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December 2003

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Subject:
From:
"Blair K. Hogg" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 12 Dec 2003 08:47:30 -0500
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In addition you may also want to collect and analyze variables related to your processes. If you have the equipment for it, some things to consider are:

Solder paste height or volume - are you consistently getting the right amount of paste on the board?

Oven temperatures - is your oven performing consistently keeping the process in control?

DPMO/PPM calculations are good to give an overall performance indication of the processes, but what is important is that you analyze the data - use a pareto analysis to identify your major problems, root cause analysis to identify the cause and corrective action to eliminate the cause. Check IPC-7912 (order from the IPC web site) for more info on DPMO calculations.

Blair Hogg
QA Manager 
GAI-Tronics Corporation

>>> [log in to unmask] 12/12/03 07:36AM >>>
        Prashant:
        Defects per million opportunities or DPMO. Do a search on the
internet for DPMO or PPM and you will different organization that provides
software for this purpose.
        Regards,
        Ramon

> -----Original Message-----
> From: TechNet [SMTP:[log in to unmask]] On Behalf Of pras chop
> Sent: Thursday, December 11, 2003 10:45 PM
> To:   [log in to unmask] 
> Subject:      [TN] SPC controls
>
> Hi,
>
> hello again guys....now everybody must be in mood for christmas!!!!!
>
> I have a query and require your inputs....
>
> What are the SPC tools that we can use in our SMT line to keep a check and
control on our different processes like paste printing,component
placement,reflow,wave etc.
>
> Is there any website where I can get any info abt this or maybe some
literature from you guys.
>
> Please mail me on my e-mail ID.
>
> rgds
> Prashant Chopra
>
> Manufacture Engineer
> Jabil
>
>
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