creating pipe flat pattern
I have not looked at your model but I am attaching a 5-piece sheet metal elbow that may give you some hints. It is parametric so you can change the size, within reason, if desired.
John Hackney, Retired
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I tried to determine some general dimensions from your model but I am sure I missed them. I wanted to show you the general method of layout using construction planes and sheet metal contour flanges. In the first sketch I declared the split gap to be 0.5 degrees which can be changed within reason. I also did not bother with the one shorted side, that is simple to change by changing the length of the contour flange on one side and splitting the opposite side to make it shorter. By the way, I created only sheet metal bodies so you can only have one flat pattern at a time. If you want multiple flat patterns either redo the model using sheet metal components or maybe use the method outlined in this blog article and video. Model is attached. If you need an explanation of how it was done, just follow the timeline.
John Hackney, Retired
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I need to make sure that you understand, using the method shown in my model, the edges of the developed flat pattern(s) will not be square, they will be slightly beveled. This can be eliminated but for this example, I did not take the time to do this process.
John Hackney, Retired
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Your Sketch1 is not fully defined. (The very foundation of your design.)
I would start there.
There are repeated dimensions - generally not needed.
Many white dots (not good).
At least one duplicate line overtop of identical line...
An unresolved issue highlighted in the Timeline...
All Gores must have at least a microscopic planar flange.
I would use only Revolves (no Lofts) for this design (and Extrude or Sweep for the previously mentioned planar flanges).
Although Loft can return cylindrical, conic and planar geometry - it is generally best to use the most primitive geometry definitions possible.
As I try to decipher the true Design Intent - I have to wonder where this dimension came from?
I would expect this to be the controlling dimension?
My Sketch1 comes out like this - although I am a bit concerned about where 4 of the dimensions came from.
I generally use only dimensions that I can easily measure out on the shop floor.
Four of these Gores are simple trimmed cylinders while one is a trimmed cone.
Once the dimensions have been verified - I can proceed with the sheet metal parts.
One thing that will help the forum users, you need to click on the responder post YOU ARE REPLYING to. You are replying to yourself so no one, at least I do not, know how to respond.
John Hackney, Retired
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@davidSWEUU wrote:And overall dimension should be 21.75 on the inside of the material.
Previously I responded that I did not know what you meant by this.
Your latest file does not have the 21.75 dimension on the sketch, so I had to go fishing.
This is what I caught.
Now I can proceed to fry it up...
@carl.j.barker wrote:... but anyway how's this?
Model the two parts on either side of that one and take a look at the seams with the other two parts.
What do you observe? (Don't look below.)
For sheet metal - might be close enough with a bit of tinkering, but I don't know.
