Octopod Chassis

True!

This must change! I think it would look wickedly cool with the CH3-R style legs.

Hey, Jim, can I model the CH3-R legs, and Little Grip/Little Grip Attachment kit?

I’m almost done with the A4WD1 chassis models. I just have to put the 3 mm press nuts into both parts. I need to model the decks also.

8-Dale

Ya know if you put an arm on that thing, a pan+tilt for a sensor array, and quicksters LPA mod on the two front legs and you might actually use all 32 channels on an SSC-32. :open_mouth:

Heh heh, for sure! I could use all 32 channels of an SSC-32 real easy on an eight legged freak. Carl’s mandible/leg LPA modification would be mandatory! :smiley:

8-Dale

:open_mouth: Yup 8)

I barely had time to build it. This required me to disassemble two bots, which I rarely do. So it took a long time to build.

Laurent is working on the Atom Pro Power Pod as soon as the current RIOS update is completed. It is in beta now. He’s working on the manual.

The legs can be assembled in several different ways, and attached to the chassis in lots of different ways as well. I just chose our traditional methodology out of habit. The holes on the ASB-04 do provide for centered alignment. It’s not perfectly centered, but it’s very close. This was done as a design tradeoff as it adds a lot of flexibility doing it the way we did. I could have went with short “C” brackets, but would have lost range with this leg style. Another method would be to use the A leg design, but flip the horizontal servo.

Thanks, I appreciate it. 8)

Will the new Power Pod support the Phoenix?

I haven’t had time to bend his ear on this. I suspect that it may have trouble as PowerPod currently works with inline or round chassis, but oval chassis doesn’t really fit into either category. We will have a solution, just not sure if it will be a Power Pod solution. :wink:

Yes, I guessed you “borrowed” legs from another 'bot ('bots).

Good to hear.

Yes! You have considerable freedom in your SES leg designs. The ASB-04 can be bolted on and give a centered servo horn? I like that, it would be an interesting leg to pursue.

Long ‘C’ brackets; so that’s why the leg looks a little long! I got it. Must be nice to have an unlimited supply of brackets to play with!

The ‘A’ leg has some advantages. It keeps the HipV (knee) servo at right angles to the body (purely radial), and reduces the leg’s “swing width” (allows it to swing wider in a confined space). I may go to that on my small body 'Bot.

I’ve wanted the LPA joint in the front two joints since I found/posted a link to a hexapod with the front two legs being used as jaws, Carl beat me to it! That will undoubtedly require more swing width as well.

Can an LPA joint in this application get by with a smaller servo then the '475? I’m outta servos!

Alan KM6VV

More like disassembled a biped and a hexapod. The biped was only used for pictures with the 475 servos.

Yes it’s within 60 thousandths of perfectly centered. Like I said, it was a design tradoff. It allows shifting the ASB-04 up and down and still have three of the four small holes line up for hardware.

Who has time to play. :frowning: We are pretty busy this time of the year. lol

Yup… :smiley:

I’m not sure. I would consider the 475 as the minimum for this, but it may be ok with a 422…

Hi!

Jim, what is the radius of your Webber octapod (centre of body to axis of coxa) in cm?

I have been working with a PEP version for a octapod. And it’s almost finished. Has anyone been thinking of a gait method? I guess there is very many altenative gait methods. Here is a screenshoot of the Oxyopus PEP version with a round Webber body:

http://i214.photobucket.com/albums/cc6/ZentaOlbaid/Oxyopus.jpg

About gait method for a octapod I have found this: oricomtech.com/projects/leg-time.htm#Oct2

Maybe Alan KM6VV or Linuxguy has some ideas about different walking gaits for a octapod? :wink:

the fact that that is an excel spreadsheet is just… scary. :smiley:

Hi Kåre! (Zenta)

I have an Octapod body design underway as well.

My initial plans are just to get it walking with a tetrapod gait, i.e., move 4 legs instead of 3 legs (tripod gait) as we do now.

