moving an arm

ok this might seem stupid to some but…
how can you attach say an arm to a motor/servo so it will move it…:confused:

im confused…

someone…

please help!!

~Alex~

you need to be more specific what do you mean?

you can use a 1:1 gear ratio for a arm but it will have limits on its weight capacity i would at least use a 1:2 ratio

ok…
let me try to re explain this…
i wasnt asking about what type of gear ratio to use…
anyways…
i have an arm that i need to raise and lower…
my question is how do you attach a motor or servo to that arm as you can raise and lower it…

hopefully that cleared some things up.

For anchoring the arm you can use a C-channel on either side of the arm and use threaded beams to hole them together so your arm will fit in between. Then but a axle through your arm and C-channels and hook your gears and motor up and you will be good. If you dont have a C-channel you can use the Bars that are 1 wide and you hook them together with threaded beams they are very strong and twist resistent. Place the motors and gears down the C- channel or Bar.

New member here, Me and my son plan on doing this tuesday night, I will post a photo or two of what we come up with.

I built a robot with an arm that moves up and down. It can’t lift anything heavy though. It may be because of my design. I made an arm then attached gears to the end that was attached to the bot. Then had a platform next to it with a motor and a gear hooked underneath the platform.

Use a diffrent gear ratio i use a 12 to 84 then a 12 to 60 for my arms base vertical axis
Then to turn it i use a 12 to 84
Then for the claw i just use a servo