Why don't​ you just buy an electric burrr grinder such as:

https://www.amazon.com/gp/aw/d/B0161Q2RUM/ref=mp_s_a_1_2?ie=UTF8&qid=1494669939&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=electric+burr+grinder&dpPl=1&dpID=41VPWVS%2BlWL&ref=plSrch

It would save you a lot of time and effort, possibly cheaper in the end.