pantograph movement

[Marvel]

Hello everyone, as from title I am trying to achieve a pantograph movement with aluminum arms and radial bearings.
Now, I managed to assemble the long arms and make them move parallels without problems, but when I try to join the short transversal arms with two bearings the connection only succeeds me with a bearing, while if I try also with the other it tells me or to interrupt a connection to use this or that the axieme will result ultradefined. I tried to find solutions on the internet but I found nothing. How can I solve this?

I'll pack a pack&go to bask you and make me right then...

Bye!

Mar

 

[MassiVonWeizen]

version of files?

 

[MassiVonWeizen]

without looking at the mortgage file that is a distance problem.
to make concentric coupling the circles or points that must join must have the distance from the absolutely identical fulcrum (in 2018 it seems to me it is possible to impose an error tolerance).
So I'll tell you to check these measures by setting the maximum of decimals, although I think solidworks requires perfect equality.

 

[LaboratorioDieci]

Nothing complicated. in the pantograph movement the parallelism takes place spontaneously for the characteristics of the mechanism and not as a starting condition. I have removed the constraints of parallelism of the arms and everything works perfectly

 

[Marvel]

Hello, guys, thank you for the answers.
@massi: version 2018. Okay, recheck the distances again, to verify that they are identical.
@shirokko: if you have removed the parallelism constraints on long arms it works. I put the bond to lock them in place.
the problem is on the short ones. I'll explain. blocking the long arms in place through the constraint, when you get to mount the short arm (e.g. the upper one sx) I put the bond between the rear arm/seat holes, but when I go to do the same on the front ones gives me the error messages mentioned in the post above. if I accept the new bond the previous one is suppressed or if I force the bond is ultradefined.

m

 

[LaboratorioDieci]

I think I found the problem. concentric coupling2 is made on the hole of the base component scissors lift rather than on that of shaped bearing support. a logic rigor should be the same thing, since the hole used is shaped on that of the right component, so the holes coincide, but in fact the system seems not to digest it.

 

[MassiVonWeizen]

There's a problem with bearings.
parts from zero; suspend bearings and eliminate all couplings.
then bind one to one the components by placing a coupling, which then you will eliminate, that makes everything stuck. You'll see it works. eventually reactivates and binds bearings.

 

[MassiVonWeizen]

found the hippo
eliminates the distance bond

 

[Marvel]

Hey, guys, okay, I'm gonna try and see it all over again and let you know.

Thank you so much!!

Bye.

m

 

[LaboratorioDieci]

found the hippo
eliminates the distance bond

You mean the one between the two pieces of the base?

 

[MassiVonWeizen]

you have only one coupling away... and anyway what you put to suspend it/delete it and verify the operation completely?

 

[LaboratorioDieci]

you have only one coupling away... and anyway what you put to suspend it/delete it and verify the operation completely?

Masses, now I am not in front of the project, but as far as I have tried and written previously, that bond serves to hold the two plates in place and then drill the one below with reference to the holes of the upper plate.

 

[Marvel]

found the hippo
eliminates the distance bond

great boulders!! done! now works as it should.... I wonder what bored him of that mating....

Thank you!

m

 

[MassiVonWeizen]

probably all the concentricities between kitchens and levers created a fixed set of them.
I tried on the flight without bearings and it seemed to me fuunzionasse also with the bond of distance.

In my opinion it is better to avoid coupling like this with part the intermediates that do not have a real function, but only getional. how do not mate the plates through the screws but directly between them

 

[Marvel]

.... how do not mate the plates through the screws but directly between them

thanks for the suggestion!

Bye!

m

 

[LaboratorioDieci]

Nothing complicated. in the pantograph movement the parallelism takes place spontaneously for the characteristics of the mechanism and not as a starting condition. I have removed the constraints of parallelism of the arms and everything works perfectly

questa mia was sbagliata

you have only one coupling away... and anyway what you put to suspend it/delete it and verify the operation completely?

I don't think that's a good idea.