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Praying Mantis Robot Project!

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Posted: 2011-12-31 18:24 
Hi everyone! I've pretty much finished with my other robot project (Nexus - The Spider Robot) for the time being (but I'm still making small tweaks here and there) so I thought that I might as well move onto a new robot and this time I'm going to (attempt to) build a "Praying Mantis Robot"!

I've got exams during most of the second half of January so I won't really be making anything at the moment but after these exams, I'll have a lot of spare time for about 3-4 months so the building (and prototyping) will begin after Jan. 25th. I'll upload some designs for the robot over the next few days/weeks to let everyone see what it'll sort of look like. (My CAD skills are terrible so it would probably take me a while to draw up nice looking 3D models of the robot so for the time being you'll have to put up with my rough drawings - sorry :cry:).

Here's what I've done so far:


Attachment:
Mantis Robot Leg Design - Rough.jpg
Mantis Robot Leg Design - Rough.jpg [ 1.6 MiB | Viewed 3846 times ]

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Posted: 2012-01-18 13:59 
Hi everyone! I had some spare time so I've whipped together this design for the bottom half of the praying mantis robot - I'm still working on the torso, the arms and the head. Sorry about the colour in the photo but my CAD package didn't want to export in a photographic format so I had to export it as a different CAD file and then open it up in eDrawings Viewer and then save it as a .png from that! :roll:

Anyway, ENJOY! I'll post some more designs and stuff soon (just 1 more week of exams and then freedom for a few months). :mrgreen:


Attachment:
Praying Mantis Robot Design - Bottom Half.png
Praying Mantis Robot Design - Bottom Half.png [ 17.74 KiB | Viewed 3744 times ]

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Posted: 2012-02-01 13:39 
OK! Here we go!
I've finally managed to get all the leg brackets cut out and I'm working on a really awesome looking body (for the robot of course :wink:). I'm currently not sure if I should convert from Praying Mantis to some kind of Mech but I'll have to see as I go along :mrgreen:. Here are some photos showing the new feet and leg design - ENJOY!


Attachment:
New Robot Leg.jpg
New Robot Leg.jpg [ 1.72 MiB | Viewed 3668 times ]
Attachment:
File comment: I was going for a anime robot theme here so I decided to make some extra "spikes" which I could then bend backwards to give the desired look.
New Foot Brackets.jpg
New Foot Brackets.jpg [ 1.13 MiB | Viewed 3668 times ]

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Posted: 2012-02-04 15:18 
Again nice work with the acrylic. it would be cool if you could cut parts to replicate the leg like this?
you could use the Tarsus to give you feedback control for terrain adaptive response. :wink:

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Posted: 2012-02-04 16:01 
Thanks! :mrgreen:
I think I might attempt to make a leg like that as a one-off just to see how it would work - it would look pretty cool! 8)

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Posted: 2012-02-04 17:27 
akdabaous wrote:
Thanks! :mrgreen:
I think I might attempt to make a leg like that as a one-off just to see how it would work - it would look pretty cool! 8)

Wouldn't at least two of them walk better? :twisted:

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Posted: 2012-02-04 17:40 
I'm not professional enough to attempt a 5 D.O.F leg style robot and it would cost a fair amount of money for servos - but why not, I'll try with two for the back legs; should be very interesting! :mrgreen:

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Posted: 2012-02-04 22:24 
akdabaous wrote:
I'm not professional enough to attempt a 5 D.O.F leg style robot and it would cost a fair amount of money for servos - but why not, I'll try with two for the back legs; should be very interesting! :mrgreen:


The leg i posted is one of two front legs or arms.


As this is a hexapod you could design the rear and middle legs as 3dof and keeping in style of the legs you have already made, and by having the electronics in the back like Zenta's A-Pod you could allow the two front arms to hang off the ground as shown. mantis's do also use their front legs for walking so getting it to walk wouldnt be a problem.

you could also make it a 3dof by combining some of the segments. and just used the picture as a template to work from? just an idea. :wink:

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Posted: 2012-02-04 22:27 
this video is quite frustrating at the start but it does get going.. lol

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Posted: 2012-02-05 03:45 
innerbreed wrote:
this video is quite frustrating at the start but it does get going.. lol

WOW, INNERBREED! How did you ever build such a realistic mantis hexapod and get it to run on such hair-thin legs under children's voice commands? :shock:

My hat is off to you, sir! Will Robot Dude be offering this as a kit anytime soon? :P

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Posted: 2012-02-05 05:16 
Thanks for interesting info. I'm sorry about thinking the arms were legs :oops:. That clarification has given me some more ideas! :mrgreen:

By keeping the legs the same (3 D.O.F) adding the arms (with 5 D.O.F) should be fine because they were going to have 4 D.O.F anyway - I thought that the image was of a leg and that put me off making 4 5 D.O.F legs as well as arms. :mrgreen:

The video is perfect for modelling the motion - thanks again! :D
This has given me some more designs to work on which I'll post this afternoon/evening. 8)

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Posted: 2012-02-07 15:19 
Sorry about not posting the designs - I haven't had much time to actually do them. :oops:
However, I managed to make my PCB for the Atom Pro 40 which I have using the good old-fashioned way - photo-resist board, developer solution and etching tank!







Anyway, here's the PCB! :mrgreen:

Attachment:
PCB for Atom Pro 40.jpg
PCB for Atom Pro 40.jpg [ 1.26 MiB | Viewed 3548 times ]

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Posted: 2012-02-07 16:03 
Also I would just like to say that the photos of the photo-resist board, developing solution and etching tank were taken off Google images and I would also like to share the name of the PCB - I call it the B.A.O.U.S Board :mrgreen: (sorry Lynxmotion for stealing the name idea):

Basic
Atom
Oooh-very fancy board
Used
for
Stuff

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Posted: 2012-02-07 16:05 
You did your own AtomPro?

That's not your PCB gear?

Alan KM6VV

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Posted: 2012-02-07 16:13 
No, sorry - I should have been clearer. :oops:
I made my own circuit board for an Atom Pro 40 pin which I have and I forgot to take pictures of the photo-resist board, developing solution and etching tank; all that stuff is at my college so I just found some photos on Google images to represent each thing.

Hope this cleared up some things! :mrgreen:

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