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Topic: What kind of servos for hexapod walk? (Read 1 time) previous topic - next topic

microguy

I would like to build hexapod walk or biped robot. I am looking for servos. I am not sure what kind of servos do you recommend? How strong do I need it for Hexapod or bidped? How many oz in? The only thing I know is to get hitec and make sure they are metal gears. Does anyone know where I get bulk servos for cheap price?

Reid

zoomkat

You can look at what servos are used in the below kits to get an idea of what works.

http://www.lynxmotion.com/c-3-hexapods.aspx
http://www.lynxmotion.com/c-85-bipeds.aspx
Google forum search: Use Google Advanced Search and use Http://forum.arduino.cc/index in the "site or domain:" box.

Benji

To establish the amount of torque you need, there is not enough information.
The weight of the total bot, the weight of the parts you need to move, the travel they are going to make (if you have a 20cm long 'leg' you need more torque compared to a 5cm long leg, even if they are just as heavy), etc.

You can get the highest torque possible in the size of servo you wish to use, and be good, but that can be a very expensive way of buying servo's, if you are just building a 20cm hexapod made out of 3mm abs or something.

tchadwick

#3
Feb 25, 2011, 04:52 am Last Edit: Feb 25, 2011, 05:25 am by tchadwick Reason: 1
You might check out this site: http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8496
The website is pretty good, and those particular servos should give you ample torque if they fit within your design.
(I don't know about these servos for quality, but due to good reviews and good pricing, it might be worth it to try 'em!
Oh and I recognize that they are not Hitec, but can you afford the difference?  These are about 25 + shipping, 33 kg cm (457 oz-in), the corresponding hitec would be the HS-7950TH which will run you around 149 ish

Benji


You might check out this site: http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8496
The website is pretty good, and those particular servos should give you ample torque if they fit within your design.
(I don't know about these servos for quality, but due to good reviews and good pricing, it might be worth it to try 'em!
Oh and I recognize that they are not Hitec, but can you afford the difference?  These are about 25 + shipping, 33 kg cm (457 oz-in), the corresponding hitec would be the HS-7950TH which will run you around 149 ish


These are bigscale servo's, meant for 1/5 scale RC cards. The servo itself is almost 8 centimeters long, which is HUGE for a hexapod servo.
This is absolute overkill. 12 of these will make the pod over 1,5kg heavy without the rest of the materials, and you will not need 33kg/cm.

Hitec servo's are awesome but expensive.
You can just as well fit some higher torque Futuba Servo's, even Power H-D servo's will do (that's what I'm going to use for my pod, cheap and pretty good specs).
Just be sure to take metal gear servo's from a known brand (No Towerpro, they will make you go crazy with burning out and jittering when they do work).

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