Module 4 General Purpose Machine Tools Notes | EduRev

: Module 4 General Purpose Machine Tools Notes | EduRev

 Page 1


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Module  
4  
General Purpose 
Machine Tools 
Version 2 ME, IIT Kharagpur 
Page 2


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Module  
4  
General Purpose 
Machine Tools 
Version 2 ME, IIT Kharagpur 
 
 
 
 
 
 
 
 
Lesson 
18  
 Kinematic system and 
operations of drilling 
machines 
Version 2 ME, IIT Kharagpur 
Page 3


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Module  
4  
General Purpose 
Machine Tools 
Version 2 ME, IIT Kharagpur 
 
 
 
 
 
 
 
 
Lesson 
18  
 Kinematic system and 
operations of drilling 
machines 
Version 2 ME, IIT Kharagpur 
 
 
Instructional Objectives  
 
At the end of this lesson, the students will be able to : 
(i)    State the basic purposes of use of drilling machines 
(ii)   Classify the types of drilling machines 
(iii)  Illustrate the general kinematic system of drilling machine and     
        explain its working principle 
(iv)  State and visualise the various common and other possible  
       applications of drilling machines 
 
 
(i)  Basic purposes of use of drilling machines 
 
Drilling machines are generally or mainly used to originate through or blind 
straight cylindrical holes in solid rigid bodies and/or enlarge (coaxially) existing 
(premachined) holes : 
• of different diameter ranging from about 1 mm to 40 mm 
• of varying length depending upon the requirement and the diameter 
of the drill 
• in different materials excepting very hard or very soft materials like 
rubber, polythene etc. 
 
(ii)  Classification of drilling machines. 
 
(a)  General purpose drilling machines of common use 
• Table top small sensitive drilling machine 
These small capacity ( = 0.5 kW) upright (vertical) single spindle drilling 
machines are mounted (bolted) on rigid table and manually operated 
using usually small size ( f= 10 mm) drills. Fig. 4.2.1 typically shows one 
such machine. 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 4.2.1  Table top sensitive drilling machine 
Version 2 ME, IIT Kharagpur 
Page 4


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Module  
4  
General Purpose 
Machine Tools 
Version 2 ME, IIT Kharagpur 
 
 
 
 
 
 
 
 
Lesson 
18  
 Kinematic system and 
operations of drilling 
machines 
Version 2 ME, IIT Kharagpur 
 
 
Instructional Objectives  
 
At the end of this lesson, the students will be able to : 
(i)    State the basic purposes of use of drilling machines 
(ii)   Classify the types of drilling machines 
(iii)  Illustrate the general kinematic system of drilling machine and     
        explain its working principle 
(iv)  State and visualise the various common and other possible  
       applications of drilling machines 
 
 
(i)  Basic purposes of use of drilling machines 
 
Drilling machines are generally or mainly used to originate through or blind 
straight cylindrical holes in solid rigid bodies and/or enlarge (coaxially) existing 
(premachined) holes : 
• of different diameter ranging from about 1 mm to 40 mm 
• of varying length depending upon the requirement and the diameter 
of the drill 
• in different materials excepting very hard or very soft materials like 
rubber, polythene etc. 
 
(ii)  Classification of drilling machines. 
 
(a)  General purpose drilling machines of common use 
• Table top small sensitive drilling machine 
These small capacity ( = 0.5 kW) upright (vertical) single spindle drilling 
machines are mounted (bolted) on rigid table and manually operated 
using usually small size ( f= 10 mm) drills. Fig. 4.2.1 typically shows one 
such machine. 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 4.2.1  Table top sensitive drilling machine 
Version 2 ME, IIT Kharagpur 
• Pillar drilling machine 
These drilling machines, usually called pillar drills, are quite similar to the 
table top drilling machines but of little larger size and higher capacity 
(0.55 ~ 1.1 kW) and are grouted on the floor (foundation). Here also, the 
drill-feed and the work table movement are done manually. Fig. 4.2.2 
typically shows a pillar drill. These low cost drilling machines have tall 
tubular columns and are generally used for small jobs and light drilling. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 4.2.2   Pillar Drilling machine 
 
