How do i get the beams tangent to cylinder?

bart_de_coninck

Info : Brown beam is a part , Yellow beams and grey cylinders form a subassembly.

Both are in an assembly.

What I tried to do :

1. Brown cylinder needs to be tangent to the grey cylinder.

2. yellow "rectangle" is in fact a series of rectangle beams that need to be tangent to the brown beam.

3. The yellow beams need to be parallel to grey vertical swallow 30x30 beams.

It took me ages and lots of errors to get 1.(2 cylinders tangent to each other) and 3.(parallel to vertical beams).

But whatever I do I keep getting errors when trying 2 (yellow beams tangent and touching to the brown cylinder).

What is the right procedure to get this done if possible?

Hopefully there is a simple solution. 

Thx in advance.

David_YL_Nguyen

Hey @bart_de_coninck,

Can you please share a link to your (public) document? This way people can have a look to help you out.
Are you working in the assembly environment and constraining the degrees of freedom with mate connectors?
Cheers

bart_de_coninck

Hey,

1. De link : https://cad.onshape.com/documents/cdb5784d58c774fcffa830c9/w/780e30c79fb7be4be9cd5353/e/fcb26e59c7142fb554c90ba0 

2. Yes, I work in the assembly environment.

3. No, I did not constrain the degrees of freedom with mate connectors. I read about which constraints to use and I tried that but that did not work.

    I will do an effort with mate connectors but I do not have my high hopes up.

David_YL_Nguyen

Hey @bart_de_coninck,

I would advise you look a bit more into the concept of mating and mate connectors in Onshape. There are two resources here:
https://learn.onshape.com/learn/course/fundamentals-onshape-assemblies
https://cad.onshape.com/help/Content/mate-fastened.htm

Top-Down and In-context design could also be really useful for your design and assemblies:
https://learn.onshape.com/courses/fundamentals-multi-part-part-studios
https://learn.onshape.com/learn/course/self-guided-top-down-design-in-onshape

For example, instead of using 3x planar mates to fully define the 30x30 beams you can just use 1x Fastened mate. So this would make it easier and safe you quite some time.
In an Assembly, once you have fixed one part, you can Group parts if there is no motion relative to each other.

You can have a look at this copy of your document where I have applied some of these concept: 
https://cad.onshape.com/documents/6a983ed56aaa45d3a70145f0/w/99de2887ed69743a5872134e/e/d76588dc4149bbd730b32970

Let me know if you have any other questions. Cheers

bart_de_coninck

Hey,

1. De link : https://cad.onshape.com/documents/cdb5784d58c774fcffa830c9/w/780e30c79fb7be4be9cd5353/e/fcb26e59c7142fb554c90ba0 

2. Yes, I work in the assembly environment.

3. No, I did not constrain the degrees of freedom with mate connectors. I read about which constraints to use and I tried that but that did not work.

    I will do an effort with mate connectors but I do not have my high hopes up.

bart_de_coninck

1. Thx for the advice on the Fastened mate.

2. But it does not answer my question. Of course I will get better when doing the courses....

    But with the given items I wanted to know what the procedure is. As in : eg : 1. Put a mate connector there 2. Then choose this or that mate.

    Even when following the courses I STILL have to trial and error in the hope it will work.

David_YL_Nguyen

Hey @bart_de_coninck,

Ideally you should not need to trial and error when setting up your assemblies/constraints. I think the concepts are pretty well explained in the courses.

I think there might be some issues with over-constraining your assemblies. Could you elaborate more on your problem, what is it actually that you are trying to achieve? What relationship? Do you require any motion between "Brown Cylinder" (Part 26) and Assembly Ass1 garenscheider?

I think your initial setup with a planar + tangent mate looked good to me. I have done the same thing in my example, did you see that?
Only difference, there was an issue for me using the tangent mate with the two cylinders so I used the sketch of the brown cylinder instead.

Would that work for you? Thanks