A peanut sheller https://www.shellermachine.com/peanut-sheller-machine was designed by Zeno farm machinery. The peanut sheller consisted of four primary systems, the feed hopper, shelling chamber, hull aspiration system, and two shaker/sizers. The feed hopper was a gated box situated over top of the shelling chamber and was separated into three different sections so that each section of the sheller could be fed separately.
The shelling chamber was an open cylinder and concave design with three stages . The cylinder for each stage consisted of two metal bars made of 15.9 mm square stock mounted 180° around a 152-mm diameter disk on each end. The diameter of the shelling cylinders was the same for all three stages; the only difference in the shelling cylinders was their length. The lengths of the first, second, and third stage shelling cylinders was 267 , 181 mm , and 95 mm , respectively . The shelling grate was a screen punched from 12-ga mild steel sheet metal then rolled to wrap 320° around the shelling cylinder. The diameter of the shelling grate and the screen openings depended on the sheller stage in which it was placed. The screen openings decrease from first to the third stages of the sheller, because each stage is intended to shell progressively smaller peanuts.

As peanuts are shelled, the hulls, kernels, and small unshelled peanuts fall through the screen and into the aspiration chamber. The aspiration chamber is a rectangular section where air is flowing upward through a centrifugal fan and into a collection bin. The hulls and light material from the shelling chamber are lifted from the material stream and carried into the collection bin. The unshelled peanuts and the shelled kernels fall onto the top shaker screen equipped with 9.9 × 31 mm slotted screen. The material larger than 9.9 mm should be mostly unshelled peanuts and is carried to the end of the screen and into a container. The material smaller than 9.9 mm falls through the screen onto a lower shaker/sizer screen equipped with 6.8 mm round hole screen. The material falling through the 6.8 mm screen is predominantly small inedible peanut kernels and debris. The material riding to the end of the 6.8 mm screen is usually edible-sized whole and split peanut kernels.

Zeno farm machinery https://www.shellermachine.com/ designe peanut sheller was powered by three 0.75 kW electric motors, one each for the aspiration fan, the sheller cylinder, and the eccentric mechanism for the shaker/sizers. The sheller was driven by a V-belt on an adjustable speed sheave.