The following warnings occurred:
Warning [2] Undefined variable $search_thread - Line: 60 - File: showthread.php(1617) : eval()'d code PHP 8.1.31 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/showthread.php(1617) : eval()'d code 60 errorHandler->error_callback
/showthread.php 1617 eval



Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
4 speed Crash Gearbox Illustration

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Threaded Mode
4 speed Crash Gearbox Illustration
David Stepney Offline
Cantankerous Welsh Hermit
*****
Joined: Jan 2019 Posts: 1,567 Threads: 20
Reputation: 14
Location: Bala North Wales
Car type: 1933 RP Standard Saloon
#1
09-04-2023, 10:17 AM
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?
Reply
Reckless Rat Offline
Resident Frog
*****
Joined: Aug 2017 Posts: 2,400 Threads: 33
Reputation: 36
Location: Deepest Frogland 30960
Car type: 1933 RP Standard Saloon
#2
09-04-2023, 10:28 AM
Two images here, David:

[Image: IMG-20230111-WA0005.jpg]

and the inside of mine :

[Image: IMG-20230111-WA0004.jpg]
Reply
Archivist Offline
Senior Member
****
Joined: Dec 2019 Posts: 302 Threads: 83
Reputation: 3
#3
09-04-2023, 10:33 AM
And a more formal engineering drawing on the Archive web site...

https://archive.a7ca.org/collections/tec...em/TD0149/?
https://archive.a7ca.org/
Reply
David Stepney Offline
Cantankerous Welsh Hermit
*****
Joined: Jan 2019 Posts: 1,567 Threads: 20
Reputation: 14
Location: Bala North Wales
Car type: 1933 RP Standard Saloon
#4
09-04-2023, 10:41 AM
Thank you Bruce and Hugh, you are absolute stars!
Reply
Hugh Barnes Offline
Still learning...
*****
Joined: Aug 2017 Posts: 1,193 Threads: 71
Reputation: 8
#5
09-04-2023, 10:52 AM
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...
Reply
David Stepney Offline
Cantankerous Welsh Hermit
*****
Joined: Jan 2019 Posts: 1,567 Threads: 20
Reputation: 14
Location: Bala North Wales
Car type: 1933 RP Standard Saloon
#6
09-04-2023, 11:02 AM
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.
Reply
Chris KC Offline
GO 6285
*****
Joined: Aug 2017 Posts: 3,394 Threads: 106
Reputation: 28
Location: Darkest Bedfordshire
#7
09-04-2023, 02:16 PM
   

.jpg   DSC03014s.jpg (Size: 838.11 KB / Downloads: 330)
Reply
Tony Griffiths Offline
First Grey Mag editor
*****
Joined: May 2018 Posts: 2,954 Threads: 558
Reputation: 20
Location: Peak District, Derbyshire
Car type: 1929 Chummy, 1930 Chummy, 1930 Ulster Replica, 1934 Ruby
#8
09-04-2023, 03:24 PM
(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.
http://lathes.co.uk
Reply
Terrytuned Offline
Senior Member
****
Joined: Aug 2017 Posts: 327 Threads: 1
Reputation: 19
Location: Bristol
#9
09-04-2023, 03:43 PM
Technically it's only crash 1st and second 3rd and top are dog gears as on most motorcycle gear boxes. Terry
Reply
David Stepney Offline
Cantankerous Welsh Hermit
*****
Joined: Jan 2019 Posts: 1,567 Threads: 20
Reputation: 14
Location: Bala North Wales
Car type: 1933 RP Standard Saloon
#10
09-04-2023, 07:08 PM
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.
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)