4.4 Control Measures for Machinery Hazards

Question 1

the hierarchy for machinery guarding, which should be

applied so far as is ‘practicable’ is:

Answer 1

 Fixed guards
 Other guards or protection devices
 Protection appliances

Question 2

What is being described below:

provides a physical barrier between a person and the dangerous parts of machinery

Answer 2

A guard

Question 3

What is being described below:

stops the movement of the dangerous part before a person can reach it

Answer 3

a protection device

Question 4

What is being described below:

a jig, push-stick or holder, intended to keep the operators hands away from the dangerous parts

Answer 4

A protection appliance

Question 5

There are a few types of fixed guards.

Name a couple.

Answer 5

enclosing guard

distance guard

Question 6

Give a couple of examples of a distance guard

Answer 6

 a perimeter fence

 a tunnel guard

Question 7

What is being described below:

 Low cost 
 Easy to monitor by visual inspection 
 Can only be defeated by intentional act 
 Minimal ongoing maintenance – no 
moving parts or complex systems 
 May offer some protection from other 
hazards such as noise, dust or ejected 
parts and materials

Answer 7

Advantages of fixed guards

Question 8

What is being described below:

 Removal of the guard does not stop the machine
 If the guard needs to be removed regularly for maintenance it is likely to
be left off
 May impede operators view
 May impede ventilation

Answer 8

disadvantages of fixed guards

Question 9

What is being described below:

 Convenient where frequent access is
required
 Allow safe access when opened – machine is powered down

Answer 9

Advantages of interlocked guards

Question 10

What is being described below:

 Complex systems requiring regular 
testing and maintenance 
 Components may fail in use 
 May be defeated (spare keys, stuck contacts etc) 
 Failure may not be apparent until 
after an incident

Answer 10

disadvantages of interlocked guards

Question 11

What is being described below:

 Only provide a partial guarding
solution – still allows some access to
the dangerous parts
 Require regular inspection and maintenance

Answer 11

Advantages of self closing guards

Question 12

What is being described below:

 Have to leave part of the cutting tool
accessible for it to do its job
 May be set up to accommodate
largest job of a shift rather than
adjusted to best setting for each job.
 Can be removed and machine is still useable

Answer 12

Disadvantages adjustable guards

Question 13

Name a few ‘protection devices’

Answer 13

Two handed controls

Hold to Run Controls

Light Curtain

Question 14

There are a few types of ‘other’ guards.

Name a few.

Answer 14

Interlocked Guards

Self Closing Guards

Adjustable Guards