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Smiths mechanical govenor speedometers

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Smiths mechanical govenor speedometers
Alan Offline
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Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#11
28-01-2019, 06:27 PM
Yes I’ve spoken with him too. His advice was they can’t be recalibrated. I suspect he meant “I can’t do it”
Alan Fairless
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Charles P Offline
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#12
28-01-2019, 06:43 PM
The much missed Alan Raeburn used to.

C
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Alan Offline
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Car type: Race Ulster, 1926 Special, 1927 Chummy, 1930 Box
#13
28-01-2019, 07:41 PM
It can only be a question of the governor spring and odometer drive gearing. Parts availability might be a problem.
Alan Fairless
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"Slack Alice" Simon Offline
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#14
28-01-2019, 10:14 PM
My Dad made an early cruise control system for his Morris Minor, in the early 1960's.

That used the governor from a speedo, driven through a home made gearbox using nylon gears from the model making world.

Which if I ever get round to it, I would use to do mine properly.   But the numbers on the odometer are all rusty, so I probably will never bother!
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Mark McKibbin Offline
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Location: Rokeby, Victoria, Australia
Car type: '27 Chummy, '34 Special, '50 Traction Avant
#15
29-01-2019, 01:10 AM
(28-01-2019, 06:27 PM)Alan Wrote: Yes I’ve spoken with him too. His advice was they can’t be recalibrated. I suspect he meant “I can’t do it”

I think it is very much a trial and error procedure with lots of assembling and disassembling also maybe the weight could be varied but It would be best to gut a "TN" or an "N" which are freely available and I an pretty sure run around the same TPM and the odometer would then be accurate as well.
Cheers

Mark
http://www.carcrank.org
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mopetta Offline
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#16
29-01-2019, 11:17 AM
I have 100miles speedos in both of my seven. One works quite ok - the other didn't move at all. The non-working had a very heavy spring, so I fitted a spring with the same dimensions as I had in my working speedo. It's better now, but not really linear. Looks like the used many different setups (weight, spring, etc.).

Oliver
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