Machine Guarding

What are the two types of primary safeguarding methods?

Guards and devices

What do guards do?

Guards place a physical barrier between the worker and the machine

4. Select the two words that complete these sentences: ____________ are how the machine part moves, for example rotating, in-running nip points, reciprocating, and transversing. ________________ are operations the machine performs, such as cutting, punching, shearing, and bending. Select all that apply. a. Movements b. Motions c. Actions d. Operations

B,C

How must abrasive wheel machinery be guarded?

On abrasive wheel machinery, there must be an adjustable tongue guard to within ¼" of the wheel, a work rest with a maximum opening of ⅛ of an inch, and a cover spindle end, nut, flange projections.

How must revolving barrels, containers and drums be guarded?

Revolving barrels, containers, and drums must be guarded by an enclosure interlocked with the drive mechanism, so the barrel, gun, or container cannot revolve unless the guard enclosure is in place.

When must power transmission apparatus be guarded?

When he shafting, flywheels, pulleys, belts, chain drives, etc. of power transmission apparatus less than 7 feet from the floor or working platform must be guarded.

When must fan blades be guarded?

When the periphery of the blades of a fan is less than seven (7) feet above the floor or working level, the blades must be guarded. The guard must not have openings larger than one-half (½) inch.

What are the four types of guards?

fixed, interlocked, adjustable, and self-adjusting

Components of the power transmission

flywheels, pulleys, belts, connecting rods, couplings, cams, spindles, chains, cranks, and gears.

What are the six types of devices?

presence-sensing, pullback, restraint, safety trip controls, two-hand controls, and gates.

2. Which parts of a machine must be guarded? Select all that apply. a. Fan Blades b. Abrasive Wheel Machinery c. Revolving Barrels, Containers, and Drums d. Power Transmission Apparatus

A,B,C,D

What kind of machines require guarding?

• Guillotine cutters • Guillotine cutters • Shears • Alligator shears • Power presses • Milling machines • Power saws • Jointers • Portable power tools • Forming rolls and calendars Anytime you are working on a machine where the point of operation exposes you to injury, it must be guarded.

Most accidents occur during:

• Operating unguarded or inadequately safeguarded machinery • Materials handling, including during use of forklifts, compactors, powered and non-powered hand tools • During activities involving stationary machines

Common hazards include:

• Reaching into 'clear' equipment • Not using lockout/tagout • Fixing machines • Lack of machine guards

All machines consist of three fundamental areas:

1.the point of operation, 2. the power transmission device, and 3. the operating controls.

1. What are the most common ways workers get hurt around machines? Select all that apply. a. Reaching-in to clean equipment b. Using guards c. Not using lockout tagout d. Missing guards e. Unqualified operators

A,C,D,E

3. All that matters is that guards are used. Even those that don't meet all requirements are better than nothing. Is this true or false? a. True b. False

B

Operating Controls

The operating controls are the mechanical or electric power controls used by the worker to operate the machine.

Point of Operation

The point of operation is where work is performed on materials. Examples include cutting, shaping, boring, and forming of stock.

What are the most common injuries for when using machinery?

amputations, especially those of the fingers

Power Transmission

are all components of the mechanical system which transmit energy to the part of the machine performing the work.

What do devices do?

devices either prevent or detect operator contact with the machine's point of operation or stops hazardous motion if a worker's body part comes too close to a moving machine part.