Good job Leo,
I will have to drag out a couple of designs and check their Gerber
settings. Maybe play with them a little to see if I can cause the problem again
and then eliminate it as well with your fix. Just to confirm absolutely that
this is the solution to when I saw these issues as well.
However I do know from my experience that tweaking pour outlines also
fixes it, since all of the occasions where I saw it were along pour outlines.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
#14 - 1925 Kirschner Road,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2329 ext. 225
fax (250) 762-3374
-----Original Message-----
From: Leo Potjewijd [mailto:[EMAIL PROTECTED]
Sent: Tuesday, September 27, 2005 5:51 AM
To: Protel EDA Discussion List
Subject: Re: [PEDA] arcs in Gerber go the wrong way
At 19-9-2005 14:31, Leo Potjewijd wrote:
>On the PCB (P99SE) all my arcs look great, even on the print preview.
>But in the Gerber files some, not all, are wrong: the start and end in the
>right places, but go the wrong way around. So a 90 degree turn ends up as
>a 270 degree turn with another center and shorts stuff......
And I am pleased to tell you all what the cause of this was. (drum roll,
please ;)
In the 'Advanced' tab of the Gerber Setup screen (right-click on gerber
outputs in CAM Manager) is a radio button 'Plotter Type'. As soon as this
is set to 'Sorted (vector)' the trouble starts: random inversions of arcs
and even deformation of texts.....
There must be an indicator to identify the arcs that go wrong from other
elements, but that has not been found.
Probably something like 'sweep angle divided by trace width, multiplied by
the quotient of X and Y location relative to the nearest via, plus the
clearance of the next two items in the PCB divided by the layer; when the
third digit in the answer is even the arc is OK, otherwise the direction
will change'. Or maybe just the electronic equivalent of flipping a coin,
who is to tell.....
I set that radio button back to 'Unsorted (raster)' and the output was as I
expected it to be the first time.
Leo Potjewijd
hardware designer
Integrated Engineering B.V.
[EMAIL PROTECTED]
+31 20 4620700
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