T-Hex, a Mech inspired 6x4 DOF hexapod

Thanks for your comment tnay!

Thanks J. glad to see your back! And I’m glad you liked it too. Yeah I also like that pose showed in the picture. T-Hex also berform best from that walking height too. I hope to post a teaser video soon.

Hi!

I grabbed my mobile phone today and did a short video of T-Hex doing some movements. If you pay attention to how the tars joint move you’ll get a little picture of how the IK algorithm works.

Sorry for the bad quality video, hopefully I’ll post something better later.

Hi Zenta,

I receive an error when I try to play it :frowning:

Kurt

great work. the rotations for the tars work really well.
still impressing me with your work.

[size=85]please get a new camera dude. [/size] :wink:

I’m sorry but I’m not sure how to help you, does anyone else have a problem with this too?
You could try the direct link to youtube: youtube.com/watch?v=6tR0TDsWCls

Thanks!
Didn’t have time for doing a good video with my sony handycam, sorry for the poor mobile video. You get the picture of how it moves though.

Works now! Look like it is moving very well now. Great work

Kurt

and brilliantly at that. :wink:
cant wait to see more. welldone.

It moves fantastic from what I can see. I don’t know how much more you can improve this. You said you were still working on the code but I don’t see any flaws.

The extra DOF seems to give the hex the ability to really stand tall!

Thanks for that video!

Hi Zenta,

Really need! The extra DOF gives it not only more ground clearance but it also gives it an extra touch. I like it how the tars tay at a horizontal angle when doing body rotation and when doing shifting the tars move in line with the leg to give it his extra stretch.

Like I said on the youtube channel. The legs make me thing off a gorrilla moving his massive arms!

Amazing job! Can’t wait to see more!!

Xan

That’s simply the best! It doesn’t look like it’s having any difficulty carrying the extra weight of the extra DOF servos at all! Do you have the current draw it’s using? Nice work!

I believe the accepted scale for mech warfare is 1:24 scale. You need to get little figure of a pilot to put inside the cockpit. Again nice work!

Thanks everyone for all the positive feedbacks about the (crappy quality) video. I didn’t have time for making a better quality video this weekend. My two kids got the varicella with fever and red spots all over… :laughing: And our washing machine broke down… :imp: And later this day my wife called me and said the diswasher machine was full of wather after finishing washing… :unamused:

So not much time for robotics or video editing.

Thanks Jim! The servo seem to work pretty well. I believe the reason is that most of the additional weight are distrubted all over the six legs. My 10 amp fuse are broke on my Fluke, so I’ll have to replace it for measuring the current draw, hopefully it doesn’t go over 10 amps.

Yeah! And a minigun on the little 2DOF head and some heavy guns on the top…

A FLAME THROWER! YEEEEAH!

:laughing:
Thats the easiest part, just add a relay for shorting the LiPo and you got a real flame thrower! :smiling_imp:

I’ve just replaced the 15 amp fuse on my Fluke multimeter. All electronics, SSC32, BB2, RC receiver and servos are powered from one LiPo, and I measured the current drawn directly from the battery.
And this is the result I got:

Standing down with both body and all legs touching the ground: ~1 Amps
Standing with body lifted, all legs down: ~2 Amps
Current drawn while raising body upwards: ~4 Amps
Walking ripple gait: ~3,3 Amps
Walking tripod gait: 3,3 - 4 Amps

To be honest the result surprised me, I was expecting a much higher current draw. When doing many movements at one time (like fast body rotations) the current raised to over 5 amps. And adding more load/weight to the body also increased the current drawn very fast. I wasn’t able to measure the current when doing very fast walking though.

If you are interested I could post a setup picture of how I did the measuring.
Anyway, I’m pretty sure the result are correct.

Wow that is surprising. I’m interested in seeing the set up. Now I need to know why… lol

Here you got a picture of T-Hex standing while measuring the total current draw:

As you can see its 1,59 amps at that moment, the value vary a bit though.

Looks nice! Too bad you can’t black-anodize the chassis as well!

Alan KM6VV
I know, wait for Jim to get the parts made.

He can actually.

I have seen how-to’s on the net using black die, the kind you use for your clothes and baking it in the solution in the oven. The color is a little off so I would experiment first. They sell professional dies that work a little better. Anyway, the option is out there.

Yes, I’ve seen those kits, and posted on them before. Would look good!

Alan KM6VV