Lesson Notes By Weeks and Term - Junior Secondary School 3





Reference Materials







  • Definition of machine tools
  • Shaping machine
  • Planing machine
  • Milling machine
  • Grinding machine
  • The drill press 
  • The lathe machine 



Machine tools are machines used for metal work operation. There are five basic machine tools. This includes the following:

  1. Shaping machine
  2. Planing machine
  3. Milling machine
  4. Grinding machine
  5. The drill press 
  6. The lathe machine 



  1. Define machine tools
  2. State 6 machine tools 


The milling machine

A milling machine is a machine tool used to machine solid materials. Milling machines are often classed in two basic forms, horizontal and vertical, which refers to the orientation of the main spindle. Both types range in size from small, bench-mounted devices to room-sized machines. Unlike a drill press, which holds the workpiece stationary as the drill moves axially to penetrate the material, milling machines also move the workpiece radially against the rotating milling cutter, which cuts on its sides as well as its tip. Workpiece and cutter movement are precisely controlled to less than 0.001 in (0.025 mm), usually by means of precision ground slides and leadscrews or analogous technology. Milling machines may be manually operated, mechanically automated, or digitally automated via computer numerical control (CNC).

Milling machines can perform a vast number of operations, from simple (e.g., slot and keyway cutting, planing, drilling) to complex (e.g., contouring, diesinking). Cutting fluid is often pumped to the cutting site to cool and lubricate the cut and to wash away the resulting swarf.


Planing machine (Planer)

Metal-cutting machine tool in which the work piece is firmly attached to a horizontal table that moves back and forth under a single-point cutting tool. The tool-holding device is mounted on a cross rail so that the tool can be moved across the table in small sideward movements. Since the cutting tool can be moved at almost any angle, a wide variety of grooves and surfaces can be generated. Mechanical planers, or surfacers, are also used to smooth wood to an even thickness. Planers perform the same operations as shapers but can machine work pieces up to 50 ft (15 m) long.

A machine for the shaping of long, flat, or flat contoured surfaces by reciprocating the work piece under a stationary single-point tool or tools.


Milling machine

This is a machine tool that rotates a circular tool with numerous cutting edges arranged symmetrically about its axis, called a milling cutter. The metal work piece is usually held in a vise clamped to a table that can move in three perpendicular directions. Cutters of many shapes and sizes are available for a wide variety of milling operations. Milling machines cut flat surfaces, grooves, shoulders, inclined surfaces, dovetails, and T-slots. Various form-tooth cutters are used for cutting concave forms and convex grooves, for rounding corners, and for cutting gear teeth.

A machine for the removal of metal by feeding a work piece through the periphery of a rotating circular cutter. It is  known as miller.

The drill press 

This is m machine tool for producing holes in hard substances. The drill is held in a rotating spindle and is fed into the work piece, which is usually clamped in a vise supported on a table. The drill may be gripped in a chuck with three jaws that move radially in unison, or it may have a tapered shank that fits into a tapered hole in the spindle. Means are provided for varying the spindle speed and (on some machines) for automatically feeding the drill into the work piece. See also boring machine. A drilling machine, in which a vertical drill, moves into the work, which is stationary.


The lathe machine

Lathe (lāth), machine tool for holding and turning metal, wood, plastic, or other material against a cutting tool to form a cylindrical product or part. It also drills, bores, polishes, grinds, makes threads, and performs other operations. Its principal parts are the headstock (attached to the bed or base of the machine), which holds one end of the material in a rotating spur; the tailstock, which holds the other end, moves along the bed, and can be clamped in position at any point; the cutting tool; and the power feed, comprising the drive and its motive parts.

Machine tool that performs turning operations in which unwanted material is removed from a work piece rotated against a cutting tool. Lathes are among the oldest and most important machine tools, used in France from 1569 and important in the Industrial Revolution in England, when they were adapted for metal cutting. Lathes (usually called engine lathes) today has a power-driven, variable-speed horizontal spindle to which the work holding device is attached. Operations include turning straight or tapered cylindrical shapes, grooves, shoulders, and screw threads and facing flat surfaces on the ends of cylindrical parts. Internal cylindrical operations include most of the common hole-machining operations, such as drilling, boring, reaming, counter boring, countersinking, and threading with a single-point tool or tap. See also boring machine.

Lathe: A machine for shaping, boring, facing, or cutting a screw thread in metal, wood, etc., in which the work piece is turned about a horizontal axis against a fixed tool 

The lathe machine is regarded as the father of all machine tools because apart from being used for turning cylindrical surface (external and internal) it can perform other operations which are peculiar to other machines.

