I am ready to start building my First cnc and well I have to figure out the electronics. I have looked around and read a few things and well I just dont know what to use I want to keep the cost down but I will pay extra for reliability and quality performance. I am unsure as to what motors and drivers to use could some one explain bipolar motor vs unipolar and what about boards. From reading and asking a few questions most people tell me to get 200 oz/in motors the cnc I plan to build is basiclly a modified and beefed up JGRO ( to start). Here are the motors I was thinking about the small nema 23 http://www.homeshopcnc.com/page3.html I was thinking about building the ss3977 board on pminmo website as the controllers and the 4 axis pc interface board for the BOB but I dont know if bipolar or unipolar is better what about Opto Isolation do I need this? Also I noticed that the current rating for the as3977 is only 2.5a @35v and the motors I posted are 2.8a does it matter or should I use the Picstep by alan on pminmo website and I still need a BOB the more I look the more I get confussed .
Thank You to all who contribute.