Hi
I am building my new robotic arm with Mega2560 for my home gardening.
The arm should hold the minimum 2 pounds of weight. I did not get right one from amazon. Pls suggest me, digital servo kgcm and robotic arm link from amazon for home gardening.
I need the aluminum/ alloy arm for long life
Thanks for your help
Regards
Jaganathan
jspavi:
Hi
I am building my new robotic arm with Mega2560 for my home gardening.
The arm should hold the minimum 2 pounds of weight. I did not get right one from amazon. Pls suggest me, digital servo kgcm and robotic arm link from amazon for home gardening.I need the aluminum/ alloy arm for long life
Thanks for your help
Regards
Jaganathan
I doubt you find industrial quality robot arms on Amazon.
Paul
Otherwise servo 20kgcm not enough
jspavi:
Pls suggest me, digital servo kgcm and robotic arm link from amazon for home gardening.
This is a Forum for helping people with Arduino programming, not for getting someone else to do your Amazon search for you.
...R
I agree, but what is the servo required to lift 2 pounds of weight.
Look at geared servomotors, geared steppers. You'll probably have to roll your own at this sort
of size.
The first step is to figure out all the mechanics, forces, speeds, torques. From this you can estimate
the power required for each axis, and from that a good gearing ratio.
The power and torque requirements will be much less if the design is inherently balanced about
each axis - you can use the weight of each the motor as counterbalance to the arm section it drives
jspavi:
I agree, but what is the servo required to lift 2 pounds of weight.
That question is too simplistic to have a practical answer. You need to design the arm and then figure out the loadings at various points, including the load due to the weight of the arm. For example a great deal more torque is needed to lift an arm with a load when the arm is extended - just try lifting a 2 litre bottle of fizzy drink with your own arm outstretched.
...R
Yes, its important to know how to calculate these forces and torques, which may mean revising some
basic mechanics, and deciding dimensions and materials (to estimate mass of parts of the arm itself).
jspavi:
I agree, but what is the servo required to lift 2 pounds of weight.
Well a micro servo fs90 has a torque of 1.5 kg cm (NOT kg/cm as most specs insist) so it could lift 2lbs which is 0.9kg if the arm was under 1.65cm, about 2/3" (since 0.9kg x 1.65cm ~ 1.5 kg cm)
It's the product of force and distance that's important. (Didn't some guy say 1000s of years ago he could move the earth with a long enough stick and a fulcrum?)
Most servo's torque ratings are not continuous ratings, but for short periods only, due to thermal
considerations - its wise to get a metal bodied servo for better heat/power handling for continuous loads,
but here are in the big league, standard hobby servos will not be anything like powerful enough...