Paddleducks
Paddler Information => Preserved Paddle Ships => Topic started by: Eddy Matthews on July 02, 2008, 03:16:06 PM
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As some will know, Waverley suffered a problem with its paddleshaft that required the ship to have the paddlewheel/shaft removed and sent to a specialist company in Manchester to have the shaft reground.
The good news is that the wheel/shaft were returned to Scotland on saturday June 28th. It's hoped that Waverley will leave drydock later today (wednesday July 2nd), and make her first sailing on thursday 3rd July.
See http://www.waverleyandbalmoral.co.uk/waverley/articles08/wheel/index.htm for more info.
Regards
Eddy
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Hi PD's & thanks Eddy.........in a previous Waverley docking :hammer snaps from years ago, she appeared to have outboard shaft split slipper bearings [white metal/bronze/leaded bronze???]...so if the shaft required a regrind would suggest reclamation welding & new bearings due to a fault in the bearing lube system??????
The WEB site naturally does not talk about this ....but some of our knowledgeable Waverley ....PD members :gathering may offer additional comments .... :beer - Derek
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Derek.
I've just downloaded that same photo you have of WAVERLEY's paddle wheel.
I went onto the "Clyde River Steamer Club" site then onto "Other Links" on that site, and got the Waverley photos of her mishap on James Crae photos and a very interesting selection it is too.
By the looks of the photo I would say that heat has been applied to the hub of the paddle shaft, possibly an attempt to withdraw the shaft from the hub and not successful hence the shaft and wheel going away together.
In cases like that, we used to drill away the gib key before withdrawl! Sandy
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Hi PD's....here is some text from the April 2000 Waverley refit & the .jpg is the port wheel shaft lower bearing block being machined........& the text in MAROON is suprising
"The first cut is taken, removing 1mm of material, a final 0.5 mm cut is all that is required to clean up the housing in preparation for a new bottom bearing to be cast and machined to suit. The shaft sits on a bottom bearing only with merely a top cover with tallow box covering the top half of the shaft".
:nono......& a brillant & easy way to get distortion or ovality in any bearing journal is to machine a 1/2 component only .... :shoot...not even in OZ would this be allowed ...God rest you merry gentleman......
Anyway...the news as offered by Sandy was that the actual paddle hub to shaft interface was the area of concern......what sort of clearance would the two components have at manufacture??????
0.00025" per inch...so a 12" shaft would equal less than 0.003" total????????..or is that TOO greater clearance
Sandy also mentions withdrawal of the gib head key...I have searched for but cannot locate any .jpg's of spigoted & bolted hub to shaft retainers.... :hammer
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Just a view of the Waverley model paddle shaft bearing which may be of interest. Scale 1:8
Robert
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I notice that it appears to be grease box type of assembly and that the shaft come out of this and goes though the side of the hull.
My shaft goes through a phosphor bronze bearing in the side of the hull. How would I stop water ingress please ?
Ken
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Hi Robert,
could you give us more pictures of details and of the whole model of this ship?
Andy
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Andy,
I shall take some more recent photos of the engine and part of the hull and send them to you. The engine is a full working triple expansion with cylinder diameters of 75mm, 122mm, 190mm and a stoke of 210mm. At the moment I will post a photo of the paddle sponson under construction.
Robert
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Hi PD's.....& Ken asks.... my shaft goes through a phosphor bronze bearing in the side of the hull. How would I stop water ingress please ?
Transferred to http://www.paddleducks.co.uk/smf/index.php?board=6.0.....& Lubrication of Stern Tubes....Derek
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Hi PD's.......Sandy quoted....
"In cases like that, we used to drill away the gib key before withdrawl!"
This morning Walter provided some additional references that I had missed.... :breakcomp...and a :kewlpics of Waverleys paddle shaft with the parallel keyway that Sandy mentioned....or could there be two keyways @ 90 degrees?
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Hey PD's,
Derek asks....or could there be two keyways @ 90 degrees?
The caption above the cited picture confirms that 2 keys were used in aligning the paddlewheel's hub. So now the question is; Were the paddlewheels indexed? perhaps so that the buckets on both sides of the ship entered the water simutaneously, thus avoiding stressing one side of the vessel then the other? Or were two keys simply redundancy, thus assuring that the a single key would never shear? Enquiring minds need to know!
Randy
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Derek
Have you seen this one of the lock nut?
I can just see myself swinging a big mel on this! Sandy