Mr Whippy
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| posted on 24/12/25 at 09:35 AM |
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Advice on making a propshaft
Hi,
Right first thing this is not for a car and has been a problem not resolved for about 2 years now (other projects got in the way). In fact this is for
a model ship. The issue is the shear length of the shafts (2 off) their 117cm long! much much longer than anything commercially available. I've
tried various things nothing worked at all. Basically I just need two steel shafts with a M5 thread on the end and four sintered bronze bearings per
shaft that are a good sliding fit over the whole shaft length. Sounds simple?
However, I cannot find anyone who can supply these and I don't possess any equipment capable of doing this myself. Below is a screenshot of this
section, the orange shafts shown. There's a lot of talented machinists on here I'm hoping would be able to suggest a way forward. Thanks
Yeah on the real ship they were crazy long too.
[Edited on 24/12/25 by Mr Whippy]
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adithorp
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| posted on 24/12/25 at 02:52 PM |
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What have you tried?
Quick goggle found 5mm round stainless round bar from metals4u is £7 for 2m length. Cut to length and tread the ends.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Mr Whippy
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| posted on 24/12/25 at 05:20 PM |
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quote:
Originally posted by adithorp
What have you tried?
Quick goggle found 5mm round stainless round bar from metals4u is £7 for 2m length. Cut to length and tread the ends.
How did you specify the thread cutting, I don't see any option on their site for that or have come across a supplier that did offer it?
I ordered some Silver Steel but found the diameter varied along the length so much so the bearings I had rattled or jammed (ball bearings), I also
tried a carbon rod but it also was not consistent diameter, it also had a bend in it. Got in touch with a guy who made model propshafts but he wanted
£170 per shaft!
I have found websites that sell the sintered bearings, that's easy and I don't need the normal brass tube as most do due to there being a
sealed "chamber" around the shaft for oil. The bit I was struggling with was the bearings tbh and getting a good fit along the whole length
(but not too tight as to get hot).
Thanks.
[Edited on 24/12/25 by Mr Whippy]
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adithorp
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| posted on 25/12/25 at 11:33 PM |
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I assumed someone on a car building forum was capable of using a tap+die set.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Schrodinger
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| posted on 26/12/25 at 08:58 AM |
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is there any reason not to have a two part shaft?
Keith
Aviemore
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PAULD
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| posted on 26/12/25 at 09:52 AM |
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I've just picked this up. I'll u2u my phone number, if you still need help call me.
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gremlin1234
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| posted on 26/12/25 at 11:42 AM |
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will some of the threaded parts need to be 'left hand thread' ?
edit:
the propellers in the diagram suggest so...
[Edited on 26/12/25 by gremlin1234]
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