Sample Assessment Part A (Theory)

CHECK YOUR PROGRESS – POWER TOOLS - NAME:_______________

Theory

Go to Job PT8 Go to Job PT9

Question 1 (4 Marks)

Match the names and machines by writing the letter for the machines in the brackets beside the names.

( ) Bench grinder

( ) Bench drill

( ) Pedestal grinder

( ) Column drill

(a) (b)

.................

...........................

Question 2 (1 Mark)

Give one advantage of a column drill over a bench drill.

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Question 3 (1 Mark)

Why should you stand to the side of a pedestal grinder when you start it up?

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Question 4 (1 Mark)

Why should you change the speed of a fixed position drilling machine when you change drill bit sizes?

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Question 5 (16 Marks)

Some of the portable power tools below are shown overleaf. Match the tool with the letter.

A - Right angle electric drill	J - Jigsaw
B - Die grinder	K - Large pneumatic drill
C - Nibbler	L - Angle grinder
D - Straight air drill	M - Right angle battery drill
E - Battery drill	N - Electric pistol drill
F - Straight grinder	P - Battery screwdriver
G - Impact wrench	Q - Right angle pneumatic drill
H - Pneumatic pistol drill

Question 6 (1 Mark)

Why are portable drilling machines used instead of fixed position machines?

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Question 7 ( 2 Marks)

Give the names of two fixed position drilling machines.

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Question 8 (1 Mark)

How do you know which power source a portable power tool uses?

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Question 9 (1 Mark)

Which portable power tool removes the largest amount of material in its cutting action?

(a) jig saw

(b) nibbler

Question 10 (1 Mark)

Which portable power tool removes the least amount of material in its cutting action?

(a) jig saw

(b) nibbler

Question 11 (1 Mark)

Which portable power tool is most likely to cause distortion?

(a) jig saw

(b) nibbler

Question 12 (1 Mark)

Which portable power tool can cut through the thickest material?

(a) jig saw

(b) nibbler

Question 13 (1 Mark)

Which portable grinder is most suitable to be used as a cut off machine?

(a) angle grinder

(b) die grinder

Question 14 (1 Mark)

Which portable grinder is used for delicate grinding operations?

(a) angle grinder

(b) die grinder

Question 15 (1 Mark)

What can happen when a scriber is overheated during grinding?

________________________________________________________________________

Question 16 (1 Mark)

The recommended maximum gap between work rest and grinding wheel is:

(a) 0 - l mm

(b) 1 - 2 mm

(d) 3 - 4mm

Question 17 (1 Mark)

A “glazed” grinding wheel is where:

(a) the abrasive grains are blunt

(b) particles of the work material are stuck to the cutting surface

(d) the users eyes are protected by a glass shield.

Question 18 (1 Mark)

“Truing” a grinding wheel involves:

(a) making sure it is the “right” or “true” wheel for the job

(b) preparing the surface of the wheel for grinding

(d) making sure the mounting shaft runs “true”.

Question 19 (1 Mark)

What is the purpose of a pilot hole when drilling?

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Question 20 (2 Marks)

Briefly explain how to draw the drill back on centre.

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Question 21 (1 Mark)

What is one problem caused by burrs on a drilling machine table?

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Question 22 (1 Mark)

Why should a portable power grinder be checked for faults?

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Question 23 (1 Mark)

Explain one consideration in the selection of a portable power tool to do a job.

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Practical

Job PT 8

Tool Re-Sharpening

Task

To re-sharpen the following tools on an off-hand grinder.

Centre punch Scriber Cross cut chisel

Safety

Follow workplace safety procedures and requirements at all times.

Instructions

1 Re-sharpen the three tools above.

2 Submit the three tools to your teacher for assessment.

Quality Requirements

To pass this exercise:

• each tool must:

- be ground within specifications

- not have been overheated during grinding

• you must follow workplace safety standards at all times

• tools must be stored appropriately.

Job PT 9

Off-Hand Grinding And Drilling With Fixed And Portable Tools

Task

Use power tools to produce the two components.

Instructions

1 Write a job sheet.

2 Make the above cover plate & gasket in 2.5 mm aluminium plate.

3 Tolerances: Linear - 0.25, Angular - ± 0.5°

Answers