MACHINE TOOL Prof kiran gore Contents Lathe machine

MACHINE TOOL Prof. kiran gore

Contents Ø Lathe machine Ø Drilling machine Ø Grinding machine

D R I L L I N G M A C H I N E

Drilling machine: Drilling is an operation through which holes are produced in solid material by using a revolving tool which is called as a drill & the machine used for producing a hole in the solid material is called as drilling machine.

BASIC ELEMENTS OF DRILLING MACHINE The drilling machine consist of following principle parts: - 1. 2. 3. 4. 5. Base Column Work table Drill head Spindle drive

Drill head Spindle Column Work table BASE

Drive mechanism for drilling machine

TYPES OF DRILLING MACHINE 1) Portable drilling machine 2) Sensitive or bench drilling machine 3) Upright drilling machine 4) Radial drilling machine 5) Gang drilling machine

Portable drilling machine

2) Sensitive or bench drilling machine: - Drill holes from 1. 5 to 15 mm

SENSITIVE DRILLING MACHINE

SENSITIVE DRILLING MACHINE

3) Upright drilling machine: • Drill holes up to 50 mm • Table can move vertically and radially

Upright drilling machine

4) Radial drilling machine It the largest and most versatile used for drilling medium to large and heavy work pieces.

Based on the type & number of movements possible the radial drilling machine can be grouped as 1) 2) 3) Plain radial drilling machine Semi universal radial drilling machine

1. Plain radial drilling machine In these type of machine three principle movements are possible 1) Vertical movement of the arm along the column 2) Horizontal movement of the drill head along the column 3) Swinging movement of the arm in horizontal plane about the vertical column

2. Semi universal radial drilling machine • In these type of machine in addition above three movements , the drill head can be swung about the horizontal axis which is normal to the arm. • This fourth movement of the drill head enables drilling of holes at desired inclination with the normal vertical position

3. universal radial drilling machine • In these machine, the arm itself can be rotated through desired angle along the horizontal axis. • These is an addition to the four movement available on a semi-universal drilling machine. • All these five movements in universal machine enable it to drill on the work piece at any angle.

5) Gang drilling machine

DRILLING MACHINE OPRATION The different operations performed on the drilling are as 1. Drilling 2. Boring 3. Counter boring 4. Reaming 5. Counter sinking 6. Tapping

1) Drilling is the operation of producing a circular hole in a solid metal by using a revolving tool is called as drill. The drill is a multiple point cutting tool.

2) Boring is a process of enlarging a drilled hole by using an adjustable cutting tool called as boring tool. The boring operation is used to finish a drilled hole to accurate size and to correct the roundness of hole.

3) Counter boring The operation which is used for enlarging only limited portion of the hole is called as counter boring & the tool used for this purpose is called as counter bore.

4) Reaming is an operation of finishing already drilled hole. Material removal in reaming is negligible. The tool used for reaming operation is called as a reamer.

5) Counter sinking operation is used for enlarging the end of the hole and give it a conical shape for a short length. The tool used for this operation is called a counter sink.

6) Tapping is the process of making threads in a drilled hole. The tool used for tapping is called a Tap.

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