Mike,
        What is the "primary mask clearance at the location to be
postplugged" requirements?  I would like to pass this information on to our
DFM guys.

Thanks
Ryan Grant

> -----Original Message-----
> From: Mike Bailey [SMTP:[log in to unmask]]
> Sent: Friday, March 31, 2000 7:53 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] via plugging
>
> I haven't seen any industry guidelines, however, occasionally a customer
> who
> has been "burned" will specify .002 max.  This is achievable with straight
> masking operations.  If performing separate "postplugging" operations
> after
> primary mask application and surface finishing etc., it's important to
> insure that the primary mask has a clearance at the location that is to be
> postplugged.  Otherwise if the hole is partially plugged etc., the
> secondary
> masking operation will leave a very undesirable bump approx. .005-.006
> high.
> These specialized operations drive inspectors and CAM operators absolutely
> crazy. Additionally, most customers are neither consistent with their data
> or assembly needs.  Typically, the masking information is the least
> considered by a designer.  Couple this with third party contract
> assemblers
> and you have numerous opportunities for error.
>
> Mike Bailey
> Director of Engineering
> McCurdy Circuits Inc.
> 4900 E. Hunter Ave.
> Anaheim, CA  92870
> Phone: 714 507-4900 Ext 253
> FAX: 714 507-4911
> e-mail: [log in to unmask] <mailto:[log in to unmask]>
>
> -----Original Message-----
> From: Rick Babyak [mailto:[log in to unmask]]
> Sent: Friday, March 31, 2000 4:47 AM
> To: [log in to unmask]
> Subject: [TN] via plugging
>
>
> Is there any acceptance criteria or a spec out there that covers via
> plugging with mask/ink?
>
>
>
> Rick Babyak
> Process Engineer
> Proto Circuit Inc.
> 7 Ascot Parkway
> Cuyahoga Falls, OH 44223
> 330-572-3401  Fax:330-572-3434
> [log in to unmask]
>
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