Paddleducks
Paddler Modelling => Paddlewheels/Drive Systems => Topic started by: Talisman on December 23, 2009, 05:10:31 AM
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Hi All,
A question that i have not fully answered myself so would appreciate some thoughts...
As most of us do not posses a lathe what do you all use as bearings on the hull (where the paddle shaft passes through the hull)
No right or wrong answers just interested to see how everyone does it.
Many thanks
Kim
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I just use a piece of brass tube - We aren't talking of huge speeds, so friction is minimal, and I've never had a problem with water seeping into the hull.
Regards
Eddy
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Excellent Eddy, that's the type of answer I'm after!
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How do you secure them Eddy?
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I just use araldite Kim - One further point, to ensure the two pieces are aligned perfectly I use a piece of brass rod right through the hull so they have to be in line!
If the rod is long enough it also makes it easy to sight down the length of the hull to check everything is straight, and also do the same from above to ensure you don't have one side slightly ahead of the other!
Regards
Eddy
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I used ballbearings on the Leviathan (similar to John Amos), which were fitted into a doldered housing at the hull. But hull is made from brass, so soldering no problem.
At PS DIESSEN with her brass hull too, I also soldered bigger brass rings for bearings to the hull. With a little hole for oiling them. The outer bearings autside the hull are brass, too on a frame in the wheelhouse.
Andreas
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I'm with Eddy on this one. I always think it's best to work on the 'KISS' principle (Keep It Simple Stupid!).
Seriously though a nice generous length of brass tube at the sort of loads and speeds we are talking about provides an almost perfect journal bearing.
Stuart
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That will do for me Stuart, saves me coming up with some over engineered (expensive) alternative.
And I learnt something along the way 'Journal bearing'
Don't you just love this site!
Thanks guys and if anybody else has anything I'd love to hear it.
Kim
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I would use the brass tube, but do it like a propeller shaft. With short sections nesting in the ends of longer ones, this would give you a bit of space for lubricant.
Regards,
Gerald.
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Hi All,
A question that i have not fully answered myself so would appreciate some thoughts...
As most of us do not posses a lathe what do you all use as bearings on the hull (where the paddle shaft passes through the hull)
No right or wrong answers just interested to see how everyone does it.
Many thanks
Kim
G'day Talisman.
One of our members in the Logan City Marine Modellers (we run on Tygum Lagoon at Waterford, South of Brisbane) made his shaft bearings out of a couple of large diameter bolts - drill through the centre, slide in the hull, fit the shaft and run up the nut. Nice job but needs a lathe.
I'm a bit lazy and I can't afford a lathe so I made mine out of 10mm thick chopping board stuff, screwed onto the hull sides. The PTFE is an ideal bearing material and is a lot tougher as a bearing surface than most might think. Besides, it can always be replaced with a couple of screws. Cheers.
ADAGIO (slow dancin' man).
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G'day Talisman.
One of our members in the Logan City Marine Modellers (we run on Tygum Lagoon at Waterford, South of Brisbane) made his shaft bearings out of a couple of large diameter bolts - drill through the centre, slide in the hull, fit the shaft and run up the nut. Nice job but needs a lathe.
What a brilliant idea, thanks very much for posting! Suppose i could use Eddy's epoxy idea to hold them which would save a bit of weight.
I'm a bit lazy and I can't afford a lathe so I made mine out of 10mm thick chopping board stuff, screwed onto the hull sides. The PTFE is an ideal bearing material and is a lot tougher as a bearing surface than most might think. Besides, it can always be replaced with a couple of screws. Cheers.
ADAGIO (slow dancin' man).
Another good idea. Easy to produce and cheap
A trip to Ikea & Screwfix on the cards ... :)
Thanks,
Kim
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Hi all,
I have had a paddle wheel kit in storage for some years, and the shaft bushings have a oiler tube soldered on, however I have never used the wheels.
I have been thinking about this recently, and as far as I can find out, the brass tube method seems the most popular, although small ball race bearings are available.
Noticed in an article (Model Boats - Glen Rosa) the builder used the brass inserts from Dyco universal couplings as shaft bushings
Clark
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Hi PD's.... a little late as usual :sorry ...here are a few .jpgs of the outboard bearing housings as manufactuted by our good colleague 'bogstandard' in 11/07....I have modified two :hammer....the installation is as previously note by others with a 5/32" dummy shaft being the critical alignment tool
They are to suit 1/2" OD x 5/32" ID SR3ZZ stainless shielded ball races..........PS Decoy is a retirement project.......Derek :beer
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Very nice Derek, that's the sort of thing i thought I'd have to come up with a design for.
People seem to be satisfied with just a simple arrangement which suits me even better :)
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How I make them.... http://www.paddleducks.co.uk/smf/index.php?topic=4771.30
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As members who look a my posts will know I have lots of rubbish. I use old sealed bearings from drills. Super glued to the shaft and held with a metal or wooden housing screwed to hull Geoff
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Hi PDs
I was re reading this thread as I'm trying out simple bearing ideas before I go near my hull!!! My shaft will be 5mm silver steel, so I tried 5mm bore universal coupling ends, but the shaft won't go through.
Then had a go with some 6mm brass tube, (5mm tube telescopes into this) shaft goes through fine, but with a bit of play, I think because the tube is thinwall.
Obviously the play is tiny, but not sure about using the tube because of this.
Thinking about trying to find some 6mm tube with a slightly thicker wall, but will still allow free rotation of the shaft....any ideas/suggestions anyone?
cheers
Clark
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One thing to beware of Clark, silver steel can rust, so it could seize up if the model is put into storage for a while!
Personally I'd change it to stainless steel, or brass for the shaft...
Regards
Eddy
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Thanks for that, Eddy, Good advice.
I had the silver steel (at least thats what its labelled) lying about, so have been experimenting with it.
I will try stainless or brass and see how the fit is inside the 6mm tubing.
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you can buy bronze/brass pre made bearings from some bearing retail out-lets , but i normally make my own on my lathe, i secure them in the hull sides w araldite , or i fit them into small prop tubes, but i have noticed some wear , as the paddle wheel is large compared to a prop, and intend to do the next set in bronze .
last one i did i basically turned up bearings same as a prop tube , and glued them into ply up-rights , no outer prop tube ,all mine are fitted w a oiling tube