stress raisers at intersections in assembly

rod_puckey

I can create an assembly from individual parts.

This leaves sharp corners where the parts are joined to form an assembly. This forma a stress raiser that will lead to failure.

How do I insert a radius between parts in an assembly

I've tried Boolean command but it doesn't work on an assembly.

There must be a way, but I cannot find it. Please help.

Matt_Shields

You are correct that sharp corners create stress risers in parts. But, joints between parts are by definition discontinuous. Adding a radius between discrete parts won't create smooth stress distributions. You will want to create the parts in a part studio and use boolean to join them together and then add fillets.

rod_puckey

My mistake, the sub drawings are parts of a whole finished item machined from a single billet.

5 variants, 3 sub drawings are common to each variant.

From your reply, am I correct in thinking that I must create ach variant from scratch as a single part, not using sub drawings?

rod_puckey

The assembly is made of a number of sub assemblies of a whole finished item. Creating them as discrete parts allows me to use individual sub assemblies in a range of whole finished items.

From your reply I believe that you are saying that as soon as I take discrete parts and make them up into an assembly I cannot then modify the assembly. That will fail in this case.

Does this mean that if I have 5 finished parts, Machined from single billets, that are made up of 5 sub drawings, 3 of which ae used on all finished parts, I must make the 5 finished parts as complete parts not using sub drawings?

eric_pesty

Assemblies in parametric CAD implies separate parts that are fastened together (often with some degrees of freedom) but do not create a single solid.

I think what you are looking for are "derived" parts and/or configurations.

Something like this:
https://cad.onshape.com/documents/d51e39f89aa3fa951f302d1d/w/eabcf7323125f9cbe024c874/e/28817e34ff91083ef01042d7