Frame Trim - Normal to Surface

Lucas_Kuhns

I need a little help modeling this frame trim the way I want. There is a round pipe teeing into another round pipe like this:

You'll notice that the endpoints on the blue pipe come to a sharp point. What I would like is to create a surface from the inside edge that is normal to the outside of the pipe. I'll use this surface then to trim the end of the pipe off. It doesn't have to be a surface if there's some other way to accomplish this task. For those that know the reference, this is to model the part as a tube laser would cut it "normal to surface".

Example document here: https://cad.onshape.com/documents/3cfd371e4c94164020c799c5/w/dd67b9eb8d5cc3617c0b8526/e/4ca78262598923f558705ead

Caden_Armstrong

Sounds like a ruled surface?
Create a ruled surface with the inside edge and inside face as references. I found I had to play with it a bit to get it to work, playing with tangent/normal and 90deg/0deg.
Use the resulting surface to split the part, deleting in sharp end bit.

Lucas_Kuhns

That did it! Wow thanks! I had tried messing with that but didn't stick with it enough apparently. FYI, I needed to set it to 180 deg..

https://cad.onshape.com/documents/3cfd371e4c94164020c799c5/w/dd67b9eb8d5cc3617c0b8526/e/4ca78262598923f558705ead

glen_dewsbury

Instead of typing 180 deg try the flip arrow.

Ps. When the angles get to something other than 90deg butt joint, watch that the reference surface doesn't jump to something other than what you want. If is a small angle difference you may not notice until it goes to the shop.

Took a lot of individual steps for me to work through this simple model with 3 parts and it's not done since these tubes all connect to many other tubes that need the same treatments.

https://cad.onshape.com/documents/c735f911656197548a135a03/w/f0b97f029af9835d24cd6326/e/ba07ba0a8aa7d06bb3251a1d

jnewth_onshape

@Lucas_Kuhns @Caden_Armstrong Please file an improvement request or bug with support. I've seen a number of users with this issue. The geometry created by our current trim is extremely difficult to laser. A ruled surface is a good workaround but this should be incorporated in to the tool itself.

wayne_sauder

See this improvement request.

https://forum.onshape.com/discussion/23465/beam-trim-improvements-when-designing-for-tube-laser#latest