New Feather Idea

[leorcc]

New Feather Idea

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.

[xtreme]

New Feather Idea

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, 200

[neontetra23]

New Feather Idea

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, 200

[maddox]

New Feather Idea

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.

[kodster]

New Feather Idea

quote:

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

[neontetra23]

New Feather Idea

would an NPC 02446 be suitable

[woody]

New Feather Idea

You might find this useful....there is prog to download and play with.

http://www.totalinsanity.net/tut/mechanical/4barfrontbar.phphttp://www.totalinsanity.net/tut/mec...arfrontbar.php

[leorcc]

New Feather Idea

I use that program, its very handy once you get the hang of it.

[xtreme]

New Feather Idea

why not lift a car?
http://cgi.ebay.co.uk/ELECTRIC-2-0-TON-CAR-JACK-12-VOLT_W0QQitemZ250286616128QQcmdZViewItem?hash=item 250286616128&_trkparms=39%3A1|66%3A2|65%3A3|240%3A 1318&_trksid=p3286.c0.m14http://cgi.ebay.co.uk/ELECTRIC-2-0-T...50286616128QQc mdZViewItem?hash=item250286616128&_trkparms=39%3A1 |66%3A2|65%3A3|240%3A1318&_trk sid=p3286.c0.m14

Dont really its a bad idea. but thats just showing u can lift a car on 12v with the correct gearing and stuff. but with gearing the motor down the heavier you want to lift the slower it will lift

[maddox]

New Feather Idea

Bit heavy with 2.2kg Ben.

On 24V it does only a bit more torque than the 3 times lighter Speed 900.
A Speed 900 with a suitable gearing is better in any respect.

[neontetra23]

New Feather Idea

ok a speed 900, but what gearing should I use?

[swanaldo]

New Feather Idea

ben why dont you just get your wallet out and ask mario to make you a feather drive. he will do a good quality job and you will have yourself a drive ready to bolt into your featherweight chassis, whatever that might be.

if not why dont you work out yourself what size wheels you will be using and work out the gear ratio yourself.

its all good and proper asking all these questions to these roboteers who are more than willing to help but posting off the cuff remarks like ok a speed 900, but what gearing should i use after all the help and pointers you have been given directs me to believe you dont intend to build a robot at all.

all that said at least some good pointers are being posted. but then its nothing that hasent been posted before on this forum you just have to look.

[maddox]

New Feather Idea

A reduction of 66 to 1 is what I have calculated.
So, to make it easy and mechanicaly acceptible, a 2 stage gearing each stage 8 to 1, what gives us 64 to 1 gearratio.

[neontetra23]

New Feather Idea

Mario, could you make the gearbox-motor assemblies?
How much would they cost?

[maddox]

New Feather Idea

PM of mail me with that kind of questions.