Assemblies->gravity force and constraints. Thanks!

[Anonymous]

Hi!
It has been a while…

😊

I am new to assemblies and I am stucked   with a few questions.

I hope someone could help me.

This is draft simulations of a crane

1)When I added cable 3 I can’t move pipe 2

2)How do I constrain bucket in order to align it in the middle of the handle?

3)How can I apply gravity force on bucket

in order it to look natural when I manipulate cable3  and pipe 2

Thanks !!!
Huge thanks!

link to project https://www.dropbox.com/s/lsiighvj1khqd93/crane%20zipped.zip?dl=0

Thank you in advance!

[kelly.young · Accepted solution]

Welcome to the Inventor Forum! Thanks for sharing your files, keep asking questions and we'll do our best to help out.

First thing I notice is your assembly is not Grounded, meaning the whole thing can move around. I would recommend taking the vertical tube (that will be the base and not move) and selecting it either in the viewer or in the tree. Assemble > Productivity > Ground and Root Component. This will stick the origin of the Part in relation to the origin of the Assembly. Makes easier for locating, viewing, measuring, and centers everything. Keeping the base part at the grounded origin eliminates headaches in the future.

In Part crane1:2 your Flush:5 constraint should be a Mate to put it adjacent to the edge rather than inside and colliding the parts. Find the constraint in the tree > R+click > Edit > change the box from Flush to Mate. Do the same thing with cable:1, Flush:2.

For the bucket it is mated to the hole, but has freedom left to right. Find in the tree Origin > YZ Plane. Create a constraint with that and the Origin > Y-Axis of cable.

You can constrain the bottom of the bucket to be in line by angle to the origin base plane (floor). Assemble > Relationships > Constrain > Angle (2nd box) > Directed Angle. This will keep the face of the bottom of the bucket in line with the floor, so as you raise the crane the bucket will stay level. This is not a gravity simulation, but will keep your model squared and easier to work with. For gravity simulation you'll have to get into Environments > Dynamic Simulation, but that is a bit advanced for now. I would focus on getting your part files a bit more accurate and assembly constraints dialed in.

[johnsonshiue]

Hi! I could be wrong but I would constrain these components much differently. First, I don't think those tangent workplanes are needed. You can simply constraint to XY planes in the crane parts and the cable. For the bucket, you can constrain its YZ plane to the global XY plane. Second, I would ground crane1:1. There too may DOFs in the assembly, it can be confusing to understand which part should move or rotate.

Could you take a look and see if these suggestions make sense?

Many thanks!

[Anonymous]

Dear @johnsonshiue and @kelly.young !

I will try that tomorrow,

as for now I just want to say that I do appreciate your help!