You picked a challenging design. At a guess I would say you will need a servo for every joint and these need to be different sizes and strength. To have it walk as a biped you will need a gyroscope like Darwin or some way of him keeping in balance like Robosapiens - rocking motion.

thx but do you know any servos that will work?

RCStartToFinish i am working on a Biped too:)

Currently i am prototyping with Plexiglasses before i buy 2mm Aluminum Sheets to cut out the parts.

I will post the progress soon on this forum.

As for the biped shown above, It will be very difficult to exact replicate what you see.

You need High Torque servos for a Biped to withstand the vertical pressure.

From the design above you can try using linear actuators to achieve something like that. Or even Reverse Kinematics. But this is a highly challenging design to follow.

Search Biped Designs in google to get a over view of how it works.

It is easy to design but it is hard to make them walk!

Bipeds are very challenging to build due to the COG and leg to body proportion.

Build up your model in a CAD program and see how it look and where you can modify before you do anything else:)

Good luck and nice choice of project to choose!

Thank You, but two problems...

1. CAD doesn't work on my computer.

2. I was hoping that there would be same degrees of freedom as a human.

Lets see...

A human has

Head - pan and tilt 2dof Hip -pan and tilt and yaw 3 dof Arms - pan, tilt and yaw 3 dof x 2 arms Elbow- pan and tilt 2dof x 2 elbow Hands - pan tilt and yaw 3 dof x 2 hands Grab - 1dof x 2 hands Thigh - pan,tilt and yaw 3 dof x 2 legs Knee- Pand tilt and yaw 3 dof x 2 knees Ankle- pan tilt and yaw 3 dof x 2 ankle. Feet - 1 dof x 2 feet

In total a human has 43 degrees of freedom. Maybe more. The most advanced biped can only achieve 28 Dof. After that the biped gets too heavy or useless DOF is added.

Try to build Something with lower DOF first then slowly work your way up.

Using acutators you may achieve your goal of building something similar as above. But do more research on acutators first. And they are not cheap.

Kudos:)

Ok thanks, Another project i'm thinking about working on is an exoskeleton like in the picture below. Linear actutors are too slow and im not sure how to do pneumatic any ideas? I would like it to be battery powered.

www.google.com/imgres?q=exoskeleton&um=1&hl=en&sa=N&rlz=1C1LENN_enUS478US478&biw=1511&bih=714&tbm=isch&tbnid=mTFURXHyw01-yM:&imgrefurl=http://www.thefutureisawesome.com/category/exoskeleton/&docid=MFB8pJpM0MUHfM&imgurl=http://www.thefutureisawesome.com/wp-content/uploads/2008/04/xos-exoskeleton.jpg&w=408&h=500&ei=96IWUObkA4m6rQGj14H4DQ&zoom=1&iact=hc&vpx=444&vpy=318&dur=483&hovh=248&hovw=202&tx=124&ty=144&sig=102519520110968498039&page=1&tbnh=156&tbnw=127&start=0&ndsp=25&ved=1t:429,r:10,s:0,i:172

Or like this