Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.
First time visiting? Here are some places to start:- Looking for a certain topic? Check out the categories filter or use Search (upper right).
- Need support? Ask a question to our Community Support category.
- Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
- Be respectful, on topic and if you see a problem, Flag it.
If you would like to contact our Community Manager personally, feel free to send a private message or an email.
Removing extra parts of extrusions
harry_keith
Member Posts: 10 ✭
I am trying to make a simple right angle pipe fitting. The actual project is more complex, but this is the fundamental problem. I've made a working document of the issue:
Here's the problem. Take two circles at right angles, extrude them to make an elbow. This is done in manufacturing all the time, and even mass produced items (a PVC elbow at a big box store) are essentially done this way. My sketch, as initially extruded, has each part extend past the other, and there is no open passage. Some efforts:
- Make the second extrusion from "away" and extrude "toward" the first extrusion. Then do a removal extrusion on the inside to the middle of the first extrusion. This works fairly well, but the first extrusion is still a mess. And horribly complicated.
- Use a loft. This actually works well if you want to use two identical sections. In my current project, I want to then taper one side (by means of a draft), and it fails. It also would fail if it were a reducing elbow (1" on one side, 3/4" on the other).
- Build a 45-degree plane, then extrude each side to the plane. This works well, but is a bit of a hassle (and won't work on mis-matched size/shape parts).
- I read about splits, and can't get anywhere
- Frames seemed like a route, but couldn't get anywhere
- Boolean almost seems to want to be an answer, but I think not.
In a prior project (I worked around this) I was basically building an igloo. A dome shaped housing, with a half-pipe shaped pipe protruding out one side. The basic shapes were easy, getting a clean merge of the two into one part wasn't clean (my solution was fine for my application). If you want to see it, it's here:
https://cad.onshape.com/documents/fa79761ed5c4cc30f33ce288/w/bf00fb19378620770cbe346b/e/101bbec2b6c3fed1a3753fe4?renderMode=0&uiState=6916602727762b9c94587c66
This has to be such a common design feature that I keep looking for it to be built in, or at least a custom feature. If it exists, my searches are letting me down.
Thanks!
Comments
Hello Harry. This document has a couple of part studios that I think accomplish what you want. The dimensions are within the Variable Table. - Scotty
Have you tried sweep?
You're workin to hard @harry_keith . 😲
https://cad.onshape.com/documents/ab98cfb7a6515c78bfce97dc/w/0fbe40e8aadf271dff47a700/e/5f0b171fd89bc713fd7af0ab
Yes, I've come across the sweep, and it works well. But what if it's not quite so simple? The pool diverter mentioned above doesn't fit a sweep very well.
https://cad.onshape.com/documents/fa79761ed5c4cc30f33ce288/w/bf00fb19378620770cbe346b/e/101bbec2b6c3fed1a3753fe4?renderMode=0&uiState=6916602727762b9c94587c66
I don't know about everyone else but I'm having trouble deciphering what the real issue is. Your document showed same diameters so that was what everyone focused on. If you want an elbow with different diameters or shapes use a loft with a path and/or guides. instead of a sweep.
Yes! I'm fairly new at Onshape, under a year of amateur use. I'm fairly good, but still very much a beginner, and almost entirely self-taught (meaning, I only learn and practice the tools I've learned — until I learn a new one).
The loft is the answer. I've done a couple of them, but I'm still not proficient at them. But you've demonstrated that they are the perfect answer.
I need to push loft (and sweep) higher on my list of tools.
Thanks for tolerating my fumbling.
no worries. I had hoped I'd correctly deciphered what you wanted. I'd like to assume you've seen learn.onshape.com. since you've been using it for a year. but not knowing what loft is capable of…maybe you didn't. there are loft specific tutorials on there.