PCB Libraries Forum : Axial LeadForm Calculator https://www.PCBLibraries.com/forum/ Mon, 20 Apr 2026 19:36:07 +0000 Thu, 22 Apr 2021 16:38:30 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2890 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Axial LeadForm Calculator : Thanks you so much Tom! I&#039;ll...]]> https://www.PCBLibraries.com/forum/axial-leadform-calculator_topic2890_post11518.html#11518 Author: victorp06
Subject: 2890
Posted: 22 Apr 2021 at 4:38pm

Thanks you so much Tom! I'll definitely download the new version.]]> Thu, 22 Apr 2021 16:38:30 +0000 https://www.PCBLibraries.com/forum/axial-leadform-calculator_topic2890_post11518.html#11518 <![CDATA[Axial LeadForm Calculator : The Axial Lead Form Calculator...]]> https://www.PCBLibraries.com/forum/axial-leadform-calculator_topic2890_post11517.html#11517 Author: Tom H
Subject: 2890
Posted: 22 Apr 2021 at 3:40pm

The Axial Lead Form Calculator used IPC-2221B. 

Also, there was a bug in the pin pitch that was fixed in the V2020 Library Expert. 

And it's correct in the Free V2021 Footprint Expert Pro. 

Please download and install the Free full featured brand-new V2021.03 Footprint Expert Pro - www.pcblibraries.com/downloads

]]> Thu, 22 Apr 2021 15:40:37 +0000 https://www.PCBLibraries.com/forum/axial-leadform-calculator_topic2890_post11517.html#11517 <![CDATA[Axial LeadForm Calculator : Hi everyone,I&#039;m trying to...]]> https://www.PCBLibraries.com/forum/axial-leadform-calculator_topic2890_post11516.html#11516 Author: victorp06
Subject: 2890
Posted: 22 Apr 2021 at 3:21pm

Hi everyone,

I'm trying to use Axial Leadform Calculator of Library Expert version 2016.08 to calculate the pitch for some components. However, it does not match the value I get from IPC 2221a. 

As per IPC-2221A, the values to calculate the bending radius (R) should be as shown below:

R = 1 * max. lead diameter (when max. lead diameter up to 0.8 mm)
R = 1.5 * max. lead diameter ( when max. lead diameter from 0.8mm to 1.2mm)
R = 2 * max. lead diameter ( when max. lead diameter larger than 1.2 mm)

However, when checking Library Expert Axial Leadform Calculator the values are calculated as below:

R = 1.5 * max. lead diameter (when max. lead diameter up to 0.8 mm)
R = 1 * max. lead diameter ( when max. lead diameter from 0.8mm to 1.2mm)
R = 2 * max. lead diameter ( when max. lead diameter larger than 1.2 mm)

Why is that difference? Is Library Expert using a different IPC version?

Additionally, the minimum lead length extension value is calculated as 1.5 * max. lead diameter but I could not find the formula in IPC-2221a. How did you reach to this formula?

Thanks for all your help, Smile
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