I wanted to share this early design of an ATC for knee mill that I did several years ago. There are several things that could be done to improve the design for speed, but the basic concept is there. So I hope this might help someone thinking of doing something like this.
Keep in mind, this is a functioning prototype only.
Thanks,
JH
http://www.youtube.com/v/vsC-10q3wv0&hl=en&fs=1&rel=0&color1=0x006699&color2=0x54abd6&border=1
http://www.youtube.com/v/I_4T1TmF6B8&hl=en&fs=1&rel=0&color1=0x006699&color2=0x54abd6&border=1