Week 7 – SS2 Third Term Technical Drawing Notes

WEEK SEVEN
TOPIC: ENGINEERING DRAWING IN FREEHAND SKETCHING INCLUDING BOTH PICTORIAL AND ORTHOGRAPHIC SKETCHES OFENGINEERING COMPONENTS.
CONTENTS:
(i) Freehand sketching of engineering tools and components.
(ii) Examples of Engineering machines

• Engineering Tools

  Below are the diagrams of some of the tools used in an engineering workshop.
  
  
  
  

   
   
   
   
   

   
   
   
   
   
   

   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
   

   
   
   
   

   
   
   
   
   
  

   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   

   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   fig Twist drill
  
   
   EVALUATION
  1. State three types of marking-out, driving and measuring tools.
  2. Sketch the following engineering tools, components or symbols using freehand sketching : Hacksaw, Sledge hammer, Pein hammer, Claw hammer, Bench vice, Chisel, Scriber, File, Twist drill, Gimlet, Gib head key , Cotter pin, Hardie, Bick iron, Slotted nut, Castle nut, Spanner, Tool maker’s clamp, Countersunk, Counter bore, Mallet, Venier calliper, Micrometer screw gauge, Split pin, Spring washer, Wing nut, Thumb screw, Grub screw, Spirit level, Hand trowel, Stud, Splined shaft, Serrated shaft, Diamond knurled surface, Straight knurled surface , Journal bearing, Split bearing, Footstep bearing, Thrust bearing, Ball bearing, Roller bearing, compression spring( schematic), Tension spring( schematic), Tri-square, a pair of pincers, a pair of pliers, gimlet, etc.

   Engineering Machines
  Below are diagrams of some machines used in engineering workshops
  

   
   
   
   
   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   

   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   EVALUATIONs
  1. State four types of machine used in a mechanical engineering workshop.
  2. Sketch a labelled diagram of a centre lathe machine. State its uses.

   READING ASSIGNMENT
  Visit www.google.com for types of engineering tools and components.

   WEEKEND ASSIGNMENT
  Objective
  1. What is the name of the engineering tool used in compacting soil shown below? A. Hammer. B. Rammer.
  C. Box. D. Mallet.
      
   
   
   
   2. The following tools are suitable for removing fastened nail from a wood except a A. crow bar. B. pair of
  pliers. C. chisel. D. pair of pincers.
  3. The sheet metal tool shown below is a/an A. anvil. B. bick iron. C. swage block. D. hammer.

   
   
   
   
   
   4. The figure shown below can be identified as aA. lock nut. B. thrust bearing. C. shaft. D. key.
  

   
   
   
   5. The engineering tool shown below can be identified as a/an A. wood. B. hammer. C. spirit level.
  D. gimlet

   
   
   
   
   
   Theory
  1. Draw a well-labelled diagram of a twist drill bit.
  2. Sketch the diagrams of the following tools. Bick-iron, Gimlet, Hacksaw, Chisel and a pair of pliers.