Hello,I don't understand,can you help me? Consider a mechanism consisting of three spatial rigid bodies (including ground,N=4) and four joints: one revolute, one prismatic, one universal, and one spherical. According to Grubler's formula, how many degrees of freedom does the mechanism have?
with the last example(stewart platform) you said the body has 3 joints with 6 degrees of freedom, which is true for the sphercal joint of each leg. But then again, each leg has a prismatic joint(with 1 dof). therefore i think each leg has a total of 7 degrees of freedom instead of 6 as you said. therefore we have Fi=42 instead of 36. i stand to be corrected
Actually on the second animation it was a bit misleading; it shows two spherical joints on each leg, but the animation that was playing before showed only one. Regardless, if we go by what he says during the first animation, each leg has one universal joint (2 dof), one prismatic joint (1 dof), and one spherical joint (3 dof), totaling to 6 dof on each leg.
This video is so much better than the previous one
thank God I found this channel
You made things so much easier.
Hello,I don't understand,can you help me? Consider a mechanism consisting of three spatial rigid bodies (including ground,N=4) and four joints: one revolute, one prismatic, one universal, and one spherical. According to Grubler's formula, how many degrees of freedom does the mechanism have?
Excellent work!!! Thank you so much for share your knowledge!
Love your videos! Great job!
4:18 How do you identify dependent constraints though?
You are saving alot of time
you absolute legend, great explanation thanks
with the last example(stewart platform) you said the body has 3 joints with 6 degrees of freedom, which is true for the sphercal joint of each leg. But then again, each leg has a prismatic joint(with 1 dof). therefore i think each leg has a total of 7 degrees of freedom instead of 6 as you said. therefore we have Fi=42 instead of 36. i stand to be corrected
Actually on the second animation it was a bit misleading; it shows two spherical joints on each leg, but the animation that was playing before showed only one. Regardless, if we go by what he says during the first animation, each leg has one universal joint (2 dof), one prismatic joint (1 dof), and one spherical joint (3 dof), totaling to 6 dof on each leg.
great work! thanks
In 4 bar robot, how N = 4 came ?
It should be 5 .
I don't understand,
Please someone make it clear.
There are 3 links and 1 base. You always include the base or fame of reference, so N=3 links + 1 base = 4.
how could we get the joint constraints?
I need report for 5 Degrees of freedom
are not you annoying with writing transverse
it's a basic inverse effect
He does not know how to teach sadly