Hi. I am new to electronics and arduino but learning fast (I think). I already built one small CNC with optical limit switches and steppers controlled through Arduino with grbl and easydrivers in 3 days. I also realize that this is very complex and most of my "achievements" came through stealing other people's codes and following instructions.
Now, I am building a "real" CNC 4' by 4' with real heavy duty stuff and have 1 month to finish it (evenings and weekends). I have two options for setting this thing up - 1) regular open loop with steppers and closed loop with positioning info provided back to the controllers but steppers still doing the movement through PWM.
So, the reason for my question is that I really do now want to bite more than I can chew at my level and here is the ask:
Is the positioning feedback to a controller and PWM for steppers so much more difficult over a regular step/dir control that it is not realistic for a newbee to tackle in a month? The reason why I am asking is because all DYI CNC examples are built based on step-dir but everybody says how awesome positioning feedback would be.
P.S. here is little more info about the "high-end" setup that I am contemplating: steppers driving through PWM controllers and there is an optical sensor that provides closed loop positional feedback to a controller.
The reason for considering this setup is that I have nice set of motors and PWM based controllers link to the manual . I also have couple broken plotters that have long film that, along with a optical reader, provides positioning feedback and wanted to reuse them as well. I will need to figure out how to put these two together and then find a right software to run it.