Variable Speed Shaker?

Put it in the back of the truck and find an old dirt road... springs we need more springs...maybe a spring mounted see-saw device....

Whoa partner! ... more levers we need more levers!

I guess it depends on the action desired, back and forth, up and down, round and round, just vibration, speed of oscillation....An old sawzall will shake the crap out of anything...but do you need a shaker, or a mixer...?

https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=paint+shaker&_sacat=0

You're on the right track with that..

but too stable.. so.. neigh

When it comes to shaking,... a Shetland pony trot is the answer.

of all the Horses and pony’s I’ve riden, the Shetland pony trot is the most uncomfortable pace...

Well if you figure out a way to strap your breadbox to one of these creatures in some way, I think it would be well shaken...

There’s a little Rube Goldberg in all of us...

An empty coffee can (Fits in a bread bow) inside a home cement mixer. (Maybe with some sand ballast to deflect of the internal mixer paddles.

We once modified a mixer to have a wooden "bowl" with no mixer paddles and could put tins of small pressed metal parts inside then "rumble them" to remove burrs and sharp edges. Various additions made (like pulverised walnut husk or hardwood sawdust) to change the intensity of the rumbling process.

Otherwise, create a small stone tumbler device (two parallel rollers, driven at end) to roll the drum with the items to be shaken inside. Change roller diameter or drum diameter to get different roll-over rates.

looking for a durable compact shaker.. not a rock polisher?

Here's a crazy idea. Maybe you could rig something up to a jigsaw...

That's the right track.

Put a 2 pound blade on there..

Just a motor with a rotary to linear linkage maybe...

A guy I used to work with made a similar device with a wire basket to separate rocks from soil.

LOL! I have a basket with weeds growing through it that runs on an old squirrel cage fan..

The fan's main flat is the disk I kept. I cut the rest of the fan off. Bolt a "slight" imbalance to the motor-mounted disk and you have a fly weight. Bolt the whole shebang to the bottom of the wire basket and hang it, and it shakes as much as you want to bolt...

Fill the basket with dirt and turn it on and Voila! Small sh*! through the grate, Big sh*! in the basket. Easy-Peasy!

I don’t know what your Requirements are... there are different intensities.

1. there’s pneumatic vibratory shakers they use on silos and bins which are pretty mild, they are adjustable with a flow control valve.
2. also they use offset weight for vibratory conveyors for more travel. Reynolds/Ajax is pretty commonM this actually would move product. They are adjustable, with a frequency drive,

those are tooooo awesome. recycling parts for this project as much as feasible.

Phoenix911,

Your Renolds/Ajax diagrams are (GA)great ! They show exactly how to isolate the motor from the shaking at the end of a belt. It strikes me that JE could take a car differential with the single input drive shaft fastened solidly to the differential housing mount, drive one wheel shaft with a belt, and pour lead into half of each brake drum to implement the weights. The two wheel drive shafts could be shortened dramatically to get it down in size(or not). The beefy differential gears and bearings are already built for high forces and the parts are all scrap yard commodities. If JE can afford the space, the vibrations can be a twist off of the differential housing(perhaps with a torsion suspension of the entire rear end assembly) or a straight line oscillation off of either or both of the "eccentric brake drum" bearings. These oscillations might easily be super powerful and reliable as well as cheap. If the space is not too severe an issue, the offset weights could skip the lead and use concrete poured into rubber tires to fill them to half. The concrete is cheaper than the lead and the displacement in the shaker is greatly increased. What a powerful shaker at junkyard costs !

This reminds me of a whirlygig (kid powered carousel) my father built for me from junkyard scrap(including a car axle) when I was nine years old. The whirlygig took enormous abuse and with occasional wooden seat replacement was good as new when I went off to college despite being kept outside in our backyard. The two-kid railroad handcar style spinning whirlygig was large, fast, and smooth and with the "sand surround" amazingly safe. Every kid in our neighborhood had Popeye arm and leg muscles from riding it. Automotive part re-purposing is wonderful !

