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Post Launch

posted Aug 18, 2011, 12:20 AM by Jonathan Dowdall
It has been a couple of weeks now since the public launch of the site, and the feedback from the Prodos Thingiverse page has been great, so I thought I'd capture a bit of it here.

Tillin9 
Might want to look at the Lynxmotion Biped Scout: http://www.lynxmotion.com/c-67-scout.aspx I always their SES (Servo Erector Set) could be efficiently 3D printed instead of made from aluminum.  
 
Would love to see it really walk with something like HSR-5590TGs.
Saturday, August 06, 2011, 18:48:12
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jdow 
That's a cool robot ... and at under $200 it is a good value. Based on the close up pictures, it doesn't look like there is any positional feedback from the servos. A single one of these servos you mentioned (HSR-5590TGs) is almost more than the robot! Maybe too expensive for a hobby project? For the next prototype I've been looking at the T-Pro MG996R 55G  
 
http://www.hobbypartz.com/servo-mg996r.html  
 
which has some nice specs for a $12 servo. Do you have any suggestions for a good servo in the under $20 range?
Tuesday, August 09, 2011, 08:37:54
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owais 
so how will you attach stronger motors?
Saturday, August 06, 2011, 13:34:42
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jdow 
The next prototype will be a bit larger to accommodate beefier servos. I've been experimenting with 55g servos  
 
http://www.hobbypartz.com/servo-mg996r.html  
 
and been pretty happy with the results so far. I've also redesigned the joints to avoid having to use the radial ball bearings.
Saturday, August 06, 2011, 21:30:24
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Rift 
This is an awesome project! What would be really awesome is modding the brackets for use with Dynamixel AX-12A or AX-18A actuators. With the ability to create movements by just positioning the actuators it would bring another level of ease to the process.
Sunday, August 07, 2011, 16:14:37
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jdow 
The Dynamixel actuators have a lot of really nice properties ... I especially love the daisy chaining, rotational feedback, and the torque. I had looked at using them for the next prototype, but thought (perhaps foolishly) that I'd try and come up with a positioning solution for a cheaper servo. The next version will need to have 6 DOF per leg (for static balancing) which would add up really quickly if each servo was $45 or $95 Wink I've been experimenting with radial potentiometers for feedback and have had promising results so far.
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