Electronics > Beginners
Need vibration 24/7 for a few weeks without breaking
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Gyro:
You could try a 'Bass Shaker'. They're designed to make your furniture shake in response to 'subwoofer moments' in films.  ::)

You might get better efficiency than with a standard speaker, at least around resonance....  https://cpc.farnell.com/visaton/bs130-4ohm/bass-shaker-4-ohm/dp/LS04225?ost=shaker&krypto=sAcEhSN53rTcgNyJqND2IvBr5vor3JSMJ3zz2%2BDbi2MXlKKg5kraAg9QasXDMNrHajc%2BV%2FQXF9jlQcZ3oTpHKQ%3D%3D&ddkey=https%3Aen-CPC%2FCPC_United_Kingdom%2Fsearch
Kleinstein:

--- Quote from: shanezampire on June 24, 2019, 05:09:57 pm ---I had one them old sanders you attached the sandpaper to. The pad was broken and you couldn't attach sandpaper to it no more. I attacked the plastic lid from a jar to it with screws. I put my small engine carburetors and cleaner in the jar, screwed it to the lid, and turn it on for a few hours. It vibrated them very well. It was a Black & Decker Mouse Sander/Polisher/Detailer if you want to see which one I used.

--- End quote ---

Those sanders may last a week (some 168 hours) or so. The normal life of carbon brushes found in the usual motors it at some 300 hours and not all those sanders get to the point of changing the brushes before the bearings break down. It may be slightly better when shaking as there is less dust.
David Hess:
Another way which lasts longer than putting a weight on the motor shaft is drilling some material out of the rotor inside the motor so the motor bearings carry the unbalanced load evenly.  This is easy to do with inexpensive shaded pole AC motors and being inexpensive, replacement costs are low.
jmelson:

--- Quote from: cur8xgo on June 23, 2019, 06:44:36 pm ---

Take a motor, put an offset weight on the shaft, and attach the motor to a plate which is attached to your container. Speed of motor = frequency of vibrations, mass of weight and distance of weight from shaft set amplitude of vibrations.

--- End quote ---
Right, our shop has a vibratory polisher.  It has a container on top, and a rubber-supported plate on the bottom with exactly this sort of setup attached to the plate.  I know our shop has let the thing run overnight polishing some parts.  It gives a pretty hefty vibration, too, that jumbles parts and ceramic polishing stones with a little "soup".

Similar devices are used in the gem, mineral and jewelry trades.

Jon
Rick Law:
You can also consider using an MCU to control a few vibrators to spread the duty around.  So, (let say you have just 4), the MCU will let #1 work for a while (say 10 minutes), then it switch on #2 and let #1,3, and 4 rest.  So on.  By spreading the actual work time to multiple vibrators, it should make make the whole set up last longer.  If you want to be fancy about it, you can even add vibrator-failure detection and skip the failed one plus generate an alarm letting you know on has failed.  With that, you know as long as one vibrator is still working, the darn thing is still vibrating.  Now you can implement "hot swap" like they are hard disk RAIDs.

Even if you use something as simple as the Arduino NANO as the controller, it can control >6 vibrators easy. It wont put out your 40mA, you need to add a switch be it a relay, transistor or whatever for that vibrator-driving current.  But, the Nano can do the control functions for half a dozen "coin vibrators" easy.
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