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3D Options: Material Condition

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: 3D Models
Forum Description:
URL: http://www.PCBLibraries.com/forum/forum_posts.asp?TID=3207
Printed Date: 16 Jul 2024 at 1:43pm


Topic: 3D Options: Material Condition
Posted By: dramos
Subject: 3D Options: Material Condition
Date Posted: 09 Jan 2023 at 2:26am
Hi to all,

I cannot understand very well the meaning of the parameter Material condition (Least, Nominal, Most).
Which is the meaning of it? Which is the difference?



Is there any relation with the Density Level of the footprint created?
I mean, if I am creating a footprint with Most material condition should I choose the 3D Material condition as Most? 

Regards,
david



Replies:
Posted By: Tom H
Date Posted: 09 Jan 2023 at 9:42am
There are 3 columns of dimensional data in the Footprint Expert component family calculators. 

Nom / Min / Max and when you select a Material Condition, the 3D STEP output will use the column of data that you select. The default setting is "Nominal" material condition. 


 


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Posted By: dramos
Date Posted: 10 Jan 2023 at 12:12am
Dear Tom,

Many thanks for your fast answer. 

Regards,
David


Posted By: boardrouter
Date Posted: 10 Feb 2023 at 8:57am
These refer to the +/- tolerance of the feature:

Least = the minimum dimension 
Nominal = the midpoint between least and most
Most = the maximum dimension

Example 1 (symmetrical tolerance):
3.57 +/-0.10
Least= 3.47
Nominal= 3.57
Most= 3.67

Example 2 (asymmetrical tolerance): 
3.67 +0.000/-0.20
Least= 3.47
Nominal= 3.57
Most= 3.67

Typically the nominal value is the stated dimension where the + and the - tolerances are equal, as in Example 1.




Posted By: Tom H
Date Posted: 10 Feb 2023 at 11:49am
The Nominal density level is the most popular in the commercial industry. 

Military weapons contractors seem to use the Maximum density level for 3D models. 

Least is never used by anyone. 



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