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2 votes
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What are the benefits of using a spring as a drive screw in this electronic deadbolt?

The reason drive screws are used is because they give mechanical advantage. Solenoids are linear devices and don't have inherent use leverage for mechanical advantage. A rotary motor with a small ...
DKNguyen's user avatar
  • 5,606
2 votes

How to restore the magnetism on a fridge door joint

Agree with Solar Mike (always a good idea IMHO!). Note that magnets of that type do not "lose" their magnetism over time, but that the attraction of a magnet to a piece of steel drops as the ...
niels nielsen's user avatar
2 votes

How to restore the magnetism on a fridge door joint

Most likely the door seal has gone hard, so replace the door seal - more flexible with a new magnet as a bonus.
Solar Mike's user avatar
  • 15.8k
1 vote

Can this new AC motor/generator design work?

I'm not great with the theory of electromagnetism but the one principle that I do understand is that air gaps are the application killer. Have a look at any electromagnetic circuit and you will see ...
Transistor's user avatar
  • 10.8k
1 vote

How do I design this magnetic bed?

I don't wish to encourage you in this project as I think you have picked up some bogus terminology (positive and negative fields and poles) from whatever sources you have been reading and I suspect ...
Transistor's user avatar
  • 10.8k
1 vote

Magnetic Locks On Metal Gate

Magnet holding strength will be greatly reduced by any air-gap (or non-ferrous material in the gap) so you want to avoid that. I recommend a small shock-absorber that will slow down the closure but ...
Transistor's user avatar
  • 10.8k

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