PCB Libraries Forum : Missing Tolerances https://www.PCBLibraries.com/forum/ Wed, 15 Apr 2026 02:15:35 +0000 Wed, 18 Feb 2015 10:31:53 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=1561 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Missing Tolerances : Good information, Tom!Thanks...]]> https://www.PCBLibraries.com/forum/missing-tolerances_topic1561_post6342.html#6342 Author: 5not4
Subject: 1561
Posted: 18 Feb 2015 at 10:31am

Good information, Tom!
 
Thanks for the quick response.
 
Roy.
]]> Wed, 18 Feb 2015 10:31:53 +0000 https://www.PCBLibraries.com/forum/missing-tolerances_topic1561_post6342.html#6342 <![CDATA[Missing Tolerances : Tolerances are normally +/-...]]> https://www.PCBLibraries.com/forum/missing-tolerances_topic1561_post6340.html#6340 Author: Tom H
Subject: 1561
Posted: 18 Feb 2015 at 9:52am

Tolerances are normally +/- 0.20 mm for larger dimensions and between +/- 0.10 & 0.15 mm for small dimensions.
 
However, for the Corner Concave component family I tend to use the mfr. recommended pattern.
 ]]> Wed, 18 Feb 2015 09:52:02 +0000 https://www.PCBLibraries.com/forum/missing-tolerances_topic1561_post6340.html#6340 <![CDATA[Missing Tolerances : Is there a &#039;typical&#039;...]]> https://www.PCBLibraries.com/forum/missing-tolerances_topic1561_post6338.html#6338 Author: 5not4
Subject: 1561
Posted: 18 Feb 2015 at 9:07am

Is there a 'typical' tolerance to be used when there is no value given on a datasheet?
 
For example - I need to make a footprint for OSCCC style crystal but no dimension is given for the D1 / E1 values (gap between the feet). 

Nominal values are provided for foot width (X and Y) so the gap between can be calculated easily.

What tolerance should be used for an accurate footprint?
 
Any and all comments welcome and greatly appreciated.
 
Datasheet example
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