![]() Our Bulldog kits are equipped with everything you need for your next trip. Allround 360° magnets have magnetic forces in every direction surrounding the magnet.Single sided fishing magnets use a concentrated pulling force on a single side.It’s almost like having two powerful magnets working in different directions to help you search for treasures underwater. Want to see all our data? Check out this PDF, where we detail all the distances and measurements we made.The most important magnet fishing accessory is the magnet.ĭouble sided fishing magnets have a pulling force on two sides to increase the quality and quantity of finds. Not only can it provide solid answers about forces you can expect in your specific situation, but early prototyping might also reveal important insights about qualities that are harder to quantify or predict. When choosing magnets for your own project, consider this sort of quick, prototype testing up front. What does “better” mean, anyway? In the case of that bottle cap catcher, maximizing pull force turns out to be a horrible measure of what we really care about – holding the most caps. In the end, this kind of thinking leads us away from simple, measurable performance specs like pull force. Opposite poles facing out didn’t work well at all. Magnets with the same poles facing out could accumulate a huge pile of caps. The opposite-pole trick provided a stronger pull force to a single cap, but “short circuited” the magnets. On the other hand, the goal of our Magnetic Bottle Opener was to catch and hold as many steel bottle caps as possible. We think this effect might be more pronounced when sticking to thinner steel objects. Getting a thin steel knife to stick across a small gap, it was much better than a single long magnet. When making a Magnetic Knife Holder, we found the opposite poles setup to be hugely beneficial. Mixed conclusions like this aren’t limited to this experimental data gathering project. Two magnets with the same pole facing the steel, mimicking a single, larger magnet, reaches across a larger gap with more force. ![]() At larger distances, performance was worse. We found that for magnets touching or close to the steel surface, the opposite pole strategy provided more pull force. When the two magnets are far enough apart, the magnetization direction doesn’t seem to matter very much. We find less pull force if the poles are facing in the same direction. When the two magnets are close to one another, we saw more pull force when the poles are facing in opposite directions. Our measurements matched what we expected, mostly. Below are the experimentally measured results for magnets touching the steel plate: Gap between magnets: We measured them both with the poles in the same direction and with the poles facing opposite directions. We measured the pull force of a pair of magnets with various distances between them. ![]() The result depends on the size and shape of the magnet. We found that the pull force might be 70-85% of the doubled, single magnet pull force spec. We estimated a number of sizes this way, making educated guesses using our online Pull Force Calculator. How much less? It depends on the shape of the magnet you’re considering. In general, two magnets close together like this will provide a bit less than double the single-magnet pull force.
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