Millwright (433A) — Red Seal

Performs common occupational skills

Before working from an elevated platform at a height that requires fall protection, which value must a millwright confirm under the rules that apply?

1. The maximum working reach of the longest portable ladder available in the shop today
2. The rated load capacity stamped on the platform decal, mistaken for the fall-protection trigger height
3. The fall-protection threshold height set in their own provincial occupational safety regulation
4. The forecast wind speed, used as the height at which fall protection becomes required

A common threshold is about 3 m (10 ft), but several provinces set the trigger lower, such as 1.8 m (6 ft), so the worker must confirm the threshold in their own provincial regulation before working at that elevated height. Ladder reach tells the millwright how far a ladder extends, not the legal point where fall protection becomes mandatory. The platform load capacity decal limits the weight on the platform, a separate concern from fall distance. The forecast wind speed may affect whether work proceeds, but it does not define the regulated value that triggers fall-arrest requirements.

RSOS 2017 | A-1.02 Maintains safe worksite

Performs rigging, hoisting/lifting and moving

A millwright must move a heavy pump skid a short distance across a level shop floor. Which moving method is most appropriate when no crane is available?

1. Drag the skid across the bare floor with a chain hooked to the nearest available forklift
2. Lift one end with a personal effort while a helper kicks blocks underneath the moving skid
3. Tip the skid onto one edge and walk it forward corner by corner across the open floor
4. Slide the skid on machinery rollers or skates with a pry bar and steady controlled pushes

Machinery rollers or skates with a pry bar and steady controlled pushes move a heavy skid safely on a level floor because the rollers carry the weight while the millwright controls direction. Dragging the skid with a chain to a forklift can jerk the load, gouge the floor, and overload the forklift in an unsafe sideways pull. Lifting one end by personal effort while a helper kicks blocks under it puts hands and feet in a crush zone. Walking the skid on one edge corner by corner risks tipping a tall, heavy load onto the very workers guiding it.

RSOS 2017 | B-7.03 Selects hoisting/lifting and moving equipment

Services mechanical power transmission components and systems

A vertical shaft rests its full weight downward onto its support. Which bearing type is intended to carry that purely axial duty?

1. A thrust bearing, which carries axial (thrust) loads only along the shaft
2. A cylindrical roller bearing intended for heavy radial load across the shaft instead
3. A deep groove ball bearing intended mainly for radial duty with light end load
4. A self-aligning bearing intended to absorb shaft misalignment rather than end load

A thrust bearing is intended to carry axial (thrust) loads only, which suits a vertical shaft pressing its weight straight down onto the support. A cylindrical roller bearing is built for heavy radial load across the shaft and takes essentially no end load, so it cannot support a downward axial weight. A deep groove ball bearing handles mainly radial duty with only light thrust. A self-aligning bearing is meant to absorb angular misalignment, not to carry pure end load, so the thrust bearing is the type matched to the vertical shaft's axial duty.

RSOS 2017 | C-10.01 Installs shafts, bearings and seals