Biped project

I don't think I can... for me, this appears as just a long page of
gibberish.  Did you intend that to be some sort of viewable file?

Try this link(it has the extension .jpg) Some browsers have trouble
without it:

http://members.aol.com/castvee8/1.jpg

Thats not working either-sorry-Will look into the problem. My
apologies.

Mark

Ok-This link with the extension seems to be working:

http://members.aol.com/castvee8/2.jpg

Mark

That's very neat.  I'd love more detail on how you make the resin parts.

Also, you should consider using robotics servos for the joints.  They
can be a bit expensive, but not too bad -- an AX-12+ is $45 (including
some handy brackets), and offers 16.5 kg cm of torque, which is a lot.  
It's very hard to come up with your own motors, feedback sensors, and
electronics to do what these servos do, with the same speed and
strength, for less money.

That may not be strong enough for a 4-foot-tall robot though.  If
necessary, you can go to truly monstrous ones like the DX-117, with 37
kg cm of torque.  That's going to set you back a lot more money, though
(like $150-$200, I think).

You might be able to get by with something like the AX-12+ for most of
the joints, and just double it up for critical ones like the knee.  That
gives you twice the speed and torque of a single servo, and is a pretty
common trick on the Robo-One circuit.  (Though your robot is a giant
compared to any of them!)

Best,
- Joe

I got kinda hung up on using steppers in the eighties-The ones on this
machine are a buck each(on sale),regular 2.95. I can run the arms fast-
but the legs need to move slower for now as I am using no balance
system electronics. Right now it utilizes GOG(Grace of God) and
carefull tinkering with center of gravity.Servos are do-able! I
suppose some day I will have to get with the program.As is the whole
dern thing only costed about 300$ to get up and
well.....er....running.
 I made molds for each of the joint parts so I can make what I need on
demand.
I hate tearing something apart to modify it, this way I can just slap
another limb together and make changes. I used mainly gearsets from
american science and surplus(4 gear set 1.95 each) fro the drives.
The resin parts I made from wood patterns-I coat them with about 40
layers of latex(letting dry between each coat). When the
latex(available online,Google for environmental tech products) is dry,
you pull the wood patttern out, and support the mold on the sides and
fill with resin. You can use fiberglass resin
from the auto store about 30$ a gallon. Then drill,tap, sand and paint
to suit.
Higher quality resins can be had in epoxy or urethanes.
 Its obvious I need to join a timewasters ten step program. But the
fun and entertainment value is priceless. I just got tired of "box"
robots with wheels,tracks etc. I had NO idea............

Joe-Thanks for the advice! you have me thinking.....

Mark

    --Interesting stuff; here's a link to a little 'food for thought':
http://anybots.com/

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