Build a Shaker Screen Box: Source Eccentric Drive Gears

[parttimefarmer]

TL;DR Summary

where does locate eccentric drive gear

I am hoping to build a shaker screen box, to sort sand from gravel and rocks.
Want to use an eccentric drive gear to move the screen creating a vibration that would shift sand through screen mesh and over size rock wold flow off top of screen.
Have not been able to find a source of eccentric drive gear to use or even to look at in the market place.
Does anyone have sources for the eccentric drive gears.

 

[jrmichler]

That's because they are not catalog items, so you need to make it yourself. Buy a gear, drill a hole, and press in a dowel pin. A good source for standard size gears, dowel pins, rod ends, bearings, and similar parts is McMaster-Carr Supply Company, www.mcmaster.com. They specialize in small orders to anybody with a credit card, and don't care if you are an individual hobbyist or a big company.

Their catalog is almost 4000 pages of every gear, bearing, bolt, and gadget you can think of, plus much more that you never heard of. It's the ultimate gadgeteer's wish book.

 

[Dullard]

+1 on McMaster. See also:
https://sdp-si.com/

 

[Baluncore]

You do not need an eccentric gear, which is a wheel with teeth.
You need an eccentric bearing. Google images 'eccentric bearing'.

https://www.dustspares.co.uk/shaker-parts/Eccentric-Bearing.html

Eccentric bearings are used on agricultural harvesting equipment.
The type of bearing (bush, ball, needle or roller), and the size of the bearing will depend on the speed and the power being transferred.

You can make your own eccentric by drilling a disc off-centre. You can reduce power by tuning the spring mountings of the shaker table to the excitation frequency.

 

[Averagesupernova]

You do not need an eccentric gear, which is a wheel with teeth.
You need an eccentric bearing. Google images 'eccentric bearing'.

Eccentric bearings are used on agricultural harvesting equipment.

The image in the first post of this thread shows what is very similar to the shaker drive on a combine harvester. With a username of @parttimefarmer it surprises me you haven't stumbled across this.