Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: Bciaren on July 03, 2013, 08:49:11 PM

Title: First attempt at a robotic arm! Suggestions for base?
Post by: Bciaren on July 03, 2013, 08:49:11 PM
OK, so here's my base thus far!
(http://i359.photobucket.com/albums/oo39/r19ecua/Basepicture.jpg)



Anyway, the problems I've been facing with this base is that it's all wobbly once I start attaching the arm!  People suggest I install rollers, but I don't have any idea how to actually do that!  I'm doing small scale here (1/8" thickness), any suggestions?  Or better yet, a direction?   
Title: Re: First attempt at a robotic arm! Suggestions for base?
Post by: nanotechopolis_gr on July 04, 2013, 01:26:18 AM
you should install rollers because otherwise your arm it will not has balance , check out the shematics ( i am not good at paint  :P )
Title: Re: First attempt at a robotic arm! Suggestions for base?
Post by: waltr on July 04, 2013, 07:54:06 AM
Maybe a Lazy Susan bearing.
http://www.amazon.com/Susan-Bearings-Thick-200-lb-Capacity/dp/B0006LBVDI (http://www.amazon.com/Susan-Bearings-Thick-200-lb-Capacity/dp/B0006LBVDI)
Title: Re: First attempt at a robotic arm! Suggestions for base?
Post by: Bciaren on July 05, 2013, 07:16:59 PM
Wow!  I am going to check that lazy susan bearing out!  Thanks!
Title: Re: First attempt at a robotic arm! Suggestions for base?
Post by: Fr0stAngel on July 07, 2013, 08:02:54 AM
You could use a bigger servo horn... or perhaps a attach a support plate to the servo horn so it has more area under the base, and takes up force more evenly from the top
Title: Re: First attempt at a robotic arm! Suggestions for base?
Post by: Arduino02 on July 09, 2013, 02:52:58 AM
you need to add gaskets on legs and tops of all five screws, tie them up with nuts for both sides of board, cause area of thrust surface is too small.

also there is other option, there is a 6-dof robot arm chassis robot arm support turnplate for your reference, here is the link:
http://www.mhobbies.com/6-dof-robot-arm-chassis-robot-arm-support-turnplate.html (http://www.mhobbies.com/6-dof-robot-arm-chassis-robot-arm-support-turnplate.html)
Title: Re: First attempt at a robotic arm! Suggestions for base?
Post by: Bciaren on July 12, 2013, 04:20:30 PM
Thanks for the help guys!  I used a lazy Susan bearing and it worked out like a charm!

(http://i359.photobucket.com/albums/oo39/r19ecua/susanplate.jpg)

Now the next step is to put a gripper together!  Anyone know of any companies that deal in gears? I find myself having a difficult time finding 1" diameter 64 pitch gears anywhere in NYC!  NYC seems to be anti hobby really..
Title: Re: First attempt at a robotic arm! Suggestions for base?
Post by: jwatte on July 12, 2013, 11:30:45 PM
Gears places:
sdi-sp.com
rapidgears.com
mcmaster.com

Or hob your own :-)