You are absolutely correct. 2 oz cu and 004 mil lines are a nightmare
from a yield standpoint although we have produced some in our TC. 1/2
oz and 1/4 oz are better suited for lines this tight.
Jamie Morrow
______________________________ Reply Separator _________________________________
Subject: Re: [DC] Re[2]: [DC] Need suggestions
Author: George Uptain <[log in to unmask]> at SMTPLink-Hadco
Date: 3/26/98 1:36 PM
Don't forget to account for copper weight.
I doubt any fab house can produce 4/4 on
two ounce copper. For 4/4 would you not
want to go above half ounce?
George W Uptain, Jr.
Austin Product Center of Schlumberger Oilfield Services
(512)331-3183
> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Thursday, March 26, 1998 2:27 PM
> To: [log in to unmask]
> Subject: [DC] Re[2]: [DC] Need suggestions
>
> Scott,
>
> Genearally speaking, the information you provide allows the PCB
> Fabricator to make basic assumptions about Line/Width/Spacing.
> Generally speaking, Holes Per Square Inch and Smallest Hole Size
> allows us to estimate approximately what the Line/Width/Spacing
> will
> be. For example, a board with 55 holes per square inch with a
> smallest
> hole size of .012 would definately be a finer line board. A
> board
> with 15 Holes Per Square and a smallest hole size of .030 would
> not be
> a fine line board.
>
> Concerning, cost adders , 004/004 LWS and below is where we see
> the
> largest impact on cost. .012/.012 LWS - .005/.005 LWS is standard
> with
> the major PCB vendors like HADCO.
>
> HADCO would be happy to provide your company with a Design for
> Manufacturing presentation. This presentation is geared towards
> mainstreaming designs for "best cost". Topics included are panel
> utilization, artwork, lay-ups, drilling, surface finishes, gerber
> data, testing, price comparisons, and new technologies available
> in
> volume.
>
> Sincerely,
>
> Jamie Morrow
> HADCO
> (717) 948-9610
>
>
> ______________________________ Reply Separator
> _________________________________
> Subject: Re: [DC] Need suggestions
> Author: Scott Shepard <[log in to unmask]> at SMTPLink-Hadco
> Date: 3/26/98 10:08 AM
>
>
> Well, with my experience, you may want to get quotes from other pcb
> fabricators. The quotes we get do not discriminate with trace
> thickness.
> As a matter of fact, our vendors usually don't see the board, they get
> a
> look at the fab, dimensions, hole sizes, # of layers, notes regarding
> material and process. Sometimes, I get the quotes over the phone. I do
> realize however, there may be many other methods for quoting the fab
> process.
>
> IMHO
> Scott
>
> -----Original Message-----
> From: JoAnn Amerson [SMTP:[log in to unmask]]
> Sent: Thursday, March 26, 1998 8:12 AM
> To: ScottS; DesignerCouncil
> Subject: [DC] Need suggestions
>
>
> My boss and I were talking yesterday about what our board fabricators
> can and cannot do. We're being asked to use 12mil traces as a
> minimum because anything smaller is an increase in price. I assumed
> 8mil was the "standard", unless otherwise called for due to current
> load, board size, etc. What are you, in the real world, using for
> your "plain Jane" signal traces? And also, he keeps telling me we
> use a foreign board fabricator for the boards that use soft gold.
> Something about it uses arsenic in the process and domestic vendors
> don't want the hassle or expense. I know that Hadco does soft gold
> and I think it's done in New York. Does anyone have any info on
> other companies located in the US who can do soft gold?
>
> JoAnn L. Amerson
> Design Librarian
> Red Lion Controls, Inc.
> E-mail: [log in to unmask]
> Voice: (717) 767-6961 ext 6308
>
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