I've been somewhat successful on cutting out aluminum parts out of 1/8" aluminum, but I'm still breaking bits more than I'd like. I'm now working on getting my settings the way they should be. I'm currently using 1/8 microstep and I was wondering if I should go to 1/16 or lower it. I was also hoping that someone could check out the settings I'm using to make sure that they seem in the correct ballpark. I'm currently using the Arduino CNC Shield. Thanks!