EXERCISE NO. 4 - HAND TOOLS - ANSWERS

                                                             PART 1- USAGE

A.  Match the best tool for the task below:

                Prick punches                    Centre punches         Taper drift punches       Pin punches

a.  To start driving out tight parallel pins, use                                                Taper drift punches

b.  To drive out loosened taper pins, use                                                       Pin punches

c.  To provide witness marks to locate the pivot points of dividers, use.    Prick punches

d.  To locate centre positions that make it easier to start drilling                 Centre punches

 

2. Choose the hacksaw blades best suited for the tasks a-e below:

Low tungsten steel flexible blades with pitches as follows:         

(a) 24 TPI

(b) 18 TPI

(c) 14 TPI

High speed steel all hard blades with pitches as follows:           

(d) 32 TPI

(e) 24 TPI

(f) 18 TP

(g) 14 TPI

a.  To cut accurate lengths from a length of 19 mm diameter alloy steel, use ...........f

b.  To cut accurate lengths from a length of 16 mm diameter mild steel, use ...........g

c.  To cut the. ends off 10 mm brass bolts in an awkward position, use ....................b

d.  To cut accurate lengths from 25 mm diameter thin‑wall steel tubes, use ............d.

e.  To cut a strip off the edge of a sheet of 3 mm thick aluminium, use ......................a

3. Select the chisel best suited for the tasks a-d.

(a) Flat chisel                             (b) Side cutting chisel                 (c) Diamond point chisel

(d) Cross cut chisel                   (e) Round nose chisel

a.  To draw over a drill point that has begun to cut off centre, use..........c  e.........................

b.  To cut out the length of a narrow groove, use   .....................              d..............................

c.  To cut a piece out of a thin metal template, use ..............                   a..............................

d.  To chip out a weld that has cracked, use......................                       c..............................

 

4.         Match the letter with the correct tool.

1.	half round scraper	( 5 )		11.	adjustable depth gauge	( 11 )
2.	rule	(17)		12.	hand tap	( 13 )
3.	flat file	( 3 )		13.	engineer’s square	( 12 )
4.	half round file	(10)		14.	combination set	( 9 )
5.	measuring tape	(14)		15.	centre square	( 20 )
6.	scriber	( 7 )		16.	Hacksaw	( 18 )
7.	flat chisel	(15)		17.	button die	( 4 )
8.	trammels	( 8 )		18.	twist drill	( 19 )
9.	centre punch	( 1 )		19.	jenny callipers	( 6 )
10.	ball peen hammer	( 2 )		20.	Dividers	( 16 )

5      

•        Marking ink

    •        Chalk

    •        White wash or water base paint

    •        Copper sulphate

6      

•        Cracks or other defects in the casting

    •        That the material is distributed correctly

    •        The size of the marking out

    •        The correct material is being used

7          (i)

8          Trammels are used for scribing very large arcs while marking off.

9       The teeth of a hacksaw should always face the front and the cutting is done on the forward stroke.

10     A fine pitch blade is used when cutting thin material. As a rule you always aim to use a blade which will have at least 3 teeth in contact with the work at any one time. Then there’s less chance of breaking teeth.

11     Prick punch along the line after marking off and file until the prick punch marks are cut in half.

12     The head has a mushroom shape, which can cause 2 problems

          •        The sharp edges on the underside of the head can be driven into your hand by the force of the hammer

          •        Small pieces from the underside of the head can fly off and hit you or a workmate.

13     Show a try square or square ended rule being used to check squareness from face of job to side of tap.