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<sbixler> wrote in messageHere's
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a drawing of the flat pattern. The width at the quadrant positions is 100 mm,
but it gets a little wider in between. So, it's not exactly the same
width all around, but certainly a very usable and useful part. Geometrically
exact is fun to play with and a good mental challenge; functionally exact is
what's needed for the work to get done, though not as satisfying.
Sam
Just in case anyone reads this thread again, it's been over 14 years since the last post. a Repad on centerline is easier than the post above. The repad is not a circle, it's an ellipse with an offset for the width you want. let me explain let's look at the (4) quadrants of a circle 0, 90, 180 & 270, if you draw your repad as a circle and bend it 0 & 180 is still the correct diameter, but 90 & 270 is now smaller because of the bend. draw your sketch as an ellipse and your done.
Hi! There is another approach. Create the bent circular plate without the hole. Then cut the hole. After that, use Thicken -> Intersect from both sides to ensure the side faces be perpendicular to the ring faces.
Many thanks!
you are correct you could do that if you are creating a repad for drawing representation and it's the fabricators responsibility to make the repad correctly, because doing that now gives you an ellipse on the I.D. and a circle on the O.D. giving you a variable width in your ring when you do a flat pattern and if this is a ASME code tank you don't want to do that. I just did one yesterday and my I.D. ellipse compared to a circle was nearly 5/8" bigger on each side. the only correct way in Inventor to do this is to design the repad it its flat pattern form and then bend it.
let's simplify this and look at it from another angle. take a 3" hole saw and cut a hole in flat plate, now cut a hole in 6" pipe. now measure the circumference of each one. they are different so, starting with an ellipse gives you the right circumference.
these are things that frustrates me so much about Autodesk. there are a many different ways to do this to represent a finished part it won't produce a correct flat pattern or won't even be able to do a flat pattern. but to produce a finished part correct with a correct flat pattern we have to jump through hoops. Autodesk could easily create a tool for this kind of stuff but nope every year we get a new version of Inventor with 75% non-design related stuff and the other 25% is a 1% fix on 25 different things needing improvement.
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