Hello!! I know that I am new to this hobby, but have been looking into different drives for my cnc when I get around to building it. A couple of things come to mind. James site states that you should only use 3 or 4 volts over your rated motor voltage, and to only use more voltage if you absolutly need speed. In doing so you need large heatsinks in addition to the bracket of aluminum that is bolted to the transistors. Also he states that the transistors are used to dissipate extra heat that will not in turn heat up your motors and burn them up. You mentioned "stall at the slightest missalignment". Are your motors big enough? Do you have excessive play or runout? What rate are you trying to run at? Dont get me wrong, I am just throwing these things out in order to understand because I am interseted in these drives and want to know their deficencies. |