[PCB_FORUM] Re: Component Heights?


We always developed our solder paste apertures as ovals and smaller than the 
copper pad so there isn't enough solder volume which would cause the component 
to be raised off the PCB.  We also rounded up the max component height to the 
nearest 10 mils to avoid creating many multiple footprints, especially with 
discrete components where you would have multiple vendors for the same part 
number.  We would add the actually height in the PTF files and it push forward 
into Allegro for reference and only use the max height defined in the Allegro 
symbol.   Your little script sound pretty cool and certainly will better 
represent the component height at the board level. 





Hope this helps, 

Mike Catrambone 



----- Original Message ----- 
From: "Shirley Bradley" <shirley.bradley@xxxxxxxxxxxx> 
To: icu-pcb-forum@xxxxxxxxxxxxx 
Sent: Wednesday, March 25, 2009 1:15:06 PM GMT -06:00 US/Canada Central 
Subject: [PCB_FORUM] Re: Component Heights? 

What is everyone using for the "float" height? 

Shirley from Iowa 

-----Original Message----- 
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Gary Carter 
Sent: Wednesday, March 25, 2009 12:55 PM 
To: icu-pcb-forum@xxxxxxxxxxxxx 
Subject: [PCB_FORUM] Re: Component Heights? 

Don't forget to allow for "float" height in your soldering process when 
setting the max height value. 

Bolman, Shirley H wrote: 
> 
> We have been adding the MAX package height to physicals for years. In 
> addition we add the max height to every line entry 
> 
> in the part.ptf files. This is because some mfg create an 0603 
> resistor at .026 high and someone else may create it at .022. 
> 
> We have a script that will read the HEIGHT field from the part.ptf and 

> replace the actual max height on a part number basis. 
> 
> So after the script is run, a board may have two 0603 resistors side 
> by side but one is 26 mils tall and the other is 22. 
> 
>   
> 
> 
> Shirley 
> 
> It is a*/ PRIVILEGE/* to be born free. 
>     It is a*/ RIGHT/* to live free. 
>         It is a*/ DUTY/* to die free. 
> 
> ---------------------------------------------------------------------- 
> -- 
> 
> *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx 
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of 
> *ameehan@xxxxxxxxxxxxxx 
> *Sent:* Friday, March 20, 2009 7:15 PM 
> *To:* icu-pcb-forum@xxxxxxxxxxxxx 
> *Subject:* [PCB_FORUM] Re: Component Heights? 
> 
>   
> 
> Thanks very much - we'll give this a try! 
> 
> -----Original Message----- 
> From: Bill Dempsey 
> Sent: Mar 20, 2009 10:04 PM 
> To: icu-pcb-forum@xxxxxxxxxxxxx 
> Subject: [PCB_FORUM] Re: Component Heights? 
> 
> 
> Be sure to have a PLACE_BOUND_TOP (and bottom if needed) shape on the 
> package.  Setup the height under Setup->Areas->Package Height 
> 
> When you export the symbols with IDF the package height on that shape 
> is exported with the symbol.  Works quite nicely. 
> 
>   
> 
> *From:* icu-pcb-forum-bounce@xxxxxxxxxxxxx 
> [mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] *On Behalf Of 
> *ameehan@xxxxxxxxxxxxxx 
> *Sent:* Friday, March 20, 2009 8:52 PM 
> *To:* icu-pcb-forum@xxxxxxxxxxxxx 
> *Subject:* [PCB_FORUM] Component Heights? 
> 
>   
> 
> Is anyone using a component height property on Allegro package or 
> mechanical symbols? What is the correct syntax (we're using 16.2)? We 
> haven't done that here, and I can't find any guides on Sourcelink. 
> 
> The plan is to add the height at the package symbol level and export 
> it to SolidWorks using IDF. Has anyone out there had success with this 

> method of checking for comp-to-enclosure violations? Thanks for any 
> info you can provide. 
> 
> Alexis Meehan, Opnext, Inc. 
> 
> ----------------------------------------------------------- To 
> subscribe/unsubscribe: Send a message to 
> icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or 
> unsubscribe To view the archives of this list go to 
> http://www.freelists.org/archives/icu-pcb-forum/ Problems or 
> Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx 
> ----------------------------------------------------------- 
> 
> ----------------------------------------------------------- To 
> subscribe/unsubscribe: Send a message to 
> icu-pcb-forum-request@xxxxxxxxxxxxx with a subject of subscribe or 
> unsubscribe To view the archives of this list go to 
> http://www.freelists.org/archives/icu-pcb-forum/ Problems or 
> Questions: Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx 
> ----------------------------------------------------------- 
----------------------------------------------------------- 
To subscribe/unsubscribe: 
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx 
with a subject of subscribe or unsubscribe 

To view the archives of this list go to 
http://www.freelists.org/archives/icu-pcb-forum/ 

Problems or Questions: 
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx 
----------------------------------------------------------- 
----------------------------------------------------------- 
To subscribe/unsubscribe: 
Send a message to icu-pcb-forum-request@xxxxxxxxxxxxx 
with a subject of subscribe or unsubscribe 

To view the archives of this list go to 
http://www.freelists.org/archives/icu-pcb-forum/ 

Problems or Questions: 
Send an email to icu-pcb-forum-admins@xxxxxxxxxxxxx 
-----------------------------------------------------------

Other related posts: