Machine Safety: Guards and Protective Enclosures

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Questions and Answers

What is the minimum width of aperture required for a finger to pass through?

8 mm

15 mm (correct)

25 mm

20 mm

What is the minimum separation distance required to avoid pinching points for the wrist?

90 mm

100 mm (correct)

150 mm

120 mm

What is the maximum size of a polygonal opening that can be regarded as a round opening?

The distance between the two apexes that are the furthest apart

The area of the polygon

The perimeter of the polygon

The diameter of the largest circle that can be inscribed (correct)

What is the purpose of the operating manual provided with the machine?

To provide safety precautions during operation and servicing Signup and view all the answers

What is the minimum separation distance required to avoid pinching points for the arm?

120 mm Signup and view all the answers

What is the minimum width of aperture required for a hand to pass through?

40 mm Signup and view all the answers

What is the purpose of a protective device in a machine?

To ensure safety by maintaining a safe distance Signup and view all the answers

What is the minimum load that a guard should be able to withstand?

1,200 N Signup and view all the answers

What is the main consideration when designing a guard for a machine?

Strength and rigidity Signup and view all the answers

How should a guard be attached to a machine?

Permanently attached, but removable with common hand tools Signup and view all the answers

What should a guard be designed to allow for?

Easy operation and servicing Signup and view all the answers

Why should a guard have no sharp edges?

To prevent injuries Signup and view all the answers

What is the primary purpose of designing guards that can be opened?

To automatically stop the movement of dangerous parts Signup and view all the answers

What is the main consideration in designing the size of openings in guards?

The distance between the guard and the moving parts Signup and view all the answers

What is the purpose of a suitable warning notice on a guard?

To alert operators to potential hazards Signup and view all the answers

What is the purpose of ensuring a safety distance?

To reduce the risk of accidents Signup and view all the answers

What type of material can be used to form guards?

Welded or rigid mesh or grill Signup and view all the answers

What is the purpose of designing guards to prevent distortion?

To prevent the opening size and distance relationship from exceeding limits Signup and view all the answers

Why should supports be attached to a machine?

To avoid the risk of losing them Signup and view all the answers

What is the purpose of a jack on a non-stable machine or trailer with a drawbar?

To raise or lower the drawbar to facilitate operation Signup and view all the answers

Which of the following machines require a jack capable of raising or lowering the drawbar?

Trailers with an unladen mass exceeding 500 kg, and machines with a downward force exceeding 250 N Signup and view all the answers

How is the downward force acting through the drawbar measured?

With the machine stationary on horizontal ground and the drawbar at a height of 400 mm Signup and view all the answers

What is the primary concern related to the base of the jack?

It must be large enough to prevent sinking into soft ground Signup and view all the answers

How should the exhaust pipe outlet be directed?

Over or to the side of the operator's head level Signup and view all the answers

What is the purpose of protection for hot parts?

To minimize the possibility of inadvertent contact causing burns Signup and view all the answers

What is the requirement for the battery location?

Such that hazards to the operator due to fumes and electrolyte are minimized Signup and view all the answers

What is the requirement for the construction of guards?

They must meet the provisions covering construction Signup and view all the answers

How can the guard be detached?

Using tools Signup and view all the answers

Study Notes

Reach Dimensions and Openings

Rectangular openings must adhere to specific measurement standards; dimensions are given in millimeters for fingers and hands.
Polygonal openings must match requirements of round openings if the largest inscribed circle's diameter is the specified distance apart.
Other polygonal openings considered as slots, while inscribed circle diameter determines opening size.

Pinching Points

Dangerous pinching points are defined for body parts; maintaining minimum separation is crucial.
Minimum separation distances (in millimeters) for various body parts include:
- Finger: 25
- Hand, Wrist, Fist: 100
- Arm: 120
- Foot: 120
- Leg: 180
- Body: 500

Operating Manuals and Safety Information

Operating manuals must contain necessary safety precautions for agricultural machine operation and servicing.
Manuals should be detachable only with tools or permanently attached.

Exhaust and Safety Measures

Exhaust pipe outlet must direct harmful gases away from operators, ideally positioned above or to the side of the operator's head.
Safety measures must be in place to protect operators from hot parts and prevent burn risks during operation.

Battery Location Safety

Battery placement must minimize operator exposure to hazardous fumes and electrolyte risks.

Guard Construction and Safety

Guards must sustain a perpendicular static load of at least 1,200 N without damaging.
Guards designed for platforms and steps need to adhere to strength requirements.
Guards should be permanently attached but easily opened; must include safety mechanisms to stop dangerous movement when guards are opened.
Warning notices are required for guards with openings lacking securing devices.

Mesh and Grill Specifications

Guards may consist of welded mesh or grill; opening size depends on distance to moving parts.
Design must ensure guards can't be distorted in use to exceed allowed opening sizes.

Safety Distance and Machine Stability

Safety distances may substitute requirements when maintaining distance from dangerous parts.
Machines or trailers over specified weights need a secure jack to prevent drawbar collapse; measurement procedures for downward force must be conducted on level ground.

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Description

Test your knowledge of machine safety regulations and guidelines, focusing on guards and protective enclosures, including casing, fences, and rails, to ensure worker safety and prevent accidents.