From Nook Industries, Inc.
Isleburn Mackay & Macleod Ltd. designs and fabricates systems and components for large marine-based structures. Recently, the firm won a contract to design and manufacture a movable, covered, pedestrian walkway at the Aberdeen Ferry Terminal in Aberdeen, Scotland. Northlink Ferry Company operates a daily ferry, which transports passengers and automobiles back and forth between Aberdeen and the Shetland Islands, and needed an adjustable pedestrian bridge that could be raised and lowered to connect with ferries at different tidal levels and provide passengers with a safe, enclosed means for boarding and disembarking ships. According to Stuart Kydd, Project and Systems Manager at Isleburn Mackay & Macleod, the Aberdeen Ferry Terminal walkway project was particularly challenging because of the dramatic range in ocean tides that are possible at Aberdeen, the heavy loads involved, and more stringent safety requirements. "The tide differential at Aberdeen - the difference between high and low tide - can be as much as 20 feet," Kydd explains. "The walkway design not only had to address this wide tidal range but also had to support loads of up to 50 tons. Safety regulations governing the design of ferries and terminals have also increased dramatically in recent years. Our design had to be safe, strong, and highly movable."
Products & Services
Precision locknuts are used to secure bearings, gears, and other power transmission products to shafts and spindles.
Lead Screws and ACME Screws
Lead screws and ACME screws are used to drive a nut in linear motion via direct contact between the screw and the nut. Lead screws usually incorporate proprietary screw and nut geometries and materials, and can be configured in zero-backlash arrangements.
Roller screws convert rotary to precise linear motion in a similar manner to ball screws or lead screws. Due to the greater number of contact points of the rollers compared to balls or thread on thread contact, a roller screw provides higher stiffness and smooth motion.
Ball screws convert rotary motion to linear motion, or torque to thrust, and vice versa. They are primarily a power screw with a train of ball bearings riding between the screw and the nut in a recirculating track.
Topics of Interest
38.1 DESCRIPTION OF FERRIES
The role of a ferry is the routine and continuous transport of people, their associated baggage, vehicles and trains. This is a...
37.1 PASSENGER SHIP DESCRIPTION
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Emergency / parking brakes for hosting winch drives on a ro-ro catamaran ferry bridge.
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THE REPORTED STORY
The New York Times Abstract:
The death toll rose to 111 in the Hyatt Regency Hotel accident today, as officials began trying to determine what caused the collapse of two...