Details of magnetic mounting of fixtures on electromechanical shakers? 1

[davidd31415]

I've seen "magnetic mounting" systems, such as those integrated by Technomagnete and I'm wondering if anyone has heard of these being used to mount fixtures on electrodynamic shakers?

The two concerns I see are the magnetic field of the mounting equipment interfering with the shaker operation and the rigidity of a magnetic mount.

Thanks for any details.

David

 

[IRstuff]

There's no interference problem, if there were, there would be problems with any electronics being shaken.

The rigidity is a bigger problem. The structure has little shear strength, so there'll be slippage in plane. Likewise, since it's not a solid connection, there'll be some inability to maintain rigid contact with the fixture.

Frankly, I see no benefit in using a magnetic mount, and plenty of downside.

TTFN

FAQ731-376

 

[davidd31415]

The benefit I see is similar to that provided by magnetic accelerometer mounts. Setup and teardown times would be reduced.

If fixture can not be coupled to the shaker with a rigidity similar to what is achieved with fasteners it would not be acceptable though.

 

[floattuber]

Interference shouldn't be a problem.

Rigidity would be a problem depending on the levels and the frequencies involved. Frequencies in the single and double digit range might be ok, but I wouldn't trust it much higher.

Also, most slip plates, head expanders, and cubes are made of magnesium and some are aluminum. Neither work very well with magnets. The reason these things are made of Mg and Al is because of their inherent lightweight and vibration damping properties (more so with Mg). Steel can be problematic because of the lack of damping.

 

[IRstuff]

Seems to me that if you really wanted rapid changeout, you'd be better off with some sort of channel-lock type mechanism

TTFN

FAQ731-376

 

[MotorVib]

I have use both magnetic mounting and rigidity. The only problems that I have had with magnetic mounting is for long running tests and when I am checking highter freq. The magnetic mounting on long running test sometimes will move, but on the plus side it is smiple to set up and take down and if you are going to run a lot of tests or if you want to move around it is the best.

Chris

"In this house, we obey the laws of thermodynamics." Homer Simpson