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This project has evolved some , the basic rundown is I'm modding two Omnibots , one a regular the other a larger 2000 model. I will have two ezb kits , rad base idea was thrown out because of so much noise but could go back on the table if the omnibot drivetrain is too weak to pull it.
By jstarne1
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Yes I'm thinking of raising both the same height because I have a symmetrical obsession in many cases. I thought about extending length of arms at the elbows leaving everything else normal.
Remember that lengthening the arms increases the leverage against the servos. The arms raised horizontally in front of the Omni puts the most stress on the shoulder pan servo. Just remember to compute the max ounces at the full length of the arms. (Include the arm weight as well).
I'm contemplating using two standard servos for each shoulder for combined torque of 520 oz in. Well see gown much room I have after I raise stuff. And go from there.
Interesting idea. Want to try chat? This is getting lengthy. Here is my concern. As I understand you, there will be 2 servos on the shoulder. one on the inside and one helping on the outside. This makes sense mechanically but with servos constantly monitoring its position and moving to the correct position it is extremely important that the servos be exactly sync'd. If one is a single # value off from the other they will fight each other and draw lots of current. Try a proof of concept first by taking two servos and securing the housings still then attach the servo arms together then try rotating them together. (remember one is inverted)
Hey man I already passed out for the night , I can only chat in ez chat if I'm on a windows device , its not android capable. I understand what your saying , I'm going to check Tandom servo setups and come back and post what I found in a little while so its informative for all the readers.
YouTube video of hitec servos random for RC steering. http://www.youtube.com/watch?v=6b8SrNkmMQk&feature=youtube_gdata_player
tandem setup not a great idea,better to go a higher torque motots it saves time,may be money and wont get the bucking (whats called) of 2 servo's fighting each other.have to match speeds the same thwere is a lot of info on the internet about making a tandem setup,but bad is if a motor gear goes bad witch happens alot in tandem setup I made many homemade servo's using my own gear boxes,plus can easy buy a gear box from circuitcity or use a higher torque servo
@glickclick is correct about the servos too plus will double the current ,with a higher torque ,you willl get a little less torque depending how much lift you want
servo's i am using 680 oz,and may add a gear box for my omnibot hands i bought 12 of them at $70 each at servocity
@Jstarne1 It is possible and the video shows they are connected in tandum with an adjustable link. My concern is how well this translates when one is inverted. Seems like a lot of trouble to cut and mount two. What kind of weight do you really see this needing to lift? Personally Im more concerned with being animated than lifting anything. Again Im not saying its a bad idea but its a lot of work.
@robotmaker Were those standard size servos?! Please post link for us. Cant wait to see your robots!
Ha ha , yes I can't wait to see his projects too! I basically want him to be able to pickup / lift drinks and pour from wine bottle or other bottle , which the stock motors did . So 1 to 2 pounds.