I personally feel that the second table obviates the need for re-visiting

the old one.



Lionel.



From:     John Perry <[log in to unmask]>@ipc.org on 10/21/2003 03:54 PM EST

Please respond to "(Combined Forum of D-33a and 7-31a Subcommittees)"

<[log in to unmask]>

Sent by:  IPC-600-6012 Mail Forum <[log in to unmask]>



To:  [log in to unmask]

cc:



Subject:  [IPC-600-6012] Teleconference on IPC External Copper Foil

Minimums











Colleagues,







One of the final hurdles in the completion of Revision B for the IPC-6012

Qualification and Performance Specification for Rigid Printed Boards is the

updating of Table 3-8, External Conductor Thickness after Plating.







A proposal was made at Expo 2003 to rebuild the table using Maximum

Variable Processing Allowance Reductions, thereby increasing some of the

minimum thickness requirements.? These new thickness requirements are based

on changes to the existing processing allowance reductions, which were

extracted from the table earlier this year.? Agreement could not be reached

in the time allotted but several questions were posed, including:







Is there still a need for Table 3-8 when Table 3-2 provides minimum

surface/hole plating values?



In the case of Table 3-8, what if all weights used the same processing

allowance?







We will be holding a teleconference to continue discussion on this table on

Wednesday, October 29th at 2PM Eastern, 11AM Pacific.? I would like for us

to use this forum as a means to submit comments between now and then, at

which time I will compile all the comments and make them available for the

teleconference.







To access the teleconference, please dial 1-620-584-8200 and enter the

passcode of 3366# when prompted by the audio beep.







To access the Table 3-8 proposal, visit the IPC Committee Home Page,

located at







http://www.ipc.org/Committeepage.asp. The IPC-6012B External Copper Foil

Table Proposal is available in Excel format.







When accessing this page, please select the "+" button to the left of the

D-30 Rigid Printed Board Committee link, which expands to all the task

group links below, and then select the D-33a Rigid Printed Board

Performance Specification Task Group link.? Once you are at the web page

for this task group, select the "Draft" link and you can download the Excel

file.







If you have problems accessing the file please contact me at [log in to unmask]

and I will send you a copy outside of this e-mail forum.







Regards,







John Perry



Technical Project Manager



IPC



[log in to unmask]



1-847-790-5318



Visit www.ipc.org/annualmeeting?for Tech session and standards committee

meeting dates and times