Sorry, I've been sick.
Take a look at this excellent guide. It's a complete build a Prusi I3 from scratch blog. This page has information on adjusting the drivers.
You might want to read through all of it, it talks about everything I can think of, including endstops, firmware, calibration.
Edited 1 time(s). Last edit at 02/07/2016 01:34AM by Paul Wanamaker.