[orcad] Re: Clearance on NPT holes

  • From: Clyde Sprowl <orcadlist@xxxxxxxxx>
  • To: orcad@xxxxxxxxxxxxx
  • Date: Tue, 5 Oct 2004 09:28:48 -0700 (PDT)

I always specify a big fat pad on internal plane layers, but I don't want pads 
on outers or inner circuit layers. I keep my drill layer turned on so I can see 
where I'm routing. If you don't place a pad in internal plane layers, you will 
surely get a plane flooded over it. Thas is as it should be, in my opinion.
"Miswald, Ron" <RMiswald@xxxxxxxxxxxxxxxxx> wrote:Hi Clyde

Your answer is what I had expected. 

Does Orcad still have that "feature" where on internal holes it floods over
when the pad is set to undefined? Is your comment about countermanding a
designers wishes how it was fixed? 

I guess there is no way besides manual to verify clearance on an NPT hole.


-----Original Message-----
From: Clyde Sprowl [mailto:orcadlist@xxxxxxxxx]
Sent: Monday, October 04, 2004 2:38 PM
To: orcad@xxxxxxxxxxxxx
Subject: [orcad] Re: Clearance on NPT holes

I bet you that you have a non-plated hole there. For some reason, Orcad
programmers changed the program so that when you create a non-plated hole
with no pads, when you close the padstack spreadsheet, it adds pads to the
front, rear and internal layers the same size as the hole diameter. In my
opinion, the designer should never have his intentions countermanded by a
computer program - especially when the program does not notify the designer
what it did. Go back and look at you non-plated hole - I bet it has pads
front and rear.
"Miswald, Ron" wrote:I have a design where the
hole to feature clearance is set to 12 mils. The
pad to trace clearance is set to 5. I have a 30 mil npt hole. Orcad 10.0
is ignoring the hole to feature (12 mil), and is using the pad to trace
clearance (5 mil). In the padstack spreadsheet I tried changing the pad
size smaller the 30. It would not accept a value less then 30. 

Currently I am manually looking for them. Is there a way to set-up so that
this is automatically found during DRC check?

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