Inventor 2018 Lofted Flange Bend Lines Missing On Flat Pattern?

[jletcher]

Where is my bendlines?

kelly.young has edited your subject line for clarity: 2018 bendlines missing?

[Thomas_Savage]

Hello @jletcher

Did you select Die formed on the Lofted Flange?

As this will not show bend lines.

You need to select Press Brake.

Then you will get bend lines.

Thomas.

[Thomas_Savage]

I created a quick screencast to show you. 

This could be your problem. Using Die Formed, instead of Press Brake.

Thomas. 

[jletcher]

That is lame..

Seeing it wants to take a hem and make it 3 bends not one and change what I want..

What it should be.

So another half baked feature.. Time to find workaround..

 Thanks for the reply..

[johnsonshiue]

Hi James,

Indeed, the behavior is a bit confusing. I also agree there is room for improvement in Lofted Flange, in terms of the resultant body and acceptable input geometry. In this case, the workaround is to make the Hem sketch geometry construction lines. So that the Lofted Flange only creates the big faces. After that, create Hem features separately.

Many thanks!

[Thomas_Savage]

@jletcher

I think the lofted flange does not see the that bend as a hem.

So it makes the bend out of more than one bend.

This is what it looks like to me.

Add the Hem after you have done the lofted flange.

Thomas.

[kelly.young]

@jletcher would an acceptable workaround be to turn on the Bend Extents of the Drawing View?

You can select the lines you want and either turn off the visibility or put on a different layer for thickness/type.

This way you can use the modeling technique you want and still get your bend lines.

Hope that helps!

Please select the Accept as Solution button if a post solves your issue or answers your question.

[jletcher]

 Thanks good idea but will not be acceptable they would need bend line.

 I know I could make sketch do this do that but if they have to do all that they might as well keep it in Autocad..

 But this is part of the frustration with Autodesk. I would almost bet someone mention this before and it is not fixed..

I am not even sure why it was a mess up in the 1st place.

Hem tool does not make it into 3 bends so why would you make it 3 in a loft?

Oversight? overlooked? But yet no fix..

 I just made it the old fashion way who was I to think a feature would make it faster..

But thanks for all the replies

[S_May]

Hi @jletcher,

[jletcher]

Thanks but those are tangents not bendlines. I need the bendlines for press brake operator..

 The question marks is a tear that is how Inventor handles it..

[Thomas_Savage]

Hello @jletcher

If your part is being bent by Press Brake then do it the way i shown in my screencast.

When creating the lofted flange, select Press Brake.

Then add the Hem after.

Then you will get the bend lines in the .idw

This is the way i would do it. And you will have no problems this way.

Thomas.

[jletcher]

I don’t use half baked features.

if it don’t work right on a hem I’m afraid there will be more surprises so I’ll do it the old fashion way to be safe.

I appreciate your idea thanks I am sure others will find it helpful. 

[Thomas_Savage]

You're Welcome @jletcher

Hope you get the result you want doing it the old fashioned way.

Thomas.

[llorden4]

Ever find a solution/work around for this?  I'm in the same boat.

[johnsonshiue]

Hi Leo,

For Die-Form Lofted Flange, there are no bend lines because the radius can keep changing. The reason why it can be unfolded is because the direction and value of radius change are linear.

You will need to create the bend lines in flat pattern manually using Cosmetic Bend Lines command.

Many thanks!