New Feather Idea

You should only look at the peak current the speed controller can take in a burst, the nominal amperage of a speed 900 is about 8A. If you run the 900s at stall constantly you are doing something horribly wrong. Both the Scorpion XXL and the Sabretooth 25A will handle the speed 900s just fine.

Lol @ Joey :proud:

@ Ben

Im building a crusher (just to let you know :))

Spinner robots (fws) are only allowed in the robochallenge arena and rebel robots arena in the uk

Can anybody suggest a powerful eletric linear actuater, and a diagram of how biohazards weapon works, and a nice cup of tea

Ben...common sense would dictate that if you have to ask what you need for something or how something works, you shouldnt attempt to do it...

The answers are all to be found on the internet, if only you would look.

Ben, Biohazard uses a 4 bar lifter system.

http://www.robotbooks.com/mechanical-design.htmhttp://www.robotbooks.com/mechanical-design.htm

It is not the easiest system to get right, specially in a feather. There are easier lifter ideas to start with.

Theres Plenty of ways to do the 4 bar lifter systems.
Theres the ones powered by actuators like on Biohazard or theres a few other easier and harder ways of doing it.
Theres a few robots that have a motor or motors attatched to the rear arm on the 4 bar setup (where your would normally pivot the rear bar at the bottom) and as they turn the rear arm moves. hard to explain try look at these see if you can work out what im talking about.
http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/4-Bar%20Robots/?action=view&current=lifterwork.jpghttp://s189.photobucket.com/albums/z...cs/4-Bar%20Rob ots/?action=view&current=lifterwork.jpg

http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/4-Bar%20Robots/?action=view&current=Jan11_02.jpghttp://s189.photobucket.com/albums/z...cs/4-Bar%20Rob ots/?action=view&current=Jan11_02.jpg

http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/4-Bar%20Robots/?action=view&current=ioguts.jpghttp://s189.photobucket.com/albums/z...cs/4-Bar%20Rob ots/?action=view&current=ioguts.jpg

http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/4-Bar%20Robots/?action=view&current=tb4_66.jpghttp://s189.photobucket.com/albums/z...cs/4-Bar%20Rob ots/?action=view&current=tb4_66.jpg

ok?
Or you could use like a screw style lifter. i think elvis uses this kind of method altho its not a 4 bar system.
http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/4-Bar%20Robots/?action=view&current=IMG_2729.jpghttp://s189.photobucket.com/albums/z...cs/4-Bar%20Rob ots/?action=view&current=IMG_2729.jpg

Elvis:
http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/Others%20Robots/?action=view&current=elvis.jpghttp://s189.photobucket.com/albums/z...cs/Others%20Ro bots/?action=view&current=elvis.jpg

Or theres another kind of complex method like used in storm 2.
http://www.teamstorm.com/storm2/storm2b.htmhttp://www.teamstorm.com/storm2/storm2b.htm

Well this might not have been any help but i tryed.
Heres a link to a few pics i have collected of 4 bar lifter robots. theres a few other design types in there.
http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/4-Bar%20Robots/http://s189.photobucket.com/albums/z...cs/4-Bar%20Rob ots/

Edit: BTW im new to this hobby so double check with somebody a little more experienced if you decide to use any of the methods above. The guys on here are a huge help and you should definitely take note of everything these guys say it well help you out alot in the end.
Cheers.

(Message edited by xtreme on September 02, 2008)

I think i understand this, but could somebody explain how this works
http://s189.photobucket.com/albums/z244/TXROBOTICS/Combat%20Robotics/4-Bar%20Robots/?action=view&current=tb4cutout_blksm.jpghttp://s189.photobucket.com/albums/z...cs/4-Bar%20Rob ots/?action=view&current=tb4cutout_blksm.jpg
And can anybody suggest a good motor for the arm

(Message edited by neontetra23 on September 02, 2008)

Easy, the end link is just turned by a motor, over a certain angle. that motor has a large reduction added- probably a 2 or 3 stage planetary gear.

quote:

And can anybody suggest a good motor for the armThere are plenty of options if youre just willing to look.