Derived part not creating flat pattern

[dwgESGWF]

Hello, I created a derived mirrored part from a Sheet Metal part I had. I see it inherits the sheet metal style and everything as it should, but it doesn't want to generate a flat pattern. It just shows the part as it is. The thing is that the original part has a couple of holes that the mirrored one doesn't, so that's why I need to have two separate parts.

[kacper.suchomski]

Hi

The sheet thickness in the rule is different from the model thickness. The value must be identical.
Fix the sheet settings and the flat pattern will work.

[JDMather]

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@dwgESGWF wrote:

I see it inherits the sheet metal style and everything as it should

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@dwgESGWF 

When I go into the Sheet Metal Styles it is set to different Thickness than the part.

When I set to correct Thickness - it flattens.

Interestingly though, the original file is also set to incorrect Thickness but it flattens.

Somewhere it looks like it was a conversion from inch to mm issue.

[johnsonshiue · Accepted solution]

Hi! I believe there is a unit confusion issue in the Sheet Metal Style. The sheet metal parts are in mm but the active Sheet Metal Rule does not specify the Thickness unit. As a result, the Thickness seems to be derived as mm but the actual body thickness is 0.075 in.

I have reset the parts' unit to inch so that they are all in sync. Please take a look at the attached file.

Many thanks!

[dwgESGWF]

Thank you! Yeah, this thing of mixing units gets complicated when things are in mm but manufacturing needs inches. Thank you all for your help. Learning something new every day