_____________

thewildotter

Scaling

I am sure someone out there will glibly dismiss the automotive repurposed discussion as irrelevant because the spec was to fit in a breadbox. I wrote this reply to my own comment to dismiss their objections.

Breadboxes are not a single size, automobiles are not a single specific size, and the original post is to provide the concept involved not necessarily to nail down any specifics. The automotive differential concept can be found in scaled versions in lawn mowers, robots, toys, and even nano-machines. Your average shade-tree mechanic understands the automotive instantiation of the concept. If you want to scale it, you immediately run into the problem that almost any other use of the same concept is less well understood and less standardized. The second scaling issue is that other examples of the concept are likely to be less of a commodity and are therefore more difficult to find and especially more difficult to find cheaply. So, for the casually dismissive, please look for the concept as implemented in what you may have on-hand for little or no expense. I am not insisting on using the back end of your family truckster. Be aware, though, that scaling is often accompanied with other changes such as materials choices. Do not use your zip-zap differential made of polystyrene plastic and then gripe at me that the vibrations ripped the teeth out of its gears.

Also, for those who may not have instantly understood... If you stop the drive input on a differential and rotate one wheel, the other wheel will counter rotate. That is, you get the counter rotating eccentric weight motion that you see in the Renolds/Ajax custom vibrator. Their custom designs keep the eccentric weights closer together so the automotive differential implementations get more torque at the center. That torque may be an albatross or it may be a feature depending on your perspective.

____________

thewildotter

I don't know, but I did find this.....

Believe it or not, this is a hand crank washing machine...it's for when you're out camping and don't feel like beating your clothes on some rock....

...and no service is available....

Oh Brother where for art thou ladies of the laundry!?

You can keep the uh? what was that?

https://www.harborfreight.com/5-lb-metal-vibrator-tumbler-67617.html

To much purr, not enough pounce.

Old washing machine motor & gearbox?

I think I have some old exercise equipment motor and gearbox that will work ... out..

thanks for the idea

If by chance you don't have a breadbox,,, I might have one laying around here. I could lend it to you as my contribution to " the team " .

Sounds Like a good way to save some dough. I'll by some flours with it.

ButtKicker Theater Seat Shaker

The Texas Spirit Theater in the Bob Bullock Memorial Museum in Austin, TX uses something like this to startle visitors when cannons fire or thunder rolls in the videos they show on Texas History. The great advantage is that it can be driven with great flexibility with powerful audio amplifiers fed with the soundtrack of the video for great tactile stimulation in complete synchronization with the audio. The cost will probably be higher than some motor with an off-center driven weight but the control is phenomenal. You can use open source audio editing software to program in exactly the frequencies, amplitudes, and even phase that you want and since it is music incredibly elaborate sequences can be created with great ease by anyone fluent in music editing software.

_____________

thewildotter

The bearings on a fan motor are only designed for running balanced fan blades, they would not last a hour with a deliberately eccentric load. If you added pulleys and a belt between the motor and the eccentric shaft that would both work for your bearings and allow you to gear the speed.

Old wiper motor with an arm to hold cans (3 speed is good) been using one for years spray & 2.5 pint cans make arm so half can is at spindle hight

Perhaps this. Disconnect the coin box and wire the working end to a variac. (I mounted one under our bed but connected it to a simple timer). https://www.ebay.com/itm/Magic-Fingers-Vintage-Motel-Hotel-Bed-Vibrator-w-Coin-Register-Box/303606726455?hash=item46b05eff37:g:mqAAAOSw7ANe9fmV

More options here.

I found these ideas looking for something else . . .

https://www.google.com/search?q=spray+can+paint+shaker&rlz=1C1GCEA_enUS872US872&oq=spray+can+paint+shaker&aqs=chrome..69i57.8263j0j8&sourceid=chrome&ie=UTF-8

What I started to look for was an old AMA tip to shake spray cans using an off centered wheel mounted in a 3" PVC pipe. You slide in a spray can, connect your VS drill to the eccentric wheel, and run the drill at an appropriate speed to rattle the spray can.