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What is spec on stretch????

Hi, ... - Apr 16, 1999 by Justin Medernach  

Justin Medernach

#11914

What is spec on stretch???? | 16 April, 1999

Hi,

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Justin Medernach

#11915

Re: What is spec on stretch???? | 16 April, 1999

| Hi, | I just cheesed my previous attempt at this. I looked through IPC 600 and couldn't find anything relating to dimensional stability of a board with regard to stretch. I found bow and twist but nothing on size. I have a PCB that is .030" over size in the width. THe width should be 3.540" and I've got 3.570". Sorry about the podunk request but I'm kind of stuck.

Thanks, Justin

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#11916

Re: What is spec on stretch???? | 16 April, 1999

| | Hi, | | I just cheesed my previous attempt at this. I looked through IPC 600 and couldn't find anything relating to dimensional stability of a board with regard to stretch. I found bow and twist but nothing on size. I have a PCB that is .030" over size in the width. THe width should be 3.540" and I've got 3.570". Sorry about the podunk request but I'm kind of stuck. | | Thanks, | Justin | Justin: We use IPC-A-600 to the determine that a board looks correct and use IPC-D-300G, Printed Board Dimensions and Tolerances to cover dimensioning and tolerancing requirements boards. Standard manufacturing tolerances are:

Greatest Board/Panel Dimension Class 1 Class 2 Class 3 Up to 300 (12.00) 0.70 0.50 0.30 (0.028) (0.020) (0.012) More than 300 (12.00) 0.85 0.60 0.40 (0.034) (0.024) (0.016)

Good luck

Dave F

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Justin Medernach

#11917

Re: What is spec on stretch???? | 19 April, 1999

| | | Hi, | | | I just cheesed my previous attempt at this. I looked through IPC 600 and couldn't find anything relating to dimensional stability of a board with regard to stretch. I found bow and twist but nothing on size. I have a PCB that is .030" over size in the width. THe width should be 3.540" and I've got 3.570". Sorry about the podunk request but I'm kind of stuck. | | | | Thanks, | | Justin | | | Justin: We use IPC-A-600 to the determine that a board looks correct and use IPC-D-300G, Printed Board Dimensions and Tolerances to cover dimensioning and tolerancing requirements boards. Standard manufacturing tolerances are: | | Greatest Board/Panel Dimension Class 1 Class 2 Class 3 | Up to 300 (12.00) 0.70 0.50 0.30 | (0.028) (0.020) (0.012) | More than 300 (12.00) 0.85 0.60 0.40 | (0.034) (0.024) (0.016) | | Good luck | | Dave F | Dave, Thanks a bunch, man.

Regards, Justin

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