Engineering Technology September 2022 2

Choose the correct answer........

A ………… is a tool used to cut internal threads in a drilled hole.

• Tap

• Outside Micrometer

• Depth Micrometer

• Centre punch

Choose then correct answer........

The …………… switch is only used when drilling into concrete, brick or other masonry materials.

• Hammer Action

• Centre Punch

• Pin Punch

• Outside Micrometer

Choose then correct answer........

…………. is mainly used to measure the outside diameter or external size of an object.

• Outside Micrometer

• Depth Micrometer

• Inside caliper

• Outside caliper

 

Choose then correct answer........

The ………… is supplied with several interchangeable rods for accurately measuring different depths.

• Depth Micrometer

• Inside Micrometer

• Outside Micrometer

• Vernier Caliper

Choose then correct answer........

A ……….. is used to mark the centre of holes to be drilled.

• Centre punch

• Aligning punch

• Pin punch

• Dotting punch

You are asked to manufacture the MACHINE BLOCK (FIGURE 1) below. Study the diagram and answer the questions that follow.

Name the power tool that you would use to obtain an accurate hole of diameter 8 mm at point A.

HINT: The use of a portable drilling machine is NOT allowed due to the high accuracy needed.

(a)  

From a safety perspective, when using a pedestal drilling machine, you must ensure the following .......

• Wear safety goggles

• Wear a hairnet

• Wear a helmet

• Tuck away loose clothing

Explain what is meant by the term M10 as indicated at point B.

• M10 indicates that the hole has threads cut with an M10 tap.

• M10 means micro 10 mm

• M10 Means metric nuts

• M10 indicates the hole has a depth of 10 mm

After the hole has been drilled to the correct size at point B (M10), name the hand tools that you would require to make the hole

• A set of M10 Taps and a Tap wrench.

• A Tap

• A die

• A hacksaw

Explain what will happen if the drilled hole at point B is too small

• The tap will break

• The tap will fall through the hole

• Nothing will happen

• The tap will fit perfect in the hole