Instructables
Picture of DIY Magnetic Hooks
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This instructable explains how to quickly and cheaply create a magnetic hook, which can hold weights till 500 gms.

 
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Step 1: Things required

Picture of Things required
You will require:
A neodymium magnet
A bottle cap, the kind that is made of metal and can stick to the magnet.
A wood hook, the one with threads.See image for how it looks.


Tools:
A hacksaw or a pliers that can cut the hook threads.
A knife to remove the rubber linings from within the cap.

Step 2: Assembly

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Cut the threads of the hook, flatten the end which is cut with a filer or sand paper.

Gas weld this hook to the bottle cap. I had access to a gas welding equipment with garages who repair dents on auto rickshaws in Mumbai.

Soldering the hook is another option. Use flux for a cleaner joint, and sand off the cap to get a real nice shiny metal. Solder will not adhere with metal that's painted or corroded.

For folks who do not, use an epoxy like Araldite or a glue gun, but I am pretty sure it won't hold much weight. Welds are best.

Place the magnet inside the cap and attach to the metal object on which you need a hook.

Spray paint it to your desired colour.

I made this hook to attach my model airplane on the ceiling. My ceiling is made of plaster of Paris, and has metal screws on which this magnet holds well.

Step 3: Measure holding strength

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Take a plastic bag and fill it with some water, place it on hook.
If it doesn't fall, add more water.

continue above steps till you see the bottle cap sliding or moving under the weight of the water.

measure the volume of water with a measuring cup. 100ml of water weighs 100gms approximately.

My magnet could hold 1/2 kg effortlessly.
rupin.chheda (author) 11 months ago
Yes, I used a soldering iron with an old unused bit.
Its best to remove it before doing the weld, because its easier to remove.

It is very important to remove the rubber/plastic lining, because the strength of the hold is influenced by how good contact there is with the metal.

My experiments showed that the rubber lining decreased the holding weight from 1/2 kgs to somewhere close to 350 gms.
greendayfan45711 months ago
Is it possible to use a small flame like from a lighter to melt the plastic from the bottle cap? In my opinion it seems more dangerous but also more affective to get rid of the plastic easier
rupin.chheda (author) 11 months ago
Thank you!
artworker11 months ago
Awesome idea! Nice way to measure!