Axial LeadForm Calculator

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   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, 

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victorp06 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 22 Apr 2021 Status: Offline Points: 3	Post Options Post Reply Quote victorp06 Report Post Thanks(0) Quote Reply Topic: Axial LeadForm Calculator 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,



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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
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victorp06 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 22 Apr 2021 Status: Offline Points: 3	Post Options Post Reply Quote victorp06 Report Post Thanks(0) Quote Reply Posted: 22 Apr 2021 at 4:38pm
	Thanks you so much Tom! I'll definitely download the new version.