topic Re: Truncated Cone Development in Inventor Forum

Truncated Cone Development

MikeKovacik4928 — Mon, 26 Apr 2021 15:11:11 GMT

Hi all inventor users world wide.

I'm sure lots of you have already done this many times before

I need you to share with me how you develop a truncated cone using inventor sheet metal.

In the days before computers, on the drawing board, I used to do this from first principles.

I have long ago forgotten that, and could look it up again in my old books and notes.

However there is no point these days, as the software now does everything for you, you no longer

have to think or know first principles!!

See attached. How would I flat pattern this?

Mike Kovacik

Inventor Pro 2018

South Africa

Re: Truncated Cone Development

mcgyvr — Mon, 26 Apr 2021 15:24:49 GMT

Quite a few youtube videos/tutorials on the subject..

https://www.youtube.com/watch?v=N-dX2qd3rCQ

Re: Truncated Cone Development

JDMather — Mon, 26 Apr 2021 16:50:32 GMT

@MikeKovacik4928 wrote:

...you no longer have to think or know first principles!!

You do to pass my classes. 🎓

1st principle, the edges should be perpendicular to the flat (yours are not).

One of the 4 rules of sheet metal.

Re: Truncated Cone Development

johnsonshiue — Mon, 26 Apr 2021 18:31:22 GMT

Hi Mike,

This case should have been done using Lofted Flange -> Rip. Or, Loft (surface) -> Thicken -> Rip. The Solid Loft may not yield the perfect geometry required to unfold.

Many thanks!

Re: Truncated Cone Development

karthur1 — Mon, 26 Apr 2021 20:30:03 GMT

@MikeKovacik4928 wrote:

Hi all inventor users world wide.

.....

See attached. How would I flat pattern this?

Mike Kovacik

Inventor Pro 2018

South Africa

There are several ways you can model this. Revolved a surface, Thickened, then generated the flat. If you do not revolve the full 360°, then you do not have to split it.

Kirk

Re: Truncated Cone Development

MikeKovacik4928 — Tue, 27 Apr 2021 17:36:17 GMT

Thanks

Amazingly easy when you know how and have done it before!!

Mike

Re: Truncated Cone Development

MikeKovacik4928 — Tue, 27 Apr 2021 17:41:51 GMT

Thanks

I cannot open your file, it is a newer version of Inventor than I am using (Inventor 2018).

I have however discovered how do it now.

Mike

Re: Truncated Cone Development

MikeKovacik4928 — Tue, 27 Apr 2021 17:45:52 GMT

Thanks

I see what you are talking about, I will bear that in mind in the future.

What are the other 3 rules?

Mike

Re: Truncated Cone Development

MikeKovacik4928 — Tue, 27 Apr 2021 17:48:12 GMT

Thanks Johnson

I see that now

Thanks to all for your replies.

Mike

Re: Truncated Cone Development

JDMather — Tue, 27 Apr 2021 19:37:18 GMT

@MikeKovacik4928 wrote:
What are the other 3 rules?

1. Sheet metal is uniform Thickness

2. Bends are cylindrical or conical (except for Lofted Flange)

3. Cuts are perpendicular to the flat.

4. Flange faces are planar (except for Lofted Flange)

5. Flanges cannot intersect in folded or flat

6. In general, model in finished form rather than folding from flat.

https://www.youtube.com/watch?v=BAa6J0Pigp0