leverage with constraints

[dazo]

good morning, I kindly ask if with autocad2016 you can solve the movement of which I attach a scheme: I have to follow point 4 on the p path by turning point 3 of the lever l, causing the rotation of the arm b. applying the constraints I can bind points 1 and 2 to bind point 4 on the path line, but I do not get the result of the image because autocad causes the shift of location of the path line p. how can I correctly apply the constraints? Thank you.

 

[rpor66]

good morning, I kindly ask if with autocad2016 you can solve the movement of which I attach a scheme: I have to follow point 4 on the p path by turning point 3 of the lever l, causing the rotation of the arm b. applying the constraints I can bind points 1 and 2 to bind point 4 on the path line, but I do not get the result of the image because autocad causes the shift of location of the path line p. how can I correctly apply the constraints? Thank you.View attachment 51604

build a closed polyline on top 1 with two sides measuring equal to the middle of line 1-4, set the dimensional constraints aligned on the two sides equal, geometric constraints coincidence on top 1. do this you can move the summit resting on the path.

 

[dazo]

I tried but I couldn't get the result that I wanted the polylinea to distort, I must be able to rotate in point 2 the lever l and point 4 must follow the path p.........I see to do other tests...thanks in the meantime.

 

[rpor66]

in the attached dwg find the example, the path is in the blocked path layer, otherwise autocad takes the freedom to deform it.

 

[dazo]

Okay thank you, that's the result I wanted, now I try to replicate it.
1) for point 4 which must follow the path p has been applied a linking point-object or another type of bond? ... thank you very much.

 

[rpor66]

no constraint, simply move the summit through the grip using the nearest osnap

 

[dazo]

no constraint, simply move the summit through the grip using the nearest osnap

Thank you very much. Having regard to my competence, I ask myself another question: if I have to apply the same movement to a situation where the arm b and the lever l are made up of two blocks of 3d objects, can you act similarly?

 

[rpor66]

to apply the required constraints the blocks do not work well, they only have a point of insertion and manage the rotation to emulate the same behavior of the polylinea segment I think it is impossible.
with the 3d becomes even more complicated because autocad does not manage the constraints on three-dimensional elements.
consider that you can always align your block to the polylinear segment via the 3dalign command, with a little lisp you could also automate but it is not just stuff.
for mechanical parts simulations you should try specific solidworks or similar software.

 

[dazo]

to apply the required constraints the blocks do not work well, they only have a point of insertion and manage the rotation to emulate the same behavior of the polylinea segment I think it is impossible.
with the 3d becomes even more complicated because autocad does not manage the constraints on three-dimensional elements.
consider that you can always align your block to the polylinear segment via the 3dalign command, with a little lisp you could also automate but it is not just stuff.
for mechanical parts simulations you should try specific solidworks or similar software.

ok I will see to pass to solidwors is already I think of it......... thank you again for the courtesy.