davyken(at)comcast.net Guest
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Posted: Wed Aug 22, 2007 10:24 am Post subject: No Title |
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A long time ago I found directions on the list to build my own degausser. It wasn't hard and worked pretty good. I mounted a rheostat on a board with a large light bulb. From that I ran a long wire that I could wrap around the part with a magnetic field. Run the rheostat down to zero, the light bulb goes out and the magnetic field is gone.
I'll attach a photo. It's a little dark but the wire is wrapped around the axle.
I did this because I found that after cutting my axle in half, there was a large enough magnetic field that I could pick up one half of the axle with the other. I used this method to remove the field from these parts and form all of the tubing around the cabin.
Hope this helps,
Ken Davy
N1701S
Classic IV 912
Time: 10:41:19 AM PST US
From: Guy Buchanan <bnn(at)nethere.com>
Subject: Re: Magnetic Compass
At 10:05 AM 8/21/2007, you wrote:
Quote: | Anyway -- Has anyone found a way to damppen or get rid of thes
magnetic interference ?
Hi George,
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Check the archives, this has been covered before. I had the same problem and it was caused by residual welding fields in the tube frame, particularly the two upper panel mount tubes. I originally had to rent the big degausser from Sacramento Sky Ranch and degauss the entire area. I was able to eliminate enough interference to correct the remainder with the compass correctors. Sometime later I accidently did a bit of welding, shorting the battery, which renewed the interference. This I was able to eliminate using a little hand degausser I bought off the web. (Apparently this second time I only magnetized the surface of the tubes. When I tried the hand degausser before it hadn't helped at all.) There's a little round, fairly inexpensive, gauss meter you can buy to check the magnetization of your structure. I recommend it. The only problem with the big degausser is that you need to keep your avionics/electronics at least 12" away from it when it's running. Otherwise you 'll mo dify them.
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