Other than the manual method, the implementation of a mechanical system in the shelling process is encouraged since a motorised machine can be designed to have a higher capacity and thus reduce the requirement for manual labour. Table 2 shows that most of the commercialised shelling machines in the Jatropha biodiesel industry produce whole seeds from whole fruits by removing the shells. The whole seeds or broken seeds are normally produced without removing the husks (the outer coating of the seeds). The steps to separate the shells from the whole seeds can be carried out by using a screen or mesh and a blower which uses the difference in terms of size and density as the basis to achieve separation. The other separation devices which might be useful for this application include a spiral separator, an inclined belt separator, a vibrator separator, a roll mill and an aspirator since the shells and seeds are also different in terms of roundness and mass according to the physical properties measured by Pradhan et al. [32]