Let's Make Robots!

needing help on a crane/boom to r/c

hello  everybody im new to this forum

 i build custom radio controll semis for a living .all one of a kind.73 build to date.

my new build is a crawler recovery truck .im at the point where i need to start thinking and building the boom,i want to make a working crane/cherry picker/boom/controll arm what ever you want to call it.

 the arm it self had to extend i say about 24 inch and has to pick up about 4 pounds

im running a 7.2v main battery and a 4.8v receiver battry.i would like to operate the boom from my radio.

could i please get some help here.or maybe buy this item from someone


heres my truck build  http://www.scale4x4rc.org/forums/showthread.php?t=21635

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Electrical? Mechanical? Manual? Running a 7.2V tamiya-style motor off an R/C set shouldn't be a big problem. Your simplest approach would be to buy and R/C electronic speed controller. If you want to make it autonomous, THAT's when the fun starts.
i would likw to run it of r/c radio.so it will 4.8v.i have 9 channel.i using the bruder crane/boom.the boom need to extend ,up/down and reel in.i know it looks simple but the psrts need i dont know.im sure i need mini motors with gear boxes.but i dont what controolei i need to link to the receiver

 Semijoe, I've seen your work, and I admire your craftsmanship. For the rig you're working on now, I can only think of two solutions: 1) Buy something of the rack (but I have no idea where to look), or 2) get blue prints or technical drawing for a real crane, downscale it, and send it for fabrication. You'll have to switch all the hydraulic pumps and stuff for pneumatics. you can then power the pneumatics from a CO2 cartridge, like the ones in paintball guns. Electronic valves for these sizes and pressures are easily available. An electric pump connected to a miniature air tank would also be possible, but rather large. 

The reason why I think pneumatic is recommendable instead of electric motor movement is that electric motors are bulky, and it would end up looking like you've chopped up a robot across the shoulders and strapped it on to your semi.


But then again, judging from your track record in machining skills, you'll probably prove me wrong.

Keep up the good work. 


/ vzz-clck-"Maneuver"

i have the boom that want to convert.maybe if send a picture you can give me some pointer


my email is maddhouse1@aol.com

"Electronic valves for these sizes and pressures are easily available."

 Tell me more.

well lets start witht the boomits 18inches long.it extends another11 inches out .it has 3 functions.with 3 knobs because its a toy.but i would like to convert to r/c


heres some pictures







Here are some pnumatics.


I think they use Bimba cylinders in their kits so it might be a good idea to go straigt to Bimba for a look, as well.

--"bimba"-- first hit google 


www.rocketbrandcustom.com baby!!

very nice ,but i dont think i want to go in that direct. awsom though!

You know what I think would be perfect for this? Servos modified for continuous rotation. They'd be great for extending the boom and perfect for operating the winder. (Assuming you didn't want to perform either of those operations with a big weight on the end.)

You'll need something beefier to actually tilt the boom. There I'm stuck for ideas. Some of the metal geared servos might do the trick. Look at MFA Como for geared motors.

youve ben a big help thanx