Alain,
Of course, I agree. What I was pointing out though, is that device is used
in this shop anyway, to gage general plating thickness only, not limited to
a specific hole size.
We know that is we are plating X amount in a 35 mil hole, we should see Y
amount over the other size holes and across the surface.
When we need more precise thickness data, we would cross-section, XRF, etc,
etc.
Franklin
----- Original Message -----
From: Alain Savard <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, March 24, 2000 4:16 AM
Subject: Re: [TN] Measuring plated thru hole copper
> Don't know how to tell you this Franklin, put copper plating in small
> diameter holes (below 0.014") is not the same as in larger holes. In small
> holes, you may get much thicker plating at the surface and near the knee
of
> the hole then what you get near the centre of the hole. Back when we had
our
> in-house plating shop, way back in '97, I had looked into getting such a
> device and found it unreliable at best. It gives a good approximation, but
> it measures an overall average, not the thinnest points. But technologies
> may have changed since I looked into this.
>
> My 2 cents worth,
>
> Alain Savard, B.Sc.
> Chemical Process Analyst
> CAE Electronics Ltd.
> e-mail: [log in to unmask]
>
> -----Original Message-----
> From: Franklin Asbell
> Subject: Re: [TN] Measuring plated thru hole copper
>
> Are you looking for a device to measure thickness on individual holes? O
> overall through hole plating. The CMI device is very accurate at measuring
> hole wall copper thickness.
>
> Yes, it has hole size limitaitons but it's not the actual hole you are
> measuring, right? You might consider adding a few probe holes around the
> panel, the CMI unit works great in that way.
>
> Franklin
>
> ----- Original Message -----
> From: May William D (Dean) CNIN
> Subject: [TN] Measuring plated thru hole copper
>
> > We are looking to buy a hand held unit to measure plated thru hole
copper
> > thickness. I know CMI makes one but it can only measure a minimum hole
> size
> > of 35 mils. Are there any other vendors out there that make hand held
> > units.
> >
> > Would appreciate any information.
> >
> > Thanks!
> >
> > Wm. Dean May
> > NSWC Crane
> > Bldg. 38, Code 8086
> > 300 Highway 361
> > Crane, IN 47522
> > 812-854-3073
>
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