Ty Thomas wrote:
> 
> Hello Siggers,
> 
> Here's the scenario:
> 
> Board warpage has become an issue in our shop so we are adding fill to
> open areas on the boards. Our fab houses like a round or square feature
> of varying density. Mentor (version A3F) only has solid or hatch as
> options. We have been using the hatch but it may not be optimum. CAM is
> probally not an option because we must have 100% repeatability between
> revisions, (Compliance approvals etc..) this is also why we can't let
> the Fab house do it for us. Oh yeah - We'd like to keep this automated.
> 
> Here's the Q's:
> 
> Fab Folks - What would you consider to be an adequate hatch pattern?
> .025 width on .05 grid? (If hatch is our only option) What would you
> recommend for a spot pattern?
> 
> Designers - Are there any other Mentor users adding fill areas and how
> do you handle it?
> 
> Thanks in advance for any comments or suggestions.
> 
> Ty Thomas
> Sr Product Packaging Designer
> Paradyne Corp.
> Largo FL
> [log in to unmask]
> 813-530-8434
> 
>

Dear Ty:

As a board fabricator, we typically add a spot pattern consisting of
.050" square pads on a .100" grid to fill in open area on the board.
Most CAM software can add a pattern like this fairly easily, although
it wouldn't be possible to guarantee 100% repeatability between Revs.

If hatch is your only option, the pattern you suggested,
(.025" width / .050" grid) should cause no fabrication problems.

John Lennox
Eastern Manufacturing Corporation

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