David Jones' historic gearbox problems

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Hugo
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#1 David Jones' historic gearbox problems

Post by Hugo » Mon Jan 22, 2018 2:32 pm

I just got an e-mail from Paul Canglisosi (or whatever his name is) in Florida, promoting a video of his entitled 'Learn about ball bearings..'
I thought I'd watch it on the off chance I might learn something. And I did - I found it most interesting;



And that got me thinking about Mr Jones' 5 speed gearbox, which, if I recall correctly, had a tendency to push the circlip (snap ring) off the back of the main-shaft.
One of the things Paul mentioned in his video is the chamfer on the inner race of most ball bearings, and he explained how, if the bearing was up against a circlip, you needed to either use a bearing with a square inner edge (i.e. no chamfer or radius), or fit a re-inforcing washer, otherwise the bearing could push the circlip out of its groove under hard axial load. Obvious when you think about it, but I'm not sure I'd have spotted it.
I was wondering - was that ever considered as a source of your circlip failure David?
Hugo Miller - rebuilding an imported Series II OTS & converting to RHD

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MarekH
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#2 Re: David Jones' historic gearbox problems

Post by MarekH » Mon Jan 22, 2018 4:39 pm

I think you mean "historical" not "historic".

Whilst it may have been an event worthy of entering the history books, I doubt it ever did.

kind regards
Marek

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#3 Re: David Jones' historic gearbox problems

Post by Heuer » Mon Jan 22, 2018 4:43 pm

Yes, that was the problem along with flawed design. They cut a deeper groove but it failed again so on the final iteration the TIG welded it in place. Not ideal for future maintenance work but at least it should not fail!
David Jones
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#4 Re: David Jones' historic gearbox problems

Post by Hugo » Mon Jan 22, 2018 5:01 pm

MarekH wrote:
Mon Jan 22, 2018 4:39 pm
I think you mean "historical" not "historic".

Whilst it may have been an event worthy of entering the history books, I doubt it ever did.

kind regards
Marek
Hey - I'm the pedant round here ;)
Hugo Miller - rebuilding an imported Series II OTS & converting to RHD

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#5 Re: David Jones' historic gearbox problems

Post by MarekH » Mon Jan 22, 2018 10:18 pm

Not to worry; when people say I'm articulate, I think they mean "like a lorry".

kind regards
Marek

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