A pictured step-by-step for how to engrave on an alumninum water bottle:
http://www.flickr.com/photos/82047188@N05/sets/72157631339568586/
1) Have your design ready and saved as a .pdf file type.
2) Press the FOCUS button on the Epilog laser cutter and press the DOWN button to lower the laser bed all the way to the bottom.
3) TURN THE EPILOG LASER CUTTER OFF! The switch is located on the left near the back.
4) Remove the grating and the central cross support.
5) Place the rotary adaptor into the bottom of the laser cutter. Make sure it is set into the holes.