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Subject:	Re: supported vs unsupported
From:	Jeffrey Bush <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Jeffrey Bush <[log in to unmask]>
Date:	Wed, 28 Dec 2005 14:29:30 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (126 lines)

So, if I have a hole that is non-plated, but has a pad, it is supported,
rather than non-supported and the .002" annular ring requirement (Class
3) applies?  Then an unsupported hole, which has no plating and no pad
has an annular ring requirement (Class 3) of .005"?  Where will the
annular ring come from? 

The support is the plating in the barrel. 

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 37 
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of mattyk
Sent: Wednesday, December 28, 2005 2:25 PM
To: [log in to unmask]
Subject: Re: [TN] supported vs unsupported

A non-plated hole can be a supported hole.

i.e. a non-plated hole with pads or a copper ring around the hole.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Wednesday, December 28, 2005 2:16 PM
To: [log in to unmask]
Subject: Re: [TN] supported vs unsupported

The support is the barrel.  Plated holes are supported and non-plated
holes are unsupported.

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
           76 Technology Drive - POB 1890
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 37
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/>

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Babcock John
Sent: Wednesday, December 28, 2005 1:09 PM
To: [log in to unmask]
Subject: [TN] supported vs unsupported

In IPC-A-600 it talks about minimums for external annular rings...but I
cannot find a definition for supported or unsupported holes.
What is the difference?  Does supported have a trace attached?

John

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