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propshaft bearings

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George Malcolm Griffett20/08/2009 23:08:10
12 forum posts
Continuing the rebuild of my vintage model I have now discovered that the propshaft bearings are to worn to be used. The coupling end has a small roller bearing and the prop end is bronze or similar, the problem is how to replace them or remove the tube altogether which is 20" long with a 3/16" shaft. In such an old model well made in wood with such a long tube well glued and fitted, it may cause to much damage to attempt removal. Any ideas?
ashley needham21/08/2009 07:04:46
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7593 forum posts
167 photos
Geoff, Difficult. Heat may loosen the bearings in the tube sufficiently to pull them out, could try a self-tapper screw in the bearings and pliers? or drill the bearings out, or grind them out using a dremmel or similar? if the tube was cut off either end could a smaller tube be inserted in the shell of the existing?   Ashley
Bob Abell21/08/2009 09:20:21
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9337 forum posts
2985 photos
I would try using a 3/16" rod and longer than the prop tube........turned down at one end to about 1/16"......so that you have a good shoulder.
 
Slide the shaft up the tube and catch the bearing with the shoulder....and tap it out!
 
Bob....................Eng (retired)
George Malcolm Griffett21/08/2009 13:47:15
12 forum posts

My thanks to both Ashley and Bob for your suggestions and success!  I removed both bearings with Bobs idea, which if anyone else has a similar problem works very well. I used the old prop shaft and turned down the end on my lathe which was then just long enough to work. All I have to do now is find where I can get replacement bearings?
Cheers Malcolm.
 
Ian Gardner21/08/2009 14:13:44
566 forum posts
1 photos
Hi,
If you have a lathe why not turn them on that? You could get a length of phosphor bronze from a supplier.
I found that using a D bit makes a nice close fit rather than drilling the whole diameter. Making a D bit is described in 'Using the Small Lathe' by LC Mason which was an MAP publication. You require a piece of silver steel  the same diameter as the shaft . While your'e at it you could make a new shaft as well.
Just a few suggestions. Have fun.
Ian Gardner
Phil Abbott21/08/2009 16:12:36
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22 forum posts
4 photos
Rather than a "D" bit I would ream the hole, nice fit then, as Ian has said turning up a couple of bearings would be the way to go, at least you know they will fit the tube.
Phil
Bob Abell21/08/2009 18:55:03
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9337 forum posts
2985 photos
Hello George
 
If you are goung to remake the prop shafts..............I recomend you change to 5mm...............Imperial sizes are very expensive these days
 
Just a thought....................Bob
George Malcolm Griffett21/08/2009 20:38:05
12 forum posts

Thanks to you all for your help and advise, I  shall have a go at machining one myself for the prop end in bronze but the coupling end has to be a roller bearing because of the end fitting on the shaft.
Bob you may have a point as I tried to find a supplier this afternoon for this roller bearing, having quoted the number,  it appears to be a now very rare size but did find one in germany for £14-50 plus postage & tax, so your suggestion to alter to metric and go to 5mm may be the best option.
I also like the idea of having a go at making the new shaft myself and will give it a try.
When I have put these ideas into practise I will post and give results
 
Malcolm.
Bob Abell21/08/2009 21:03:45
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9337 forum posts
2985 photos
Hello George
 
Still don`t think you need a roller bearing at all.........Make a brass one the same size as the roller and simply fit that!
 
Bob
George Malcolm Griffett21/08/2009 22:31:00
12 forum posts
I must admit you got a good  point there Bob   Hmmmmmm................
 
see if I can find a piece of bronze big enough!
 
Malcolm.

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