kicad-developers team mailing list archive

[Jean-Paul Louis <louijp@xxxxxxxxx>]

Wayne,

Except in very hugh frequency design (higher UHF spectrum, microwaves and millimeter waves)
were chamfers can create more problems than they solve.

This chamfer should be user optional, the best being individual part layout optional.

Just my extra data point,

Jean-Paul
N1JPL


> On Jun 21, 2019, at 8:05 AM, Wayne Stambaugh <stambaughw@xxxxxxxxx> wrote:
> 
> Jeff,
> 
> Users are going to expect chamfering if there is an option for it.  I
> don't see how you are going to avoid adding chamfering to the spokes
> unless we decide to do away with chamfering as an option.  I don't think
> that's good idea because right angles on board geometry is generally
> frowned upon.
> 
> Wayne
> 
> On 6/20/19 4:24 PM, Jeff Young wrote:
>> Turns out there’s a slightly unintended side effect.
>> 
>> Before:
>> 
>> Note the two truncated thermal spokes to the surface-mount pads at the
>> lower right.
>> 
>> After:
>> 
>> 
>> 
>> 
>> The bug is fixed, but not that the junctions between the spokes and the
>> zone body are no longer chamfered.
>> 
>> I’d say the “after” is better in that respect too, but again it’s
>> definitely different.
>> 
>> Thoughts?
>> 
>> Cheers,
>> Jeff.
>> 
>> 
>>> On 20 Jun 2019, at 19:50, Reece Pollack <reece@xxxxxxx
>>> <mailto:reece@xxxxxxx>> wrote:
>>> 
>>> Memory is the second thing to go as one ages.
>>> 
>>> I can't remember what the first one is.
>>> 
>>> ------------------------------------------------------------------------
>>> *From: *"Jeff Young" <jeff@xxxxxxxxx <mailto:jeff@xxxxxxxxx>>
>>> *To: *"jp charras" <jp.charras@xxxxxxxxxx <mailto:jp.charras@xxxxxxxxxx>>
>>> *Cc: *"KiCad Developers" <kicad-developers@xxxxxxxxxxxxxxxxxxx
>>> <mailto:kicad-developers@xxxxxxxxxxxxxxxxxxx>>
>>> *Sent: *Thursday, June 20, 2019 2:46:58 PM
>>> *Subject: *Re: [Kicad-developers] 6.0 Zone filling differences
>>> 
>>> Wow.  That’s sobering.  I wrote the board outline clearance changes….
>>> 
>>> Age sucks.
>>> 
>>> 
>>>    On 20 Jun 2019, at 19:04, jp charras <jp.charras@xxxxxxxxxx
>>>    <mailto:jp.charras@xxxxxxxxxx>> wrote:
>>> 
>>>    Le 20/06/2019 à 19:24, Jeff Young a écrit :
>>> 
>>>        I believe we now have a warning, but I can’t remember what
>>>        change it was for.  I thought it was for the outline changes,
>>>        but from what I can find on the mailing list archive it looks
>>>        like we were satisfied that one wouldn’t change anything.
>>> 
>>>        So remind me what the warning is for?
>>> 
>>> 
>>>    AFAIK, it is for board outline clearance change (taking in accounf or
>>>    not the edge cut graphic items thickness, if I correctly remember).
>>>    Zone outline changes (only activated if the kicad_advanced
>>>    "ForceThickZones=0" option enables it), do not need any warning.
>>> 
>>> 
>>>        The reason behind this request is that I have a new fill
>>>        algorithm which fixes a long-standing bug regarding one pad’s
>>>        thermal ring knocking out another pad’s thermal spoke.  It
>>>        also allows thermal spokes on custom pad shapes (and would
>>>        allow us to support custom number of spokes if we wished).
>>> 
>>>        While this should only change zone fills which would have been
>>>        considered errors in the past, it nevertheless changes them.
>>>         What’s the prescription for that?
>>> 
>>>        Cheers,
>>>        Jeff.
>>> 
>>> 
>>> 
>>> 
>>>    -- 
>>>    Jean-Pierre CHARRAS
>>> 
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>>> 
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>> 
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