Hi, There is a good option for building catipilar track base.=20 Use timing belt inside out so the teeth are the tred. Some belts=20 have a rubber backing that helps with power transfer from the drive. If the environment for the base to run on is clean then the belts could=20 be driven from the touthed side. This is what I am planning for a K9 (DrWho) type robot dog. regards Peter W. >>> Dan Michaels 11/08 12:40 PM >>> Tom Handley wrote: > I'm also hacking a Radio Shack R/C car to turn it into a robot. ......... Tom, I have also been intrigued by this idea for a couple of years - something for my "spare" time [which is why it hasn't got started yet]. Most of the robo-hacks I have run across on the web have horrendously poor/flimsy mechanical platforms - like the Parallax thingies. I am looking at this year's R/C Hummers as a sturdy platform - something low-slung, slow-moving, and wide-track with large tires, plus a wide flat body to mount microelectronics on [PIC, of course]. Do you have any good links to successful R/C car --> robot hacks? I haven't had much luck in finding these. best regards, - dan michaels =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu=20 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu