Carpentry and Joinery by y2DzCMN

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									  Carpentry and Joinery
Module 4: Machinery and Joinery
  Unit 6: Morticing (Chisel)
         Phase 2
Carpentry & Joinery – Phase 2                                        Module 4

                                                 Table of Contents
List of Figures .................................................................................................................... 4

List of Tables ..................................................................................................................... 5

Document Release History ............................................................................................... 6

Module 4 – Machinery and Joinery ................................................................................ 7
   Unit 6 – Morticing (Chisel) ............................................................................................ 7
    Learning Outcome: ..................................................................................................... 7
    Key Learning Points: .................................................................................................. 7
    Training Resources: .................................................................................................... 8
    Exercise: ...................................................................................................................... 8
    Key Learning Points Code: ......................................................................................... 8

Mortiser ............................................................................................................................. 9
   Chain Mortiser Safety ................................................................................................... 10
   Hollow Chisel Mortiser Safety ..................................................................................... 10
   Chisels and bitts ............................................................................................................ 12

Self Assessment................................................................................................................ 14

Index ................................................................................................................................. 15




Unit 6                                                                                                                                  3
Carpentry & Joinery – Phase 2                                Module 4

List of Figures
Figure 1.   Mortiser ........................................................................................................... 9
Figure 2.   Machining mortises ....................................................................................... 10
Figure 3.   Parts of a mortiser ......................................................................................... 11
Figure 4.   Hollow mortise chisel ................................................................................... 12
Figure 5.   Isolation switch ............................................................................................. 13
Figure 6.   On/Off switch................................................................................................ 13




Unit 6                                                                                                                          4
Carpentry & Joinery – Phase 2   Module 4

List of Tables




Unit 6                                     5
Carpentry & Joinery – Phase 2        Module 4

Document Release History

 Date                      Version              Comments

 October 2006              V.1.0.




Unit 6                                                     6
Carpentry & Joinery – Phase 2                  Module 4

Module 4 – Machinery and Joinery
Unit 6 – Morticing (Chisel)
Duration – 7 Hours
Learning Outcome:
By the end of this unit each apprentice will be able to:
        State the purpose of a chisel morticer.
        Identify and state the names of the various parts of a chisel morticer.
        Identify correct method of operating locking levers and devices.
        Describe correct method of fitting and adjusting chisel auger.
        Identify correct method of sharpening and maintaining chisel/auger.
        Define different sizes of chisels.
        Operate chisel morticer to cut a mortice.
        Summarise wood working regulations related to chisel morticer.
        Identify hazards, apply safe working and house keeping practices.
        Record the process of operating a chisel morticer.
Key Learning Points:

 RK        Purpose of chisel morticers.

 RK        Parts of chisel morticer.

 RK        Method of operating locking levers and devices/chisel and auger.

 SK        Operation of cutting mortice.

 RK        Range of sizes of chisels.

 SK        Sharpening and maintaining chisel/auger.

 RK        Woodworking regulations related to chisel morticer.

 RK        Safety regulations and safety devices.

 RK        Housekeeping.

 RK        Safe work practice.

 H         Identification of hazards/chisel morticer.

 P         Information gathering re chisel morticer.

 P         Report Writing.



Unit 6                                                                             7
Carpentry & Joinery – Phase 2                  Module 4

Training Resources:
        Chisel morticers.
        Full range of chisels, augers.
        Set of pilots and reamers.
        Set of questions.
        Handout on tool design maintenance.
Exercise:
Complete exercises in this document.
Key Learning Points Code:
M = Maths             D= Drawing       RK = Related Knowledge Sc = Science
P = Personal Skills    Sk = Skill       H = Hazards




Unit 6                                                                       8
Carpentry & Joinery – Phase 2               Module 4

Mortiser




                                Figure 1.     Mortiser

A mortiser is a woodworking machine used for taking mortises out of timber. There are
two main types of hand operated mortiser machines:

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Carpentry & Joinery – Phase 2                  Module 4

1. Chain:
   Which has a cutting chain that runs around a guide bar, similar to a chain saw, see
   Figure 2; Machining mortises. A chip breaker needs to be fitted to the exit side or the
   upward side of the chain to prevent the side of the mortiser breaking out.
2. Hollow chisel:
   This is fitted with a twist-bit, surrounded by a square chisel case, working in a
   vertical plane and a horizontal moveable table. The bit bites into the timber whilst the
   chisel removes the corners to make square holes, see Figure 2; Machining mortises. A
   mortiser is used to produce accurate square or rectangular holes perpendicular to the
   surface of the stock, i.e. mortisers.




                            Figure 2.       Machining mortises
A chisel mortiser produces a neater cut mortise, but in a situation where productivity is
important a chain mortiser is often used because of its ability to cut mortises at a greater
speed.

Chain Mortiser Safety
Read the following carefully:
1.   Chain guard to be fitted and adjusted corrective for each operation.
2.   Chain tension to be set to manufacturer’s specification and checked regularly.
3.   Chain drive spindle to be checked regularly for true running.
4.   Care must be taken that the timber is safely secured by clamps.

Hollow Chisel Mortiser Safety
Read the following carefully:
1. The machine should always be switched off before making any adjustments.
2. Care must be taken that the timber is safely secured by clamps.
3. The key for locking the bits in relation to the chuck should always be removed and
   put in a proper receptacle before starting the machine.
4. Safety hair cap should be worn while working this machine.

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Carpentry & Joinery – Phase 2              Module 4




                             Figure 3.    Parts of a mortiser
Refer to Figure 3; Parts of a mortiser:
1. Motor.
2. Handle.


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Carpentry & Joinery – Phase 2                 Module 4

3.   Bit.
4.   Holding clamp.
5.   Travers wheel.
6.   Depth adjustment.

Chisels and bitts
Various sizes of chisels and bitts are available from 6mm square to 25mm square. In
order to accommodate this range of bitts, different sizes of collets must be fitted to both
the chisel and the bit so that they can be tightened correctly.




                           Figure 4.       Hollow mortise chisel


Figure 4; Hollow mortise chisel shows a hollow mortise chisel and bit fitted with a collet
into the mortiser. From Figure 4 you can see the space in the side of the chisel which
allow for the timber to clear the bit.
When setting up, the bit is fitted in such a way that it protrudes between 1mm and 2mm
below the chisel. This prevents friction and overheating of the bit and the chisel, which
may cause a split in the chisel.



Unit 6                                                                                        12
Carpentry & Joinery – Phase 2                 Module 4




                              Figure 5.      Isolation switch


Refer to Figure 5; Isolation switch. Before setting up or adjusting, the machine must be
isolated. The isolation switch in Figure 5, is in the ON Position, “I”. To isolate the power
from the machine it must be in the Horizontal position, or pointed to “O”.




                               Figure 6.      On/Off switch




Unit 6                                                                                    13
Carpentry & Joinery – Phase 2   Module 4

Self Assessment




Unit 6                                     14
Carpentry & Joinery – Phase 2                                                         Module 4

Index

  B                                                                                        M
Bitts .......................................................................... 12
                                                                                         Mortiser ...................................................................... 9
                                                                                           Chain................................................................... 10
  C                                                                                        Hollow ................................................................ 10
Chain mortiser ........................................................ 10
Chain Mortiser Safety ............................................... 10                   S
Chisels and bitts ........................................................ 12
                                                                                         Safety
                                                                                            Chain Mortiser .................................................... 10
  H                                                                                         Hollow Chisel Mortiser....................................... 10
Hollow Chisel Mortiser Safety ................................. 10
Hollow mortiser ...................................................... 10




Unit 6                                                                                                                                                                15

								
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