Yes a very nice render. Thanks for the pm. I agree with zenta. A pointed foot will be required for 3dof. The tibia angle will change when walking. Power switch holes is also a good idea as mentioned. Looks like you have left enough room for coxa movement and i also see you have allowed for a head servo. Need to make sure there is enough room for it to pan. Many of us find battery placement a pain so make sure you allow for that too. Overall, a nice chassis.
Nice idea to add hole for switch, i ain’t think about that myself.
The Legs design will not be like that, i only assembled the leg to see what it look like with something.
I have a set of Femur and Tibia from a Micromagic MSR-H01 that i have buy used from “innerbreed”.
Alan: I do this in SolidWork 2009, is it ok for you ? I have no problem posting the CAD drawing …
As powering option i think i will use a small BEC with a 460mah 2 cells lipo for the brain, and i have a big BEC and bigger Lipo… something like a 2300mah or 3000…
SolidWorks is fine. I’d suggest exporting a JPG that you can post here, and add some simple dimensions to show width and length, etc.
One other thing that I think all of us have been overlooking. With the higher currents, we REALLY should employ a fuse or small breaker in the power wiring, as close to the battery as practical.
don’t want fires! Has anyone ever seen shorting wiring start to glow RED on a 'bot? don’t ask.
145mm (5.7") would be close to my minimum of 6" (I’m 6"x8"), so I’d think it’d be OK. but 120mm? I’d want to mock up (CAD or drawing) the width of your servos/brackets, and see how they “swing” within the confines of your chassis (frame).
Mock it up with stiff cardboard! and see how well the legs swing!
You can always just try it, and then set the limits of the leg swing so that you don’t crash. ;>)
120 will be ok. I have build chassis with 80 that work fine. 120 would be about the magic number. It will allow for the amount of movement needed for the leg to rotate round.
Of course, it depends on how the servos are mounted, I suppose. 120 (4.7") would make a compact chassis! I’m usually limited to what I can machine on my mill conveniently (I make a fixture and flip over the stock to double my envelope).
Right now, all my “chassis” (decks) are 5" round disks! (wheeled 'bot MicroMOOSE).
