lasercut hands attached to motors translate the rotary movement into linear
download cad file here
Rotation to translation mechanism 1, http://www.youtube.com/watch?v=wtn_T-WMDR4
Rotation to translation mechanism 2, http://www.youtube.com/watch?v=kOyRtiDRZ_o&feature=relmfu
mechanisms&automata (1st one) http://www.youtube.com/watch?feature=endscreen&NR=1&v=0gjyVqwrf3E