Glen,
I have to concur that the Caltex unit seems more suited for production.
We've looked at both and the demo Ersascope we had got 'nicked' in
normal use, making it not very usable. That plus the fact that the
flexibility of the plastic lens on the Caltex unit sometimes aids in
getting into tight spaces would make it my choice for production. In a
lab, either is probably good, but out on the floor you never know how
they're going to be handled.
Rick Thompson
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glenn Woodhouse
Sent: Monday, December 10, 2001 7:35 AM
To: [log in to unmask]
Subject: Re: [TN] BGA Visual Inspection
Greg,
The ERSA is a fine piece of equipment. When considering it you must
take into account the production environment it must survive. The prism
used in the tip is vulnerable to damage (i.e., collisions with
components such as caps and resistors around BGA's). Replacement is
costly and requires sending the tip assembly to ERSA for replacement.
When we evaluated the ERSA Scope a year ago, the repair process was to
provide ERSA with a p.o. (several hundred $'s), they would send out a
loaner tip, you would send your tip to ERSA where it would be repaired
in Germany, weeks later you would receive your tip back and either be
partially credited or additionally billed depending on the extent of the
damage and difficulty of the repair, and then you would send the loaner
back to ERSA. This cumbersome and costly process may have since changed
but you would want to check into this.
There is another scope, the Cal-Tech "Hi-Roc" scope that is very similar
in cost and performance but utilizes easily replaceable (takes minutes
with your own people) plastic prisms. We did a side-to-side comparison
and this is what we ultimately bought. We could not discern any
appreciable difference in optical quality between the two although the
Hi-Roc uses a plastic prism and the ERSA uses a glass one. Because we
were using the scope in a volume production inspection process we
couldn't live with the replacement costs associated with the ERSA.
Within the first couple of months we replaced at least four prisms until
the production shifts got comfortable with the level of delicacy
associated with this type of equipment.
If you will be using your scope in more of a lab inspection environment
with control over who is using the scope and the training they have
received, this level of prism damage likely won't occur, but in my
humble opinion it is still a matter of "when" the prism gets damaged,
not "if".
ERSA has a very nice software package available with their machine that
includes prepopulated component images that display acceptable and
rejectable conditions along with the live image of the part under
inspection, including potential root cause comments. You can add to and
customize this image/comment library for your own criteria and
conditions.
Good Luck,
Glenn Woodhouse
MCMS
Advanced Technology Development
> ----- Original Message -----
> From: "Anderson, Greg (IndSys, GEFanuc, NA)"
> <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, December 07, 2001 8:43 AM
> Subject: [TN] BGA Visual Inspection
>
>
> > > TechNet Friends,
> > > We are looking into visual inspection of BGAs to supplement
> > > our X-Ray inspection. I am somewhat familiar with the ERSASCOPE.
> > > It
> appears
> > > to be a fully developed, well-thought out system, with all the
> > > options
> to
> > > make life easy. It appears that their supplemental tools in fact,
> > > do
> add
> > > value to the endoscope itself. This, of course, comes at a price.
> > > I'm hoping to hear from people who have personally evaluated
> such
> > > tools.
> > > Are all the features of the ERSA truly benefits?
> > > Are there other systems that do what the ERSASCOPE does?
> > > Are
> they
> > > as fully developed as the ERSA?
> > >
> > > Thanks for your help with this one,
> > >
> > >
> > > Greg Anderson
> > > Senior Advanced Manufacturing Engineer
> > > GE Fanuc Automation
> > > Charlottesville, VA 22911
> > > Phone: 434-978-5181
> > > FAX: 434-978-5898
> > > e-mail: [log in to unmask]
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