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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 12 Dec 2003 06:39:34 -0800
Content-Type:
text/plain
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text/plain (190 lines)
        Ioan
        My experience tells me that under 1000 is good. It also depends on
the volume and mix. It would be easier to control defects if it was high
volume and low mix and all parts are put by the machine and all are SMT. If
you add hand place components, conductive paste under the components, CC,
heat sinks bonded to the board, mix technology and so on it can be very
difficult.
        Regards,
        Ramon

> -----Original Message-----
> From: Tempea, Ioan [SMTP:[log in to unmask]]
> Sent: Friday, December 12, 2003 9:06 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] SPC controls
>
> Hi,
>
> OK, we know the tools, we figure out how to implement them, but what are
we
> looking for? What are the industry levels in terms of DPMO? I have heard
> rumors that below 100 DPMO it is world class manufacturing, but is it
true?
> What are some realistic figures that you guys manage to control?
>
> Thanks,
> Ioan
>
> > -----Original Message-----
> > From: Blair K. Hogg [SMTP:[log in to unmask]]
> > Sent: Friday, December 12, 2003 8:48 AM
> > To:   [log in to unmask]
> > Subject:      Re: [TN] SPC controls
> >
> > 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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