Stainless steel and aluminium sleeves
The Jefa rudder sleeves are used in two applications:
- To provide a high tolerance bearing surface for carbon rudder stocks. Roller bearings can’t run directly on the carbon surface of a carbon rudderstock as the surface isn’t accurate and hard enough. By bonding the sleeve with epoxy around the carbon rudderstock, a very precise outer surface is created, also ideal as running surface for lip-seals.
- When converting conventional plain bearings to roller bearings. As a rudderstock produced for gliding bearings doesn’t have the appropriate tolerance and the surface will have been worn by the gliding bearing one has to use sleeves over the shaft to create a proper surface again. Please read more on this subject on our conversion section.
The Jefa rudder sleeves are made from tubular bar machined at the in- and outside. The inside is machined to a “gun barrel” shape for the best bonding to the rudder shaft. The outside is machined to a tolerance of +0.00 -0.05 mm. The Jefa sleeves are made to suit the specific requirement in stainless steel 316 and anodised aluminium with a wall thickness is 3 to 3.5 mm. Specific prices can be found on our pricing page. Please click on the pictures for a larger view.
Installation on metal rudder stocks
Make the shaft a bit rough with a angle grinder, where the sleeve shall be mounted. Before you put glue on the shaft, first dry run the sleeve over the shaft, making sure it fits. As the room between the shaft and the sleeve is only a couple of tenths of a millimeter one should use a thin epoxy resin (for example Araldit, available in every marine shop). Clean the shaft and inside of the sleeve. Put the epoxy resin around the shaft and inside of the sleeve and slide the sleeve over the shaft while rotating. Remove all obsolete resin with a cloth and a dissolvent. Seal the top and bottom with Sikaflex 221 so no water can run between the shaft and sleeve.
Various black anodised aluminium 6062 sleeves
Specification of sleeves for carbon fibre rudders
Hard anodised (20 microns) black anodised aluminium 6082 sleeve
Example of a carbon rudder system
Glue for sleeves
To connect stainless and aluminium sleeves to the metal rudder stock we advise to use epoxy glue like the below shown Araldite which is available at Jefa.