Inexpensive DIY Anemometer
Page 5
Bolt an arm on with one nut and bolt. You can see that we need to put a little curve into the tail of the shank to make it fit properly around the circumfrence of the cap.
Working slowly, one tiny bend at a time, bend the tip of the metal in small increments until it fits ...
... like this.
Using a straight edge, make sure the arm is parallel to the rim of the cap, and then drill the second hole, and add the second nut and bolt. Repeat this process for each of the three remaining arms.
When you're done, it'll look like this.
NOTE: After mine had been in the wind for a few weeks, the cut arms started to come loose. I reassembled them to the cap using a little 'Threadlocker' from the auto parts place and they never came loose again.
Now for the bottom weather cap. The bottom bearing mount has a rim that we have to remove so that the cap will fit over it, hiding the bearing, shaft, and nuts on the bottom. The grinder works well for this. Now, bolt all the pieces together, and . . . . . . .


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This page has instructions and plans for building a DIY weather station instrument called and anemometer. An anemometer is a weather station instrument used to measure the speed of the wind. Weather stations also usually include a thermometer, barometer, and maybe a hygrometer. This set of pages includes the plans, instructions, schematics, and photos need to build you own weather station.