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From: "miloh (miloh AT froggytoad DOT net) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] [pcb-rnd] tEDAx footprint load support
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Precedence: bulk

Why not set plating to '0' for a unplated hole that is treated as a
mounting hole?

By the way, mounting holes are really different across fabrication
industry and the current discussion of 'do unplated holes' exist
doesn't really capture that. Why is that? I'm sure without as much
experience as others in the thread that I've seen insulated,
conducting, unplated, masked, unmasked, dot unmasked styles for
mounting holes all in a wide swath of electronics manufacture (no
aerospace though). A variety of purposes and conditions for use in
differing designs.

As for clearance, these values affect long term stability and
usability.  otoh, part packing in design, and repair/reworkability
down the road.

Blind and buried vias are an interesteing topic, but to me not
relevant to footprint support - what do others think?


-r miloh alexander

On Tue, Mar 14, 2017 at 1:09 PM, Chad Parker
(parker DOT charles AT gmail DOT com) [via geda-user AT delorie DOT com]
<geda-user AT delorie DOT com> wrote:
> It's because if you accidentally put too much torque on the screw, it can
> crack the plating and cause failures. This could result in debris that could
> short something intermittently, or could potentially cause the connection to
> fail on one of the other copper layers.
>
> It only has to happen to you once on a really expensive project...!
>
> On Tue, Mar 14, 2017 at 3:55 PM, Girvin Herr (gherrl AT fastmail DOT com) [via
> geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>>
>>
>>
>> On 03/14/2017 12:31 PM, Chad Parker (parker DOT charles AT gmail DOT com) [via
>> geda-user AT delorie DOT com] wrote:
>>>>
>>>>  - Holes without plating is common.
>>>
>>>
>>> Common, but not essential. The same footprint could work fine with plated
>>> holes.
>>
>>
>> Not always. In much of my work I'm not allowed to use pth for any kind of
>> mounting hole, which would include holes for screwing into things like heat
>> sinks and packages that might be included in a footprint.
>>
>>
>> --Chad
>>
>> +1
>> I was in the aerospace industry for years and I agree.  Mounting holes
>> shall not be plated.  I no longer remember why.  Probably due to a failure
>> or two traced to the pth mounting holes - A reliability issue.  Ignoring
>> history and thinking outside the box is not always a good thing to do.
>>
>> Girvin Herr
>>
>