Hi Cosmic_monkey,
I did an eight legged spider thing, should be able to use much the same method with six legs.
In sequence mode, set up 2 views. top and front.
I'll try to explain here, and if no good, can post an8 nxt time i near that computer.
We'll call his legs RFL, RML, RBL, LFL, LML, LBL. (Right Front Leg, Right Middle Leg, Right Back Leg etc...
We doing in 2 stages, (passes), and that should give a basic walk.
1st stage is to move legs fwd and back. 2nd stage is legs up and down. Leg has 2 sections + foot. The only segments, (bones), that we need worry about for now are the TOP segments. Bottom segs can be tweaked once you get a handle on it.
(the following may sound confusing, but isn't really if you read carefully and take your time)
Try to see the correlation of whats going on here.
Use the front 2 legs, Left and Right, as a guide to set the rhythm. When RFL goes fwd, LFL goes back, then LFL goes fwd, and RFL goes back, and so on.
We try a slow walk, 24frames. Make sure key is on.
Ok. Here goes.
Stage1: Make a pose on 1st frame.
In top view, move RFL forward.
If RFL moves fwd, RML will move away from it, (backwrds), and if RML moves back, then RBL moves fwd to meet RML
So, still on 1st pose, if RFL is forward, then LFL goes backwds, and if LFL is back then the LML moves fwd to meet it. And if LML moves fwd, then LBL moves backwards. (away from it).
Now make a pose on frame 12. Everything basically moves opposite.
RFL goes back, RML moves fwd to meet it, and RBL goes back
LBL moves fwd, LML moves back, and LBL moves fwd to meet it.
Go back to 1st frame, select all top legbones, go edit-> bones -> key selected. Then copy those bones,(keys), go to last frame and paste.
Also go to frame 12, select all top legbones, and again go edit-> bones -> key selected. (just to make sure those bones are keyed properly)
Cool.
Stage 2: up and down. Using top legbones only. Select bones in top view. move upwards in Front view.
Notice WHICH legs move forward, from 1st frame to frame 12. Select a fwd moving leg and go to frame 6. Raise the leg using top bone. It should lower again when it hits frame 12, coz its keyed at 'down'.
Do the same with any legs that move Forward, between frames 12-24.
Options -> loop sequence> Play.
Hopefully, by now it should be starting to look like a walk. Save a copy, and begin tweaking. ie: the bottom segments also have some back and forth, up and down movements of thier own, but mostly only slight, unless he's touching something, or 'reaching'.
Good luck, and let's know how it goes.