.

[chipdouglas]

solenoids are either push or pull type. either way there is a stopper in there that limits the travel.

also, induction heaters do have a strong magnetic field.

At work, I have a machine that is a low voltage high current machine. it simulates high amps that are needed to test a circuit breaker. it out puts up to 50,000 amps at less than 20vac. anyways. when I run it over 10,000amps, any steel in the area gets sucked in right away. and if I have any loose connections, it almost instantly turns cherry red and pops.

Michael.

 

[Sigurthr]

Aluminium doesn't ball up because above about 700F the surface rapidly reacts with oxygen in the air forming aluminium oxide which has a much higher melting temperature than aluminium. AlO2 also has an extremely high surface tension and is less dense than the Al, so it always floats to the top.

 

[Cyparagon]

solenoids are either push or pull type.

I googled the push type, it looks to me like they're arguably the same thing as a pull type. The coil pulls the metal into the center, and a tiny push pin pops out the other end.

 

[chipdouglas]

Correct.

 

[The Lightning Stalker]

Those are very common in doorbells.