An Ingenious Way to Turn Neodymium Permanent Magnets On and Off - Magswitch. . .

[NTesla]

@NTesla,

The guy looks like he's applying around five pounds of force to levering the switch in that video. That would accelerate an iron rotor with four hundred pounds of force if switched off at TDC. That's an eighty to one gain! I would just buy one of those switches for the hundred bucks from K&J Magnetics to experiment with.

Hundred bucks!? The link to the manufacturer has just the MagSwitch (60lbs of force) for $17.75US here

https://mag-tools.com/magswitch-magjig-60.html

I think I might buy a couple and do a proof-of-concept design...see if I can get a rotor to rotate using the Mag-switches with either a iron rotor block or perhaps a magnet. Even with the losses from the metallic ring around the switch it may still work...

[PIH123]

@NTesla,

The guy looks like he's applying around five pounds of force to levering the switch in that video. That would accelerate an iron rotor with four hundred pounds of force if switched off at TDC. That's an eighty to one gain! I would just buy one of those switches for the hundred bucks from K&J Magnetics to experiment with.

This is one of their cheaper items

Magswitch Mag-Utility Hook 25 8100012
$33.60 at CyberWeld
http://store.cyberweld.com/mamahaho30.html

These are also very goo (and strong)
http://store.cyberweld.com/stwemaadohed.html


I use MagSwitches often.
They have been around a long time in one guise or another.

They are used very often in welding.
They are a very common earth clamp nowadays.
Also many other magnetic welding holddowns.



I can't see any FE benefit from these, but they might be fun to play / experiment around with.
It takes a few pounds of force over a half turn to go from on - off and vice-versa.
But the switch does replenish energy in the system.

I am sure I can cause a few thousand pound boulder to roll down a mountainside with a simple lever.
As long as I am not the one putting it there in the first place, and getting it back to the top is the trick.

So definitely not an 80 to 1 gain.

[PIH123]

I will get a spring balance from a friend and do a test for you.

I have a Magswitch 300 amp Welding Ground Clamp - (8100315)

You will want to know the pulling force and the radius of the knob correct ?

BTW, the force required to "throw the switch" is not linear.
It goes from very weak at the beginning, increasing to a few pounds near the end of the half turn.
The diameter of the knob is 1.625 inches.


Just a thought :
The linear motion of the other type of clamp
http://store.cyberweld.com/stwemaadohed.html
might be easier to incorporate into a test setup as opposed to the rotary motion of a magswitch.

[synchro1]

I will get a spring balance from a friend and do a test for you.

I have a Magswitch 300 amp Welding Ground Clamp - (8100315)

You will want to know the pulling force and the radius of the knob correct ?

BTW, the force required to "throw the switch" is not linear.
It goes from very weak at the beginning, increasing to a few pounds near the end of the half turn.
The diameter of the knob is 1.625 inches.


Just a thought :
The linear motion of the other type of clamp
http://store.cyberweld.com/stwemaadohed.html
might be easier to incorporate into a test setup as opposed to the rotary motion of a magswitch.

@PIH123,

"Strong Hand® MSA46-HD Adjust O Heavy Duty On/Off Welding Magnet "has patented ON/OFF switch", making positioning easier and safer".

I've played with this model at "Harbor Freight". The switch force is small. The problem is that the one switch operates the two faces.

[synchro1]

Here's their Dual Switch model:

Adjust-O™ 90° Dual Switch Magnet Squares

Angle magnet squares with the convenience of On/Off switches.

For professional jobs that demand strong hold down forces. Hold flat and round metal work pieces.
•Two On/Off switches for independent operation.
•Turn the magnets Off when setting up, turn On when you're ready to work. Easy and safe set-up!
•Precision machined flat and V-surfaces are ideal for round and square tubing, angle, and flat stock.
•Choose from 120 - 265 LBS (55 - 120 kg) pull force.

A small servo and trigger switch would deliver 265 pounds of pull force at TDC to the ferrite rotor from one face! This model would spin a very large and heavy iron rotor. Saturation's our enemy, so slow and heavy is best. This model could probably power a large 360º pendulum. Naturally, "High Permeability" rotor material would allow for higher R.P.M. It might be possible to use both 90º magnet switch faces with an "L" shaped rotor.