I built a biped robot but I found out that the servos that came with the EZ-Robot kit are not strong enough. The hip servos can't lift the legs up. Any suggestions for stronger servos?
By jeffmorris
— Last update
Discover more robots
Buratino's Buratino - Humanoid Animatronic
Buratino 50x50cm 3D-printed humanoid with 23 DOF, heavy-torque servos, EZB camera motion tracking, speech recognition...
Antron007's Mobi2 (I Like To Score Too)
Synthiam ARC Mobile Interface and Android app control a DIY Laser Pegs robot using modified servos, Xbox 360 controller...
Doombot's Doombot V1.0
DoomBot V1.0 - 5-ft robot with wheelchair drive, DC window motor arms, pneumatic cylinder and sculpted exoskeleton...
I got six servos that have torque rating of 240 oz-in and they can lift the legs.
I built the robot that is similar to Lynxmotion BRAT robot. I think the robot is too heavy beacuse the ankle servos can't tilt the robot to one side so that the leg that's not touching the ground can move to another position. Any suggestions?
Jeff, I built a Hexapod and biped using styrene. It's a light weight plastic material you can find at hobby shops or online. It can be cut with laser cutter or Cnc. I just use a razor knife and a ruler. There are many dowels and construction peices to help assemble the sheets (square dowels etc)
I used to use the styrene cement. Now I just use a hot glue gun
It might be a lighter solution for you. Most of the lynx motion kits that I've Experinced are too heavy for even the servos they include
Jeff cheapest places I know that carry styrene are sign and graphics stores. They buy in serious bulk and cut signage out of big sheets. If your nice to them they might even give you scrap for free to use.
I built a new version of the robot from 1/8" plastic sheet and it appeared to work better but I have to replace one part with 1/4" plastic. I tried a hot glue gun but it made mess on the work table.
Glue guns can get a bit dribbly
I have a DIY stand with a small square of tile that the gun tip rests on. No more table mess or concerns of burning where the tip rests. Next up is a light dimmer addition so I can vary the temp as required so that the glue won't be too hot and melt delicate materials.
Any pics of your new version?
If you need more of these hi torque servos, I found a better price for them on ebay. Free shipping too. Hope you get him walking soon. My EZ Robot board has been running 1/4 scale servos with no problems. I may give the servos their own power source just to be safe. High Torque Servos
The robot still doesn't walk well. Is it possible for a biped robot to walk the same way that a person walk?