill tool. 4. Head It is mounted on the top of the column. It consists of driving and feeding mechanism for the spindle. 5. Spindle Spindle is a vertical shaft which holds the chuck and drill. Rotary motion of the spindle

is given directly to the tool to cut the material from the work piece. 6. Spindle drive and feed mechanism Multiple speeds may be obtained by a step cone pulley drive or by gear. Feed mechanism provided in drilling machine is either by quick reverse hand feed or by sensitive hand feed. The feed movement may be controlled by hand or power. PILLAR / UPRIGHT DRILLING MACHINE Sensitive Drilling Machine

Drill holes from 1.5 to 15mm Operator senses the cutting action so sensitive

drilling machine Up-Right Drilling Machine Drill holes upto 50mm Table can move vertically

and radially Radial Drilling Machine It the largest and most versatile used fro drilling medium to

large and heavy work pieces. Operations performed on the Drilling Machine 1. Drilling 2. Reaming 3. Boring

4. Counter boring 5. Countersinking 6. Tapping 7. Grinding

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