Octopod Chassis

Reading my mind can be dangerious… :slight_smile:

8-Dale

GHM motor mounts with the same dimensions are on my short list. :wink:

You go, Jim! :smiley:

I am also envisioning a four wheeled robot where the other sides could be used to attach other things, such as a pair of arms at the front. I think the four wheeled robot would require some special motor mounts to use the GHM series motors. I have an idea for this already.

I have also been looking at omni-wheels, mostly for the new casters I need for W.A.L.T.E.R. with the new body decks I am having cut soon.

An eight wheeled onmi-bot, like evolution mentioned and I had thought off would be very cool also. This could open up a whole new market segment for Lynxmotion and the SES. You could actually make a four wheeled, six wheeled, or eight wheeled (plus variations of each) rover using omni-wheels attached to the new octagonal chassis set.

I see many possibilities for this, Jim. :smiley:

Now I need to design a GHM series motor mount that allows the motor to be mounted vertically and translate the motion to a horizontal shaft. This is for my HexRover and Walk 'N Roll.

8-Dale

The file for the bracket is enroute. I need to send you a DXF of the top and botttom panels. Thanks!

Do I correctly remember something being said about a GHM motor mount with an SES pattern also on it? Is that what you are referring to here?

Also is there a file for the ACB-01 bracket kicking around yet, and if not can I get you to e-mail me a .dxf or something I can make a model in Rhino with?

:blush: Sorry, missed that. I assumed it was for multi-leg robots since it was posted on this part of the forum instead of the SES or the rover part. My bad.

Got them, thanks. I can import the DXF, but I don’t get any dimensions and can’t do anything with it. I’ll have to check and see if I am missing something about DXF imports - this is a new thing for me.

I was able to separate the top and bottom sections into separate drawings, so that is good.

8-Dale

Yes I have mentioned it, but I haven’t been able to make them materialize yet. In my defense I have had some bigger issues to deal with. I keep plugging away. I’ll get them done.

I will send you whatever files you need.

Was not pushing, just asking if these were one and the same bracket. Cool beans on the files. :wink:

The DXF was sent because I don’t have it dimensioned. The part is 9.062" wide if you have it sized correctly.

It is primarily a chassis for an 8 leg robot. You said “What is gained by having a leg on the front and on the back.” I’m saying there isn’t a leg centered in the front and the rear, they are evenly spaced around the chassis, but there are 4 on each side.

One thing that might be considered for more varied or “realistic” legs is using two (or more) SIZES of legs. Similar in construction, but have one pair of legs perhaps 1.5 times the total “length” of the other legs.

And instead of equally spaced legs (I know, not relevant for this 'bot), space them at 40, 70, 115, 145, 215, 245, 290 and 320. So the ‘0’ leg would be at 40 instead of 22.5, and the ‘8’ leg would be at 320 instead of 337.5 (both of the rear, bigger/longer legs). This gives the “spider” 'bot a realistic “rakish” look; in my opinion.

These are numbers from a preliminary look at a real spider drawing (pix) that I found interesting. OK, it’s not 7 segments per leg, but could make for an interesting 'bot.

Possibly the proportioning could be realized just by making the ‘C’ brackets longer (we have some!). AND/OR possibly providing some complementary “spider” tibias that were a little shorter.

This would, of course affect the code! Tables of leg angles would need to be used, and tables for at least one leg part (Tibia or Femur) would be needed as well (these might be just if-then-else statements). No big deal. Putting leg angles (pre-calculated sin/cos values) would actually make the calculations faster!

http://www.marconettengineering.com/Spiderlegdiagram.jpg

http://www.marconettengineering.com/SpiderLegs1.jpg

Alan KM6VV

I have an idea about this… I’ll tell you about it privately. :slight_smile:

8-Dale

HI Dale,

Less then 3 minutes! What a fantastic response time!

Alan KM6VV

I watch these forums like a hawk. :slight_smile: I don’t miss much here.

8-Dale

Hokay, for you power users out there… For those of you who proudly say, “6 legs are just not enough!” We have created this Octopod, code name Webber! :smiley: Get it, 8 legs, Dale Webber loves Octopods, spiders make webs, Webber, get it… :unamused: :slight_smile: 8)

No, Actually, I don’t get it.

That thing is wicked though. Do you got any vids?

I have created a 3D model of two decks using the angles you provided for leg spacing. :smiley: I will update my 3D models if the angles change. I’ve also created the 3D model of the entire body using both decks with 1 7/8" long standoffs. :slight_smile: It looks wickedly cool. :smiley:

8-Dale

That’s a LOTTA LEGS!

Ah, but Dale doesn’t have a LEGGED 'BOT! He needs to remedy that, in my opinion. ;>)

Nice to see the new body with legs! I doubt if it has been ran with 'bot code, because the IK code from LM so far has not been written for 8 legs. Nor do I see an Atom 'Bot Board on board. :>(

I believe I could drive it with my 'Bot code, however. I just don’t have the additional legs yet (or an 8-legged body fabricated yet)!

It won’t be too hard to convert the current LM code to 8 legs. Perhaps it’s already a project underway in the secret bat (spider?) caves of LM.

That’s the obvious (tried and true) way of mounting the legs, however I thought the “servo horn pattern” on the side pieces suggested that it might have been built by bolting up ABS-04 brackets to the body pieces. Although the ABS-04 brackets have a pair of hole patterns, rather then a centered pattern, so the legs probably wouldn’t come out centered on the facets of the body. I guess you have to have the parts on hand to play with, or experience.

The new 'bot looks good!

Alan KM6VV

Woot! :smiley::smiley:

Now I must build one! :wink:

8-Dale