Ted,
This is a group error. You should always include the manufacturer's annular ring requirements,
and they should have checked that there was adequate clearance.
You don't want them adjusting anything automatically.
By default, all your holes should have 9 mil of annular ring (in addition to your electrical clearance)
(18 Over the hole) Less if the manufacturer specifies less.
The manufacturer should be held accountable for this though since they didn't check to see
if it was manufacturerable. This is unless they specify somewhere they build "as is."
Many cut cost but not doing initial checks, which reduces cost, but cause more errors
for designers that haven't encountered problems such as this.

Chris Robertson
Author "PCB Designer's Reference"
[log in to unmask]
ISBN: 0130674818
Search for it at www.amazon.com

  ----- Original Message -----
  From: Ted Tontis, C.I.D.
  To: [log in to unmask]
  Sent: Tuesday, December 09, 2003 10:12 AM
  Subject: [DC] Manufacture adjusting Gerber's


  We recently sent out a design that is in the Alpha stage. We received an
  e-mail back from the assembly house and they had complained that we called
  out for a hole that had a finished diameter 118 mils with a clearance
  opening of 126 mils. They are now getting shorts in the board, there
  response was "That for a finished 118 mil hole we drill a 124 mil hole so
  there is most certainly going to be a short."  I was under the understanding
  that the board manufacture knows that if he is going to need to drill a hole
  larger to meet the finished requirements they automatically increases the
  clearance to compensate for the drill hole needed. Am I wrong?

  Regards,

  Ted Tontis CID
  Engage Networks Inc.
  1320 N. Dr. Martin Luther King Drive
  River Level
  Milwaukee, WI 53212
  PH 414-918-4267
  FX 414-273-7601




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