You are going to need to determine how much torque is required at each joint. Physics text books tell us how to go about this. Without knowing your
configuration it is hard to say. But you more than likely going to be dealing with levers and probably gear ratios too. If that won't work you are always left with good
old trial and error approach. Make sure you know what the maker say the torque rating is for the different servo you try. Bigger will be better in general too as long as
it own weight does cause a bigger problem.
Take a good look at the newest servo from Hitec, the HSR-5995TG. Its designed for robotic applications and very robust. Metal gears, built-in heatsink, high torque, and yes digital. A good choice for any robotic arm or biped project.
Visit www.hitecrcd.com for the datasheet and pricing info.
Regards,
Michael G. Jessat
Post Edited (Dobermann (Black Dog Systems, LLC)) : 6/20/2005 10:21:40 PM GMT
A note on the Hitec 5995: Hitec had a production problem with these and they are not available unless you find someone with stock from the original production run(s). The last date I saw for restocking was July/August. If this isn't true and someone has a source for them, I'd love to see a post (I fried one of the 12 I purchased from the first batch).
In the meantime, for high-torque apps, I've had good success with the 5945 as a stand-in (though it requires a separate backplate/hinge). I find this page here to be easy to look at in terms of comparing (at least Hitec) specs:
Torque vs. size vs. power requirements is always something that should be planned out in the initial design process....but consider the fact that it's always better to plan 'too safe' than 'not safe enough'
Comments
configuration it is hard to say. But you more than likely going to be dealing with levers and probably gear ratios too. If that won't work you are always left with good
old trial and error approach. Make sure you know what the maker say the torque rating is for the different servo you try. Bigger will be better in general too as long as
it own weight does cause a bigger problem.
Visit www.hitecrcd.com for the datasheet and pricing info.
Regards,
Michael G. Jessat
Post Edited (Dobermann (Black Dog Systems, LLC)) : 6/20/2005 10:21:40 PM GMT
http://www.solarbotics.net/bftgu/tutorials_mech_torque.html
A note on the Hitec 5995: Hitec had a production problem with these and they are not available unless you find someone with stock from the original production run(s). The last date I saw for restocking was July/August. If this isn't true and someone has a source for them, I'd love to see a post (I fried one of the 12 I purchased from the first batch).
In the meantime, for high-torque apps, I've had good success with the 5945 as a stand-in (though it requires a separate backplate/hinge). I find this page here to be easy to look at in terms of comparing (at least Hitec) specs:
http://www.servocity.com/html/hitec_servos.html
(I don't work for servocity - just like the page)
Ryan
http://www.motiontoolbox.com/
Post Edited (Tronic (Greece)) : 7/1/2005 1:37:16 PM GMT