The Liberator Got the Shakes

As mentioned in the previous post, a soil-grate shaker is necessary to help tractor-loader buckets of soil fall through the 3/4 inch spacing of the grate on the CEB machine, The Liberator. Welcome to the open source vibrator:

Open Source Vibrator from Marcin Jakubowski on Vimeo.

It shook the work table up quite a bit when tested. It consists of a small, 600 rpm hydrauilic motor, and a 6 lb eccentric hammer attached firmly via 2 pillow block bearings. When attached to the CEB soil grate, it did a good job of shaking:

Open Source Vibrator on Soil Grate from Marcin Jakubowski on Vimeo.

When a bucket of soil was loaded with the Pulverizer-Loader, small soil particles were shaken through:

Vibrator in Action from Marcin Jakubowski on Vimeo.

The end product was that eventually, the fine soil particles went through, and all the larger clods shook off the front of the soil grate (3/4″ expanded metal):

Vibrator Results from Marcin Jakubowski on Vimeo.

Soil shaker is done. Next.


  1. Michael Koch

    Looks great, but you should definitely put in place a guard to protect users from the vibrating mechanism!

  2. Gordon

    This is going to slow things down. could you pre filter the lager bits out before they go into the hopper

  3. Freedom of Press | Open Source Ecology

    […] valves) to 5 (extra one for the shaker motor) channels, depending on the strategy for powering the soil shaker. Proper packaging must be considered for the design. Who can […]

  4. […] is controlled fully by magnetic position sensors, and we added a soil sensor for activating the grate shaker. We’re building on Arduino and RepRap […]