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Author Topic: Davis Anemometer Issue  (Read 507 times)

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Offline carolinarider

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Davis Anemometer Issue
« on: January 10, 2019, 02:46:31 PM »
Davis Vantage Pro 2 about six years old.

I have been working with my weather station to make it more productive for me.  One of the issues I have had for some time is the wind speed measurements are erratic.  So, I went out yesterday to try and figure out the problem. 

Wind direction works fine, however the windspeed cups don't freely spin when they should.  I thought maybe there was something I failed to do in initially insulation (maybe a locking tab or something and yes I know its been awhile but......).  So, I pulled down on the cups and heard a click. 

After that I got windspeed information for a few minutes and then it stopped.  So I pushed up on the cups and got windspeed information.  After a few minutes the cups stopped spinning.  I played with them again and the moved freely for a few minutes and then sort of locked up again.

My question is, it would seem there is some binding going on in the bearings.  Is it possible to lubricate the bearings with an external spray. 

Are there other things I can do to free up the wind cup assembly?

Update:  Well I just looked at the Davis Instruments web page and found this information which I should have looked for before.

Use the Allen wrench provided to tighten the set screw on the side of the wind cups. When you let go of the wind cups, they should drop slightly.

Spin the wind cups. If they do not spin freely, loosen the set screw and lower the cups slightly. Repeat until the wind cups spin freely.

NOTE: DO NOT attempt to lubricate the wind cup shaft and bearings or the wind vane shaft. Natural or synthetic lubricants affect the normal operation of the anemometer by reducing the componentsí efficiency. They may also attract insects which can interfere with moving parts.

I shall now go out and try the above and report back.
« Last Edit: January 10, 2019, 02:50:46 PM by carolinarider »

Offline 4wd

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Re: Davis Anemometer Issue
« Reply #1 on: January 10, 2019, 08:13:23 PM »
I've changed the bearings on mine when it started sticking until the wind was stronger.
The set is/was available on ebay and fitting was not difficult.
( https://www.ebay.co.uk/itm/Davis-Weather-Station-Anemometer-Bearing-Service-Kit/172579873167?hash=item282e8fe18 )
The old bearings were definitely rusty even though the anemometer was replaced about three year before.
I don't see you have much to lose by disassembling and lubricating.
You won't get lubricant where needed without taking it apart.

Offline carolinarider

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Re: Davis Anemometer Issue
« Reply #2 on: January 10, 2019, 09:31:01 PM »
4wd,

Thanks for the link and the information.  I went out and tired to get an Allen wrench into the set screw just below the housing.  I tired english and metric sizes and could not get one to actually fit.  I looked in my book (I still have the original box which I was getting ready to recycle) and could not find one that I might have left in there.

The instructions say the wind cups should be as close to the base as possible.  I don't think I can get them any closer.  I spun the cups multiple times trying to get some friction to may wear away any corrosion but I don't think that will work.

If any one knows the Allen wrench size, I like that information.

Question, was disassembly hard to do?

Offline niko

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Re: Davis Anemometer Issue
« Reply #3 on: January 10, 2019, 10:13:55 PM »
It's a .05" allen wrench, I think that info is in the ISS manual. I just measured one as 0.048 so 0.05 looks correct.

Offline bitsostring

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Re: Davis Anemometer Issue
« Reply #4 on: January 10, 2019, 11:27:00 PM »
Wow, a metric Imperial Allen key? About 3/64" (0.047") in old money?
It's meant to be fun. . .

Offline niko

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Re: Davis Anemometer Issue
« Reply #5 on: January 10, 2019, 11:38:23 PM »
That's how Davis specs it :dontknow:  We like mils here, or thou as you Brits call them  :wink:

Offline bitsostring

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Re: Davis Anemometer Issue
« Reply #6 on: January 10, 2019, 11:45:21 PM »
I know, only kidding  :)
It's meant to be fun. . .

Offline niko

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Re: Davis Anemometer Issue
« Reply #7 on: January 10, 2019, 11:57:17 PM »
 :lol:

Offline carolinarider

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Re: Davis Anemometer Issue
« Reply #8 on: January 10, 2019, 11:58:02 PM »
niko,

Thanks for the info. 

A 3/32 allen wrench is 0.047 inches and a 1.5 mm wrench is 0.059 inches so it must be close to a 3/32. 

I tired the 3/32 but will try again.


Offline bitsostring

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Re: Davis Anemometer Issue
« Reply #9 on: January 11, 2019, 12:00:38 AM »
3/64" is 0.047". Not kidding. . .


« Last Edit: January 11, 2019, 12:02:25 AM by bitsostring »
It's meant to be fun. . .

Offline niko

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Re: Davis Anemometer Issue
« Reply #10 on: January 11, 2019, 12:30:09 AM »
3/64" is 0.047". Not kidding. . .

Yup!

3/32 is 0.09375 in old math  :?

Offline carolinarider

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Re: Davis Anemometer Issue
« Reply #11 on: January 11, 2019, 03:08:28 AM »
Thats why I don't have one that fit.  Math can be hard sometimes.  :D

Offline niko

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Re: Davis Anemometer Issue
« Reply #12 on: January 11, 2019, 03:23:36 AM »
Ain't that the truth  :lol:

Offline aardvark

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Re: Davis Anemometer Issue
« Reply #13 on: January 11, 2019, 03:21:34 PM »
Ain't that the truth  :lol:
   old math is good math.
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Offline niko

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Re: Davis Anemometer Issue
« Reply #14 on: January 11, 2019, 03:48:35 PM »
   old math is good math.

I was already confused by new math, but then came common core  8O