R2D2 jumbo dome servo ?

[xeno]

I want to redo the dome rotation on my R5 and thought to try to get one of those giant servos like the ILM R2 has, to have a better responsive dome to interact with kids at FACTS convention (Belgium)

I've seen this kind of giant servo inside the dome of R2D2 at Celebration III, but forgot Don Bies to ask where to get one like that,and I saw Grant use it in Mythbusters a few times.

I can't post a pic of the R2 dome inside as Don told me not to at CIII :cool
but where can I buy one, and hope it's no too expensive
and if too expensive, what would be the next best thing ?

.

 

[jonny5]

Two suggestions

Large scale sail winch servo.
http://www.superdroidrobots.com/shop/item.asp?itemid=901
(untested)

or the old standby R2Builders approved pittman motor
http://skycraftsurplus.com/index.asp?PageAction=VIEWPROD&ProdID=919
and this controller board.
http://www.dimensionengineering.com/SyRen25.htm
Their Syren10 will also work but is currently out of stock.

 

[artoo77]

You only have to ask...:rolleyes

Here's what we used:

http://www.vantec.com/ssps105.htm

I think we went with SSPS105S180, as it was slower but went almost 180 degrees.

The Futabe sail winch servo won't last long.

However, I wouldn't suggest using that set-up. There's a lot of torque involved, and the movement isn't that slick. My suggestion would be to use a slower, geared motor driving the rim, and then set-up an encoder to track the position of the head and relay that to a servo driver. That way, you have the same idea as a servo motor (i.e. positionable) but have smoother control.

And thanks for not posting those photos...although I think they're already posted somewhere.

--Don

I want to redo the dome rotation on my R5 and thought to try to get one of those giant servos like the ILM R2 has, to have a better responsive dome to interact with kids at FACTS convention (Belgium)

I've seen this kind of giant servo inside the dome of R2D2 at Celebration III, but forgot Don Bies to ask where to get one like that,and I saw Grant use it in Mythbusters a few times.

I can't post a pic of the R2 dome inside as Don told me not to at CIII :cool
but where can I buy one, and hope it's no too expensive
and if too expensive, what would be the next best thing ?

.

 

[xeno]

Hehe just checking if you still read the boards Don :lol

the high torque was on my mind too, so I was thinking to attach a gear setup to the lazy suzan.
but that would also mean to make the Servo rotate continuously,. I did that with smaller servo's, but could that be done in the same way with the bigger ones ?

I think, due to the prices, I might have to go with a smaller setup, but still want metal gears.

You only have to ask...:rolleyes

Here's what we used:

http://www.vantec.com/ssps105.htm

I think we went with SSPS105S180, as it was slower but went almost 180 degrees.

The Futabe sail winch servo won't last long.

However, I wouldn't suggest using that set-up. There's a lot of torque involved, and the movement isn't that slick. My suggestion would be to use a slower, geared motor driving the rim, and then set-up an encoder to track the position of the head and relay that to a servo driver. That way, you have the same idea as a servo motor (i.e. positionable) but have smoother control.

And thanks for not posting those photos...although I think they're already posted somewhere.

--Don