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From bespoke machined leadscrews to standard bronze nuts, ABSSAC has had great success in the marine industry. We can supply a range of products in Stainless Steel including shaft couplings and universal joints. Other applications have included engine throttle control as well as various submariner challenges.
Although ABSSAC has had great success in the marine industry with its Stainless Steel POWERSCREW ranges of lead screws and nuts, an innovative design of shaft clamp is delivering key benefits in a range of power transmission applications, not least in the highly challenging marine environment.
The new product is delivering a new paradigm in torque transmission capability, reliability and ease of maintenance marine power transmission systems make stringent demands on shafts and clamping components. Not only must they deliver high torque capacity, but they must also offer high levels of reliability combined with ease of maintenance. Marine power transmission systems can require frequent disassembly for maintenance, so quick mounting of dismounting is an essential feature. Then there is the challenging marine environment and the fact that there is often very little space in which to work.
As yachts increase in size, outboard propulsion systems quickly become inappropriate, whilst on the very largest yachts and highest powered craft exotic propulsion systems such as water jets are becoming fashionable. But for yachts between 40 and 100 feet in length, from luxury yachts right up to the so-called super yachts, by far the most common propulsion arrangement where speeds above 40 knots are not required is the in-board drive with conventional submerged propellers. All propulsion systems have their advantages and disadvantages, but in-board drive lines benefit from an inherent simplicity and, when properly maintained, a near unlimited life. The emphasis on maintenance is crucial. The underwater appendages are subject to shock and there will always be inherent vibration.
Excessive vibration would likely indicate serious wear due to misalignment, but there is inherent misalignment in all in-board propulsion systems: the engine is installed on rubber mounts and the shaft is mounted in rubber bearings, so both engine and shaft can move. In addition, the boat hull itself is not completely rigid so there is more potential for movement.