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Speedometer issue, needle doesn't move.
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nbuscemi
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PostPosted: Fri May 27, 2016 11:30 am    Post subject: Speedometer issue, needle doesn't move. Reply with quote

I removed my noisey speedo from my 1968 Bug. Tore it down, cleaned and greased everything inside (worm gears). I reassembled it ever so lovingly only to have the needle not move. I attached a speedo cable to a drill and spun it... Odometer works just fine, but no movement from the needle. I can rotate the needle by hand and moves freely, no binding. Any ideas? I seems like the rotating magnet isn't close enough to the cup, but I couldn't see any adjustments for it. Please Help!!!

-Nick-
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nbuscemi
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PostPosted: Sat May 28, 2016 9:20 am    Post subject: Re: Speedometer issue, needle doesn't move. Reply with quote

I've taken the speedo apart a few more times trying to figure out what i did wrong. After many attempts, still no needle movement. Even after much research into the matter I can't figure out how a magnet is able to move an aluminum cup. Doesn't make an ounce of sense.

-Nick-
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SBD
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PostPosted: Sat May 28, 2016 10:52 am    Post subject: Re: Speedometer issue, needle doesn't move. Reply with quote

I think there should be a magnet on the cup too.
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nbuscemi
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PostPosted: Sun May 29, 2016 6:13 am    Post subject: Re: Speedometer issue, needle doesn't move. Reply with quote

I figured out my issue.... Some how my need ended up on the wrong side of the needle stop causing the clock spring to be way too tight. After fixing that, everything works as it should.

-Nick-
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rsthj
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PostPosted: Mon May 30, 2016 12:00 pm    Post subject: Re: Speedometer issue, needle doesn't move. Reply with quote

nbuscemi wrote:
I've taken the speedo apart a few more times trying to figure out what i did wrong. After many attempts, still no needle movement. Even after much research into the matter I can't figure out how a magnet is able to move an aluminum cup. Doesn't make an ounce of sense.

-Nick-


You've already solved the problem but the magnet influences the aluminum cup through eddy currents: https://www.youtube.com/watch?v=5BeFoz3Ypo4&spfreload=10
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