1 (A machine to crush grain will usually be powered by an electrical motor that provides rational movement. You will not use an electrical motor in your model but will rather turn the handle of a crank by hand hand operated model . This rational movement should be changed into reciprocating movement so that the grain will be crushed like hitting it with a hammer. The mechanism of your hand operated model should be hosted in a strong, stable structure to prevent bit from collapsing or flipping over). so please brief tell me what the problem is and who will benefit from the use of the solution ​