Hi
I am also looking for plugin for usb.
Has any one made it?
Please guide me with this.
About a year ago I was also interested in finding a USB plugin for Mach3 and had no success in my search so I decided to make one myself using VS2013 and PIC microcontroller. After some months working on it on my free time I moved from PIC to arduino as it is less time consuming and some days ago I finally got my CNC working with the system I created. You can see the first test here:
https://www.youtube.com/watch?v=O385I6P_o8oAs you can see the motors do not move perfectly because I used DC motors with low resolution encoders (16 steps per revolution) and the control is based on a PID algorithm so it will always have some error between desired position and current position (about 5 steps) but it has an advantage: it will never lose steps permanently as the PID algorithm is constantly correcting the error.
As I said here
http://www.machsupport.com/forum/index.php/topic,27232.0.html I have the intention to share the plugin and the firmware as it would be helpful for some hobbyst who is not ready to buy a commercial motion controller.
I am working on some improvements now. Shortly I will post another video milling something and if there is sufficient interest I will release the pluging.