TECHNET Archives

December 2000

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Jowan Iven <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 6 Dec 2000 17:20:59 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (141 lines)
Mark,

Its pure smt placement before reflow (including some programming errors ).
And its based on the number of components.
But all the detected defects before reflow/curing wil be corrected before sending them through.
So DPMO for post reflow is different and typical much lower.

I have to admit we started above 500 DPMO using our own method.
But lately 100 DPMO is standard after several improvements in the process.
Don't know if it can be compared with your 50dpmo.

I was just stating that the constant drive for a lower dpmo will bring succes to almost any method.
It's nice to have an industry standard though.


Missing the input from other members too.


Jowan  Iven
Process  Engineer  Manufacturing
Stork Electronics




-----Original Message-----
From:   Mark Orlowski [SMTP:[log in to unmask]]
Sent:   Wednesday, December 06, 2000 4:30 PM
To:     [log in to unmask]
Subject:        Re: [TN] Assembly DPMO Benchmarks or Targets

Jowan,

Thanks for the reply.  Hopefully, the industry will converge on the
IPC-9261 standard for process DPMO calculations once it is released.  I
understand it is currently in review.

Is the 500 pre-reflow DPMO target  you use just for SMT placements?  We
currently use a target of 50 DPMO for post-reflow, which includes solder
joints and placements as opportunities.  We understand that is a typical
best-in-class benchmark.

I hope some other forum members pitch in some info.  Thanks again.

Mark




                    Jowan Iven
                    <[log in to unmask]        To:     "'TechNet E-Mail Forum.'"
                    group.com>              <[log in to unmask]>, "[log in to unmask]"
                                            <[log in to unmask]>
                    12/06/2000 01:53        cc:
                    AM                      Subject:     RE: [TN] Assembly DPMO Benchmarks or
                                            Targets






Hi Mark,

I was strugling with the same question in the past.
After some research we found out that everybody has its own way of
measuring.
So it is impossible to compare the targets.

More important is to set up a method for your own productionenvironment.
Determine the DPMO in your factory  with your method.

Then set a realistic target and keep on working to get there.
Once you've reached the target you can set a new one.


But if you like to hear a number ;  for SMA prereflow we used 500 dpmo to
start with.

Hope this helps a little



Jowan  Iven
Process  Engineer  Manufacturing



-----Original Message-----
From:           Mark Orlowski [SMTP:[log in to unmask]]
Sent:           Tuesday, December 05, 2000 7:45 PM
To:        [log in to unmask]
Subject:        [TN] Assembly DPMO Benchmarks or Targets

Hey all,

I'd like to hear what some other folks are using for numeric DPMO targets
for assembly processes, such as:

SMT placement and/or reflow
Auto PTH insertion
Manual PTH insertion
Wave solder
Manual solder

We adhere to the preliminary IPC-9261 standard for calculation and now want
to benchmark the results.  Thanks.

Mark

---------------------------------------------------------------------------------

Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------

ATOM RSS1 RSS2