![]() ![]() The performance difference is very small with the coils left in. So you might want to have an extra available if you try this. By prying the motor open, you also risk bending and ruining it. However, there will be a bit more resistance in the bearings from cogging, and it will take a couple more mph of wind to set your anemometer spinning. Optionally, you can skip that entire step. Gently press the motor back together - if you go all the way back in now, the motor will bind and not spin freely! Gently pry the coils out using a flathead screwdriver. Gently tap the center bearing loose from the back using a Phillips screwdriver and small hammer. Place the bearing assembly upside down in a vise so it's suspended by the flange. Cut it deep enough so that the sensor can ride flush with the pipe. ![]() Using a file, cut a notch in the flange just big enough to fit the sensor from your bike speedometer. This gives a wide, tapered rim surface to mount the bearing assembly to. Mounting supplies - 1.5 inch diameter PVC pipe for mast telephone or other thin wire to extend sensor wire.Ĭut the PVC pipe reducer off with a hacksaw right at the flange, on the big 2 inch side.Tap - a #4-40 tap, available at hardware stores.Glue - epoxy, PVC cement, and thread lock compound are needed.3 Machine screws - #4-40, 1/4 inch long.PVC reducer fitting - 2 inch to 1.5 inch white PVC reducer coupling.You could use any sort of bearing assembly you can devise from scratch, just make sure it spins VERY freely. For this project, we used the same ball bearing DC brushless PM motor as in our Easter Egg Anemometer, and we removed the coils to make it spin more freely.we just need the bearing for this project. You want it to spin as freely as possible, so you can get better response and also measure very low wind speeds. Bearing Assembly - Many different designs of bearing assembly will work.It's Item #75 on our Shopping Cart, and costs only US$0.20. NdFeB Magnet - The magnet that comes with the speedometer is a rod shape, and we found it easier to fit a 3/8 inch diameter by 1/16 inch thick disc magnet to the cup assembly rather than the rod.Check out our Easter Egg Anemometer page for details on how to build your own. Anemometer Cup and Hub Assembly - You could use any commercial or homebuilt cup assembly for this.It's available at almost any bicycle shop for about US$25. ![]()
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