Inventor2010 acentric cone

[autodesk-MM]

HAs anyone tryied to draw with sheet metal rules an acentric cone? Ive spent hours on it and nothing, it always end up on ASM failure, or ceates the only one half( when sliced on asymetric way). This need to go in two halfs.

Ive tryied:

two circles 1300 and 300, top circle centre moved from Y by 127mm on X axis.

contour roll will revolve on axis between circle centre points, than extrude something with cut and it is but the shape is an oval not circle.

Ive used loft command and slice command but only one side picke will work with flat pattern.

Any help? thank you.

[Anonymous]

Something like this?

[MariaManuela]

The better tool is really Loft Flange.

So...If you need two sides you should do one by one.

Split the sheet metal cone (deleting one side).

Save Copy As the cone as SideA.ipt

Then In the original file,  do undo or edit split feature to get the other side now

Save Copy As SideB.ipt

You get 2 components both unfolding in flat pattern tool.

Hope help.

[autodesk-MM]

Sorry, no. For drawing way, yes its easier way. But when you start fabricating something like that need to go on rollers.

Lofted flange is for flanges which means you need to use bending press. I need smoothe shape which can be given by rollers only- sorry I didnt mentioned.

First tool Ive used was a Lofted flange, unfortunatelly this need to be rolled.

[MariaManuela]

Try Die Formed output

[autodesk-MM]

Ive tryied to split a shelled solid cone, unfortunatelly flat pattern will create only when you slice across (in asymetric way- if you can understand). If you slice across- sides symetric- it will not create a flat pattern showing ASM failure. Want to re-create reference points (according to autodesk by taskbar scheduler which should be in tools- not in inventor2010).

[MariaManuela]

Could you please send the file that you already modeled.

[Anonymous]

How 'bout this then?

[MariaManuela]

That's it that you want?

I performed the "split" in X direction, but Inventor allowed me do the same in Y direction.

[autodesk-MM]

Yes, thanks to Manuela Ive done the same thing as you. When you using a rollers you need to have a centre line, there is no problem with symetric cone. With acentric fabricator will start from center point and will roll to the edge.

My one  gives that point but Ive end up with a small oval. On the model there is small gap and small overlap-I couldnt go any better in this case (to see flat pattern move "end of folded" over mirror)

This was a quick job, however I dont like to send out something like that and in the next time I would like to finish my project in proper way.

[JDMather]

This doesn't look right - you shouldn't be using Extrudes, solid Splits or Mirror features in a part like this.

[autodesk-MM]

Agree, it doesnt, thats why Ive asked the question- to find the better way.

But going the way Ive done it flat pattern show me a start line, so the fabricator knows where to start. (See flat pattern, line is not in the centre-you can spot two different arc lenghts). Maybe it's not a profesional way, but is better to do ish design than waste 2 sheets of SS.

Have you got something better?

[autodesk-MM]

Mirror is just to save time in assy dwg

[JDMather]

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@autodesk-MM wrote:

Mirror is just to save time in assy dwg

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But causes problem as far as I can tell for sheet metal files?
I would use Derive Component - Mirror.

[JDMather]

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@autodesk-MM wrote:

Agree, it doesnt, thats why Ive asked the question- to find the better way.

..... but is better to do ish design than waste 2 sheets of SS.

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Do you realize that when you used Extrude-Cut 1 and 2 that the edges of the flat pattern are now at an angle - not perpendicular to the flat?  (look at the flat in wireframe view)

[JDMather]

What are your intended diameters and offset distance.  (for the intended diameters - specify inside or outside as the controlling factor)

[autodesk-MM]

Yes dxf will have two lines- means extra job in Radan or AutoCad, can be done.  It doesnt really matter, the one Ive done was done wrongly and I know about it! This is already done is real life.

Ive mentioned about proper dimensions model need to meet. Couple of people tryied to help and I am relly pleased about it.Tthey've done the model in the right way, but the flat pattern doesnt show start rolling line- thats the only one thing missing to make it right.

What is your point to digg in wrong oval model?

[JDMather]

Oops, I missed the dimensions given in the first post.
Looks pretty straight forward to me, not sure I understand the problem.
Wiil the part made from two sheets of metal?
Is the only problem finding the beginning centerline to start the bend?

[autodesk-MM]

Is not that really straight forward, because rolling sheet will stretch the flat pattern a little bit and add some milimiters to the lenght. Using lofted flange with press breake command inventor will peak the details youve entered for your bending tool. If you use lofted flange with die formed option youll get a nice shape but the flat pattern wont show any start point because inventor didnt use any tool to build that model. Those milimiters Ive mentioned are in perfect world so YES I need the start line only.

Thank you for your time

[JDMather]

Ahh, I see.
The sheet metal I've been involved with had liberal tolerances and the guys out on the shop floor were very good at getting desired results with minimal information - artist they were.