Holes in cylinder surface (not from a flat plane)

[NachitoMax]

Hi

I need to put some holes in a cylinder face but not using the method of a tangent flat surface with a hole as the result is incorrect.

Imagine the panel started out flat and I drilled some holes. Then I rolled the panel to a cylinder. The resulting hole would not be a standard hole as drilled on the cylinder surface as the outside perimeter would differ from the inside perimeter. If I drill a hole on the cylinder surface then try to flatten it out, first I cant flatten it because the hole irregular to the thickness but also, I would get a non circular perimeter.

Sooooo, what's the best way to do it? Is there a magical way to do this on the cylinder surface or am I beat to unfold it, put the holes I'm then refold it?

Thanks

[j.palmeL29YX]

What do you have (post an .ipt) and what do you want to get (post a sketched pic of the final model).

[JDMather]

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@NachitoMax wrote:

Imagine the panel started out flat and I drilled some holes. Then I rolled the panel to a cylinder. ...

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1. No need to imagine, you can do it the same way in Inventor.

2. Another alternative might be to project (wrap) circle in 3D sketch to cylindrical surface body, Split and then Thicken.

3. A third alternative might be to Project Flat Pattern, add circle then Cut Across Bend.

What version of Inventor are you using?

If you stated your version or posted an attempt - I could demonstrate all three techniques.

[NachitoMax]

Hi

I'm using 2019 at the minute. I'll post an example when I get home, I'm mid travel atm

Thanks 

[johnsonshiue]

Hi Nigel,

This is a case of competing requirements. Though in reality it is highly doable, on a CAD system like Inventor is an almost impossible task. Essentially, you want the CAD model to behave more like real material. Unfortunately, it does not do that.

I guess you have to pick one requirement and use it as a single source of truth. And, likely you will need more than one part to fulfill other requirements. At the moment, there is no solution to satisfy two requirements within one part.

Many thanks!

[IgorMir]

Helo Nigel;

Here is the thing.

If you need the holes on a rolled part to be true after you rolled the part up - you will have to grab an electrical drill and true them all manually. Wouldn't you not? So, with that in mind, if you want to have your holes true on the roleld part - you need to array the hole again. But that, inevitably - will affect the flat pattern. In such a case - I would use and iPart route. One of the child would represent a complete design (with true holes on the rolled surface) and another one would be used for producing the flat pattern. Alternatively - you can use Derive technique.

Cheers,

Igor.

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@NachitoMax wrote:

Hi

I need to put some holes in a cylinder face but not using the method of a tangent flat surface with a hole as the result is incorrect.

Imagine the panel started out flat and I drilled some holes. Then I rolled the panel to a cylinder. The resulting hole would not be a standard hole as drilled on the cylinder surface as the outside perimeter would differ from the inside perimeter. If I drill a hole on the cylinder surface then try to flatten it out, first I cant flatten it because the hole irregular to the thickness but also, I would get a non circular perimeter.

Sooooo, what's the best way to do it? Is there a magical way to do this on the cylinder surface or am I beat to unfold it, put the holes I'm then refold it?

Thanks

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[S_May · Accepted solution]

Hi @NachitoMax