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Austinsevenfriends
4 speed Crash Gearbox Illustration - Printable Version

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4 speed Crash Gearbox Illustration - David Stepney - 09-04-2023

Some little while ago, someone (was it Tony Griffiths?) posted an illustration from one of the motoring magazines of a beautifully detailed cutout drawing of the 4 speed crash gearbox, but I am damned if I can find it. Can anyone point me in the right direction to find it please?

RE: 4 speed Crash Gearbox Illustration - Reckless Rat - 09-04-2023

Two images here, David:

[Image: IMG-20230111-WA0005.jpg]

and the inside of mine :

[Image: IMG-20230111-WA0004.jpg]

RE: 4 speed Crash Gearbox Illustration - Archivist - 09-04-2023

And a more formal engineering drawing on the Archive web site...

https://archive.a7ca.org/collections/technical-drawings/item/TD0149/?

RE: 4 speed Crash Gearbox Illustration - David Stepney - 09-04-2023

Thank you Bruce and Hugh, you are absolute stars!

RE: 4 speed Crash Gearbox Illustration - Hugh Barnes - 09-04-2023

Though I should point out that the Archivist has pointed you to the later, synchro box. The Archive does not hold a drawing of the crash box, sadly. He tells me he blames it on just having tested positive for Covid...

RE: 4 speed Crash Gearbox Illustration - David Stepney - 09-04-2023

I had noticed, Hugh. The Light Car and Cyclecar illustration tells me all that I was curious about. The third and fourth gearchanges are tighter than the first and second. I knew I ought to know the answer why, and that illustration has refreshed my memory: I am moving two sets of gears along two shafts.

RE: 4 speed Crash Gearbox Illustration - Chris KC - 09-04-2023

   

.jpg   DSC03014s.jpg (Size: 838.11 KB / Downloads: 329)

RE: 4 speed Crash Gearbox Illustration - Tony Griffiths - 09-04-2023

(09-04-2023, 10:17 AM)David Stepney Wrote: Some little while ago, someone (was it Tony Griffiths?) posted an illustration from one of the motoring magazines of a beautifully detailed cutout drawing of the 4 speed crash gearbox, but I am damned if I can find it. Can anyone point me in the right direction to find it please?

Yes, it was me. If you would like a high-resolution copy here it is: http://www.lathes.co.uk/austin7-2/img36.jpg
You can also sort through these 20 pages for more interesting illustrations: http://www.lathes.co.uk/austin7 with download instructions on the first page.

RE: 4 speed Crash Gearbox Illustration - Terrytuned - 09-04-2023

Technically it's only crash 1st and second 3rd and top are dog gears as on most motorcycle gear boxes. Terry

RE: 4 speed Crash Gearbox Illustration - David Stepney - 09-04-2023

Thank you Tony. I have kept a copy to go with my Austin 7 file.

And Thank you Terry. I was aware. However, one can still make horrid noises with it if one gets it wrong.