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create kinematic/crank with two closed chains

Experimenter
Experimenter

Hi,

 

I'm not able to create a kinemaic with 2 closed chain.

The type of joints are a little differen as the predefined cranks in the kinematic editor.

 

I tried it manually (see attached pic "kinematic_manuell")

and with the predefinded kinematic under "create crank" (see crank.png)

 

after I finised the manual try, the "open joint jog - command" is disabled.

Before closing the 2nd chain, the kinematics moves with the jog command as expected.

 

at the create crank-command the "three point"-crank is not the correct crank i need.

the output-link is not a revolute joint, i need a prismatic joint.

 

How can i create the correct kinematic?

 

 

2 REPLIES

Re: create kinematic/crank with two closed chains

Siemens Phenom Siemens Phenom
Siemens Phenom

Actually both ways should work.

Manual way: the last arrow in your chain must point backwards.
Means your J3 looks correct, your J7 does not.

Using crank:
Create your first loop.
Then open the wizard again and do the second chain.
Now comes, what you might not have taken into account:
Any kinematic in PS is only allowed to have ONE fixed link.
So while you go through the wizard for the second chain,
select the existing fixed link as your fixed link for the second chain as well.

Hope you can solve it now.

Re: create kinematic/crank with two closed chains

Experimenter
Experimenter

Hi Guido,

 

thanks for quick reply.

 

i will try it again in the holidays.

If i fail again i will share the cad data.

 

Merry christmas