Thus, it is possible to carry out the following operations on the lathe machine: 

  • Turning (production of cylindrical of flat such as plumb bulb, centre punch)
  • Facing (production of flat surfaces)
  • Screw cutting (external and internal)
  • Grinding (external and internal)
  • Slotting 
  • Taper turning (production of conical surface ) 


Parts of the lathe machine

    1. Bed: This provides a plane surface for mounting and moving accessories at a constant level.
    2. Head stock: This holds the main spindle and houses the arrangement for driving and speed variation 
    3. Main spindle: This rotates the work and transmits movement to saddle. 
    4. Tailstock: It is used to support work being turned between centres.
    5. Saddle and cross slide: These are used for mounting the tool for cylindrical work.
    6. Lead screw: Moves the saddle at rates relative to the rotation of the work.
    7. Compound slide: This permit movement of the tools at angles other than a right angle (e.g. for conical work)
    8. Centres: These support work drilled at end centres
    9. Steadies: These support work to prevent bending. They can be either of fixed type bolted to the end of the bed, or of the traveling type bolted to the saddle which prevents vibration during machining of long and slender shafts.

Wood holding methods

Work holding methods on a lathe machine include: 

  • Catch and center: This method is used when matching ordinary work between centres. Matching between centres is used when chuck matching is impossible.
  • Face plate: The pace plate has slots for clamping or holding jobs with T-bolts 
  • Chuck: A chuck holds cylindrical work which is to be done in setting. It may be of the three-jaw, self-centering, chuck which grips irregular jobs more efficiently than three-jaw chuck.



A shaper is analogous to a planer, but smaller, and with the cutter riding a ram that moves above a stationary workpiece, rather than the entire workpiece moving beneath the cutter. The ram is moved back and forth typically by a crank inside the column; hydraulically actuated shapers also exist.


Shaper linkage. Note the drive arm revolves less for the return stroke than for the cutting stroke, resulting in a quicker return stroke and more powerful cutting stroke.

A shaper operates by moving a hardened cutting tool backwards and forwards across the workpiece. On the return stroke of the ram the tool is lifted clear of the workpiece, reducing the cutting action to one direction only.

The workpiece mounts on a rigid, box-shaped table in front of the machine. The height of the table can be adjusted to suit this workpiece, and the table can traverse sideways underneath the reciprocating tool, which is mounted on the ram. Table motion may be controlled manually, but is usually advanced by an automatic feed mechanism acting on the feedscrew. The ram slides back and forth above the work. At the front end of the ram is a vertical tool slide that may be adjusted to either side of the vertical plane along the stroke axis. This tool-slide holds the clapper box and toolpost, from which the tool can be positioned to cut a straight, flat surface on the top of the workpiece. The tool-slide permits feeding the tool downwards to deepen a cut. This adjustability, coupled with the use of specialized cutters and toolholders, enable the operator to cut internal and external gear tooth profiles, splines, dovetails, and keyways.

The ram is adjustable for stroke and, due to the geometry of the linkage, it moves faster on the return (non-cutting) stroke than on the forward, cutting stroke. This action is via a slotted link or whitworth link.


The most common use is to machine straight, flat surfaces, but with ingenuity and some accessories a wide range of work can be done. Other examples of its use are:


  1. State the function of the following: 
  • Shaping machine
  • Planing machine
  • Milling machine
  1. State the function of the following: 
  • Grinding machine
  • The drill press 
  • The lathe machine 


Reading Assignment 



Reference Materials   

  1. NERDC, Introductory Technology for JSS, book 3, pages 84 - 112
  2. EVANS, Introductory Technology for JSS, book 3, pages 116-123

Weekend Assignment 

  1. Which of the following is a machine tool (a) Circular sawing machine (b) Surface planing machine (c) Milling machine (d) Thicknessing machine  
  2. Which of the following is used to rotates the work and transmits movement to saddle of a lathe (a) the bed (b) the headstock (c) the saddle cross slide (d) main spindle 
  3. Which of the following provides a plane surface for mounting and moving accessories at a constant level on a lathe machine  (a) the bed (b) the headstock (c) the saddle cross slide (d) main spindle
  4. Which of the following permits movement of tool at angle other than right angle ( e.g. for conical work)  (a) the compound slide (b) the head stock (c) the slide cross slide (d) main spindle 
  5. The following are work holding methods except (a) catch and carrier (b) face plate (c) saddle  (d) chuck



  1. State the function of the following: 
  • Shaping machine
  • Planing machine
  • Milling machine
  1. State the function of the following: 
  • Grinding machine
  • The drill press 
  • The lathe machine 

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