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3D Model Generated in Maximum Body Size

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Arun7290 View Drop Down
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    Posted: 18 Mar 2021 at 11:08am
Hi,
I generated 3D step file for a QFN package in Footprint Expert BETA v2021.13. 

The 3D step file is getting generated in the package's Max size only. 

I even had the material condition in Nominal in the "Build Footprint" wizard. But still I get the 3D file in the Max size only.

Refer the below component body dimensions.


And below is the generated 3D file.



As per the datasheet, the component leads in the sides will also be included within the nominal body dimension of 8mmX8mm. 

But the 3D file looks as if the leads from the sides have a some thickness resulting in the Max size of the component body.

Is there any way to have the component body size in the nominal size itself (as given in the Datasheet) in the 3D STEP file ?

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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 2021 at 11:39am
You can control the 3D STEP Model material condition for the body here, but the Height will always be maximum. 


 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Arun7290 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 2021 at 6:30am
Hi,
I had the Material condition as "Nominal" only. But still the length and width of the 3D file is generated in the Max size only. This is because the component leads in the sides are extending a bit from the component body(Highlighted in red in the below 3D image). It should actually be within the component body dimension of 8mmX8mm as shown in the datasheet dimension below.



Can we control this dimension in 3D ?
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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 2021 at 8:25am
The Terminal Leads could be the issue. 

We must extend the Terminal Leads outward (outside the body) because when we Extrude the leads into the Body the STEP file size quadruples and our users complained about that. 

Extruding Leads into the body cavity creates hundreds of additional coordinates in the STEP file. 

So to reduce the STEP file size to the bare minimum, we do not extrude any body cavities. All the terminal leads are on the surface of the body. 

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