What about three wheel design. Two large driven wheels that are thin in width (tight turning radius, mininal drag for making marks) and then a third "castor" type wheel that just exists for support. This way you'd be able to turn on the spot and thin wheels are best for carpet
Other wise you could put rubber on the tracks, shorten the length of the tracks themselves and make sure the software doesn't try to turn too far in one go (have it detect carpet then go back and forth to complete the turn in many more but individually smaller turns) thus saving the carpet but allowing strength in the open field.
Feel free to drop some Texan humour on us anytime! No nasty moderators here
Actually the Terminator project is not mine but Rod's (username: Bones). He is the man behind such a great project. IF you want to ask him any direct questions you can just pm him here in this forum.
You idea of modifying cheap servos to include feedback is great! It would be a Godsend to all robot builders!. Now if we had pressure sensors on the ends too that would be awesome.
As for the air muscles,I know that Rod is also lamenting the fact the control valves cost so much. If I remember clearly, I think he was looking into machining them himself. I'm sure he'll post here to inform us all of what he intends.
Yeah, Digikey and Mouser *can* deliver to Australia but they want to charge huge amounts for postage. I'm not actually sure why, I send and receive stuff all the time to the States and postage doesn't have to be too bad. Thus parts can be a bit of a pain to source easily. With Australia being about as large is continental US but with only 20 million people in it, there just isn't enough concentration of population in any one place for big electronics stores. Most of my parts are bought mail-order from Asia directly.
Oh and when you do get your giant hexapod built, Steve, make sure you get a mannequin, write "clever coder" on it and take a picture of the hexapod crushing the mannequin
I'm sure even the non-english speaking background users of AVR freaks will get it
Which way do the toilets flush? Um, downwards mostly ? Next time I have a kitchen sink full of water I'll make sure I note which way it drains just to make sure I'm still in the Southern Hemisphere
Anyway, welcome aboard Steve and just because your American we won't hold that against you here, (much ) just joking ;D