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Old 05-16-2013, 12:36 PM   #1
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Magnet pull force question here


if a magnet is rated for say 50 lbs, is that an accumulative number meaning;

say its latched onto something on the north side, does that mean south side strength would diminsh,

or

does that rating signify on north side it has 50 lbs and on its south side it will also have 50 lbs of force?

Anyone!
Thanks

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Old 05-16-2013, 12:44 PM   #2
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Magnet pull force question here


Having something attached to one end of a magnet does not significantly change the amount of magnetic flux going through the other end of the magnet. If something is attached to one end, you should be able to attach something to the other end and it should hold with about the same force. The rated pull of the magnet is probably overly optimistic. It will only pull that hard when attached to flat, thick, pure, clean iron. The actual usable holding force in reality will be much less than the ideal maximum.

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Old 05-16-2013, 12:46 PM   #3
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Magnet pull force question here


It means it can hold 50lbs of force total. if you attached the magnet to a fixed surface, and then hung something to the bottom, the most you could hang from it would be 50lb. Keeping in mind this is strictly talking about a vertical hanging load.
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Old 05-16-2013, 12:50 PM   #4
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Magnet pull force question here


Quote:
Originally Posted by jratftcc View Post
if a magnet is rated for say 50 lbs, is that an accumulative number meaning;

say its latched onto something on the north side, does that mean south side strength would diminsh,

or

does that rating signify on north side it has 50 lbs and on its south side it will also have 50 lbs of force?

Anyone!
Thanks
I'm no physicist but my knowledge of pull force and testing of items by pull or torque is the gravitational force of the mass (item). So... if you have a magnet rated for 50lbs and you latch it to the north, you would need a gravitational pull strength of more than 50lbs in a south direction to unlatch it.
I hope this was helpful or at least amusing...
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Old 05-16-2013, 01:23 PM   #5
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Magnet pull force question here


Thanks everyone...kinda makes sense

Ill buy a a few small magnets and test them out first, before buying the true sizes. Im not made of money which is why I ask questions....so I dont have to spend money testing myself things that are already mathematic.

Appreciate all the input.
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Old 05-16-2013, 03:30 PM   #6
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Magnet pull force question here


Uncoated flat magnets on very flat surfaces hold best. The perfect flatness of the surfaces is the most important thing. The closer the contact between the magnet and the metal surface, the larger the force. 0.005" separation may be good and look flat, but 0.001" separation will provide much more holding force. Paint on either surface will reduce the holding power greatly. You also want the metal surfaces to be thick, wide, and pure iron or steel.
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Old 05-17-2013, 08:57 AM   #7
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Magnet pull force question here


thanks poutlon for that...I will defintely keep all that in mind.
smooth surfaces and no paint

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