The apparently desired way is to keep MORE legs in contact with the ground at all times, so this will have to be altered somewhat.

Look for " Spider-Robot 8-Leg Cooperative Walking …" PDF paper for some initial ideas. It’s also in the files of the IK yahoo list:

tech.groups.yahoo.com/group/HexapodRobotIK/files/Robot%20Papers/

HAY! That’s great that you’re already working on a PEP for round octapods!

I hope you’ve got the ability to have non-symmetrical leg angles and varying leg lengths! I seem to recall that you could.

My Octapod body is looking more like this one (I’ve scaled up the size a little):

tech.ph.groups.yahoo.com/group/HexapodRobotIK/photos/view/3837?b=1

Found in the Octapod folder also on the IK yahoo list, and I believe in another octapod thread here.

I made a folder for your pictures, if you’d like to add a few, or I’d be happy to add them for you.

But first I’ve got to get the leg parts, servos, and the new body plates cut. (I’m cutting 10.5" octagon Deck plates for Dale’s bot on my little Sherline mill w/ a 8" x 4" working envelope). I intend to apply this recently perfected (?) technique to make my 10" “Organic” (Biomimetic?) octapod body.

Oricomtech’s paper is a good starting place as well. A ripple gait would be very entertaining!

My oldest son Andre (EE) is bringing his friends over to see my current hexapod. The latest time after a concert at 00:30 AM!

Alan KM6VV

I could turn W.A.L.T.E.R. into a hybrid (quadrapod, hexapod, OR octapod) with the new decks… :slight_smile: With the new decks, I have the option of mounting legs at the points or on the flats. :smiley: I have no doubt his motors can move that much weight, considering I have him throttled back to about 1/3 maximum speed right now.

I’ve thought a bit about octapod gaits, but not for the round variety. It would take me a long time to get enough servos to build even a hexapod. I haven’t even filled The BiPod’s brackets with servos yet, but there are probably enough brackets there for at least three legs.

It would be interesting to come up with a gait for a round octapod such that it wouldn’t trip over itself. :wink: I see no reason why it could not use a modified round hexapod gait (which would allow it to use the “front” pair of legs for a gripper like Carl designed, as well as adding in the additional pair of legs for walking/climbing.

Yep! I will be able to do MUCH more with W.A.L.T.E.R. once I get the new decks. I am anxious to find out how good a design job I did. Now that I know I can export usable DXF files from the 2D drawings I create from my 3D models, I will be able to do a lot more.

I love Oricomtech! They also make the ooBot board I want to use for PICs (18F4620, 18F4680, and 18F4685). Dan (the ownder) is very helpful. :slight_smile:

8-Dale

34.45cm

Cool! 8)

Six down and two up would allow a pretty hefty payload. :stuck_out_tongue:

Hi,

Alan, I have observed your great collection of documents at your yahoo group. Very useful! I also think a sort of ripple gait would be cool.

Jim, I’m guessing the radius is 34,45/2 cm = 17,2cm :wink:

Doh!

So you wanted the other radius. :unamused:

Sorry bout that. lol

Lol, An aoctopod chasis would be a great idea for Big loads, so it could be made a car and a waqlking robot… It would be nice!

A full sized walking octapod has already been done and proven to work. There is a video on YouTube, but I don’t have the link. The link was posted in another thread in Genreal Discussion I believe.

8-Dale

I agree, if anyone was going to make a Hybrid (hexapod/rover) this would be the perfect body to do so IMO becuase it can take the load of the wheels and the legs.

I’ve designed the new decks for W.A.L.T.E.R. so legs can easily be added if I choose to do that. :slight_smile: I think I might want to have aluminum decks for a W.A.L.T.E.R. hybrid though. The new decks just happen to be octagonal shaped with wheels centered and completely within the diameter of the body. :wink:

8-Dale

yeah, im not so sure acrylic would be good enough to hold the weight as well as you would like. Than Again, im not sure exactly what material you are using and its thickness.