Tenth prop shaft bracket line bore for frigates
A
Metalock Engineering product story
Edited by the Engineeringtalk editorial team
Feb 2, 2001
Using two line boring set-ups to machine inboard and outboard propeller shaft 'A' bearing brackets simultaneously, Metalock Industrial Services has speeded up the procedure for Type 23 frigates
Using two line boring set-ups to machine inboard and outboard propeller shaft 'A' bearing brackets simultaneously, Metalock Industrial Services has speeded up the procedure dramatically for Type 23 frigates at the Scotstoun shipyard for BAe Systems Marine.
Since introducing this procedure Metalock has line bored brackets on five of the twin-screw frigates and two vessels for the Malaysian navy.
A predetermined datum is provided by the customer in the form of a taut piano wire from the centre of the engine drive shaft out through to the main 'A' bracket bore centre.
The intermediate bracket (inboard) is about 12 metres from the stern gland seal and the larger main bracket (outboard), 20 metres.
Using that datum, Metalock set up their two line boring machines enabling both bores to be machined at the same time.
In the new forged/fabricated 'A' brackets there is 50mm of green material to be removed from each bore and 40mm from each end face to give a length of 832mm for the intermediate bracket and 1658mm for the main.
Finished bores are stepped to ease fitting of the bushes which are pulled into place.
The intermediate has one step from 685mm to 686.5mm and the main has two steps from 685mm though 686.5mm to 688mm diameter.
Support brackets to accept Metalock's boring bar assemblied are welded to the 'A' brackets.
Four sets accommodate drive and support facilities to machine two brackets at a time and on completion of the procedure on one side of the vessel, assemblies are moved to the remaining pair of 'A' brackets.
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