Has anyone built any Robo-One type servo brackets? I'm really interested in building a Robo-One but about fell out of my chair when I saw the $4500 price tag for a kit. The new HiTech Robot Servo is nice but at $110 ea is pretty pricey. Especially when you need 17 or more of them.
hello, i'm italian and i built a humanoid robot. you can see at
"Bob Waters" ha scritto nel messaggio news: snipped-for-privacy@corp.supernews.com...
Bob,
I have been working on my "Robo-One" style bot on and off for about a year. Here is a link to a page with some pics of some of my stuff. It's not pretty, but I'd rather spend the little time I have on the bot rather than the web page. I'm on my third generation design, and I'm starting work on the fourth generation. It might actually make it past the leg stage!
Did you see that sozbots is selling one (the "KHR-1") for about $1700? Still a little steep, but it's right in the ballpark of what I'm spending to build mine.
--Steve
Can you provide a link to the HiTech Robot Servo ? I haven't been able to find one on the net via Google. Thanks!
Lynxmotion is selling them but currently out of stock. I saw another site selling them but the price was through the roof. I suspect that the price will come down a bit when more distributors get in on the act. Guess it's too new to be widely available.
Found some at this site. Maybe the exchange rate from Dollars to Yen is driving the price but I'm not paying $70 ea for a servo bracket
Good grief! I hope it includes the servo at that price.
--Steve
No servo included. Maybe we need to get all the Robo-One people to go in on an order to E-MachineShop and have a bunch of brackets made up. I don't think it would cost much to blast those out on a water-jet cutter.
I paid about $125 for 20 of the "servo shells" that I had made for my bot as seen here:
--Steve
I'm not specifically familiar with the robo1 brackets, but these 2 companies sell a variety of servo brackets ...
- dan michaels
Hello J. Very nice mechanical work on that. Looks like you're controlling it from a PC via a slave servo controller. What are you using for a power source, for those of us who don't speak much italian? What is the total weight so far?
thanks,
- dan michaels
Hi Steve, someone on yahoo robotics club said he has a KHR-1, and the batteries give him about 20 minutes of service, but 600 mAh is just so small for 17 servos, so ????? I've been working on an 16-servo octopod, and using 2300 mAh NiMH's, and it doesn't get much more time than that.
Looking at your biped, it has some really nice mechanical work, like Jodinsky's biped also has. I imagine all that metal rolls up the weight quite a bit. My octopod weighs about 70 oz [2000 gm], mostly for the servos, batteries, and legs, which have a very minimal amount of metal on them. The aluminum deck is 14 oz, which seems like something I can address regards weight reduction.
So, I'm thinking that so much metal on the bipeds must really run the weight tab up very fast. We pretty much have the same power vs weight vs battery problem here that the electric motor RC planes have.
- dan michaels
Dan, I'm planning to move to NiMH batteries soon for better power per weight. I can't figure how they get 20 min out of 600mAh either. Especially for 17 servos...
I don't have a scale, so I'm not sure how heavy mine is. I have 12 servos on the legs and I'll have another 10-12 for the upper body. Weight and a few other considerations is why I am working on a new servo bracket. I went over to the CNC shop today and they had made a mistake so they are going to re-do them. I hope to see them next week. The thing I like best about Jodinsky's biped is that it is complete. If I keep improving things at this rate, I'll never have a complete bot! I wanted lots of degrees of freedom to work with, but in the long run it may be that removing a few servos will make a big enough weight difference (and $ difference) to justify the loss of a few DOF.
--Steve
--I thot the original concept of this was that the patterns were freely downloadable, but I have yet to find a link to a site that has them. IIRC when I talked with a Robo One builder last year he said that one could literally print out the parts, glue the paper to sheet aluminum and, basically cut (mill?) on the dotted line, then bend the same way. Is this not an option? Harrumph.
Now that's what I want to see. Anybody know about this?
Found the patterns or at least some patterens here.
I used to have a scale, but it broke, of course. Now I take my parts down to the post office and surreptitiously weigh them on the postal scales when no one is looking ;-). Accurate to under 1 oz.
What I found was that you can easily overpower your servos as the weight goes up, just by including the "minimal" amount of structure, and all the bipeds seem to have a lot of metal on the legs/etc. Once you get those legs together, with 3 or so servos linked in series, you suddenly have a very long torque arm to deal with. Std servos working against a 6" torque arm gives you only 44/6 = 7 oz to work with. And one leg has to hold up the entire machine. Nice thing about multi-peds is several legs can share the load.
- dan michaels
Robovie-M is pretty cool. It walks just like and looks like a chimp. Long arms almost scraping the floor, used for dynamic balance.
- dan michaels
Good idea.
I'm using Hitec HS645MG servos with 133 oz/in torque at 6V. That's around
22 oz per leg to work with. The MG is for Metal Gear. They also have a nice bearing in them. Absolutely necessary for the conditions a biped subjects them to. Also the "Servo Saver" is a great gizmo, but gives up too easily under my biped load.Those little 44oz things barely even work for a good pan and tilt.
--Steve
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.