• Column drilling machine 
These box shaped column type drilling machines as shown in Fig. 4.2.3 
are much more strong, rigid and powerful than the pillar drills. In column 
drills the feed gear box enables automatic and power feed of the rotating 
drill at different feed rates as desired. Blanks of various size and shape 
are rigidly clamped on the bed or table or in the vice fitted on that. Such 
drilling machines are most widely used and over wide range ( light to 
heavy) work. 
 
 
 
 
 
 
 
 
 
 
 
 
Version 2 ME, IIT Kharagpur 
Page 5


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Module  
4  
General Purpose 
Machine Tools 
Version 2 ME, IIT Kharagpur 
 
 
 
 
 
 
 
 
Lesson 
18  
 Kinematic system and 
operations of drilling 
machines 
Version 2 ME, IIT Kharagpur 
 
 
Instructional Objectives  
 
At the end of this lesson, the students will be able to : 
(i)    State the basic purposes of use of drilling machines 
(ii)   Classify the types of drilling machines 
(iii)  Illustrate the general kinematic system of drilling machine and     
        explain its working principle 
(iv)  State and visualise the various common and other possible  
       applications of drilling machines 
 
 
(i)  Basic purposes of use of drilling machines 
 
Drilling machines are generally or mainly used to originate through or blind 
straight cylindrical holes in solid rigid bodies and/or enlarge (coaxially) existing 
(premachined) holes : 
• of different diameter ranging from about 1 mm to 40 mm 
• of varying length depending upon the requirement and the diameter 
of the drill 
• in different materials excepting very hard or very soft materials like 
rubber, polythene etc. 
 
(ii)  Classification of drilling machines. 
 
(a)  General purpose drilling machines of common use 
• Table top small sensitive drilling machine 
These small capacity ( = 0.5 kW) upright (vertical) single spindle drilling 
machines are mounted (bolted) on rigid table and manually operated 
using usually small size ( f= 10 mm) drills. Fig. 4.2.1 typically shows one 
such machine. 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 4.2.1  Table top sensitive drilling machine 
Version 2 ME, IIT Kharagpur 
• Pillar drilling machine 
These drilling machines, usually called pillar drills, are quite similar to the 
table top drilling machines but of little larger size and higher capacity 
(0.55 ~ 1.1 kW) and are grouted on the floor (foundation). Here also, the 
drill-feed and the work table movement are done manually. Fig. 4.2.2 
typically shows a pillar drill. These low cost drilling machines have tall 
tubular columns and are generally used for small jobs and light drilling. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 4.2.2   Pillar Drilling machine 
 
• Column drilling machine 
These box shaped column type drilling machines as shown in Fig. 4.2.3 
are much more strong, rigid and powerful than the pillar drills. In column 
drills the feed gear box enables automatic and power feed of the rotating 
drill at different feed rates as desired. Blanks of various size and shape 
are rigidly clamped on the bed or table or in the vice fitted on that. Such 
drilling machines are most widely used and over wide range ( light to 
heavy) work. 
 
 
 
 
 
 
 
 
 
 
 
 
Version 2 ME, IIT Kharagpur 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 4.2.3   Column drilling machine 
 
• Radial drilling machine 
This usually large drilling machine possesses a radial arm which along 
with the drilling head can swing and move vertically up and down as can 
be seen in Fig. 4.2.4. The radial, vertical and swing movement of the 
drilling head enables locating the drill spindle at any point within a very 
large space required by large and odd shaped jobs. There are some 
more versatile radial drilling machines where the drill spindle can be 
additionally swivelled and / or tilted. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 4.2.4   Radial drilling machine 
 
 
 
Version 2 ME, IIT Kharagpur 
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