John:
Every situation is different. Some assembling operations are so
relax and dependant on rework that it becomes part of their standard
operation. It could be equipment is not kept up or operators are not given
the proper tools or something else. It takes a mind set change. It should
start from the top and in stages. I would convince the managers of the need
for a change first. Explain the plan to the operators. I would start with
a single type of board, work out all the bugs, help people start thinking
building assemblies right the first time. Then continue with the rest of the
boards. If you try to eliminate a step over night, there may be a riot and
a lot of bad boards. Operators need to be part of the solving equation.
From experience
Ramon
> -----Original Message-----
> From: Dale Ritzen [SMTP:[log in to unmask]]
> Sent: Wednesday, December 03, 2003 4:53 PM
> To: [log in to unmask]
> Subject: Re: [TN] Touchup - We don't need no stinkin' touchup! Or do
we?
>
> This is all predicated on the fact that you have a good
> validation/functional test after the reflow or solder wave operation. I
> would not presume to trust an ICT test (unless you have 99% coverage - and
> that is almost an impossibility depending on assembly structure and
> topography). Plus, as not all functional tests are created equal, there is
> still a valid need for a visual inspection with potential rework at some
> point before a final audit of the product is performed.
>
> Visual inspections may not to be implemented until you reach a specified
> failure threshold, but they do serve a good purpose to pick up the slack
> from equipment anomalies, hand solder mistakes and other nonconformities.
> Unfortunately, as long as there are people handling product or performing
> hand operations to the product (with or without a soldering iron), and
aging
> equipment there will be a valid need for visual inspections at certain
steps
> in the manufacturing process, with subsequent rework and re-inspection.
>
> Dale Ritzen, CQA
> Quality Manager
> Austin Manufacturing Services
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Dobbs, Marie
> Sent: Wednesday, December 03, 2003 2:43 PM
> To: [log in to unmask]
> Subject: Re: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
>
>
> My two cents
> I would recommend 100% inspect on all boards after they fail, if they fail
> testing. To pay an employee to sit and look at a board 100% after a
machine
> operation is a huge Non-value activity, and the Annual dollar value.
> Marie
>
> -----Original Message-----
> From: John Parsons [mailto:[log in to unmask]]
> Sent: Wednesday, December 03, 2003 3:36 PM
> To: [log in to unmask]
> Subject: Re: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
>
>
> Bev,
>
> Thanks for the input. I have yet to evaluate the actual amount of rework
> per board or per lot but right know I am questioning the necessity of the
al
> process of 100% inspecting the boards after reflow prior to second stage
> operations.
>
> John
>
> -----Original Message-----
> From: Bev Christian [mailto:[log in to unmask]]
> Sent: Wednesday, December 03, 2003 12:06 PM
> To: TechNet E-Mail Forum.; John Parsons
> Subject: RE: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
>
> John,
> Avoid at all costs. Every time a human takes a soldering iron to a board
> you run the risk of decreasing the reliability of the finished product.
> Rework should never be a "standard process step after smt". This does not
> mean it never happens, but not every board, every day.
>
> regards,
> Bev Christian
> Research in Motion
>
> -----Original Message-----
> From: John Parsons
> Sent: December 3, 2003 2:52 PM
> To: [log in to unmask]
> Subject: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
>
>
> Greetings all,
>
> I have moved on from my old life in the fabrication business to learn
some>
> new things in the contract manufacturing sector. My first question to the
> group in this new role is on the subject of touch-up as a standard process
> step after smt placement and reflow. Does everyone do this or can it be
> eliminated by process control during placement and reflow? I personally
> don't much care for non-value added processes but was just wondering what
> the general feeling out there was.
>
> Regards
> John Parsons
>
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