[PCB_FORUM] Re: radial or polar pin placement

Hi Jean,

Thanks for your response.

This will not work due to incremental angle and accumulated error.  Try it, in 
my example place 140 pins radially.  You will see that the quadrant pins, 90, 
180, 270 degrees are in the wrong place.  this error increases the larger the 
radius, the higher the pin count.

Randy

Subject: [PCB_FORUM] Re: radial or polar pin placement
Date: Fri, 10 Apr 2009 10:35:51 -0700
From: jean.bratton@xxxxxxxxxxxxxx
To: icu-pcb-forum@xxxxxxxxxxxxx



















When you are in the add pin mode, there’s a polar option. You
set all the increments, select the center and then the offset (radius of the
circular pattern) and I plops the pins down at the right spot

 



 



Jean Bratton

Senior PCB Designer

Freedom CAD Services, Inc.

Office: 603-864-1349

Email: jean.bratton@xxxxxxxxxxxxxx

Visit us at http://www.freedomcad.com

 



 





From:
icu-pcb-forum-bounce@xxxxxxxxxxxxx [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] 
On
Behalf Of Randy Dawson

Sent: Friday, April 10, 2009 1:05 PM

To: icu-pcb-forum

Subject: [PCB_FORUM] radial or polar pin placement





 

Hi all,



Perhaps there are some of you also doing probe cards...



How do you place a radial array of pins in a symbol?



The system provides a radial copy, with a count and increment.  of course
this wont work, due to accumulated error of the incremental method.

What I am looking for, is a function similar to autocad's radial array, where
you give it the pin count (140 in my case) and the angle to fill, (360).



This places the objects evenly around the circle of a given diameter.  



How do you guys do it?



It would be a great feature to add to Allegro, along with the capability for a
polar grid.



Thanks,



Randy 







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