good info
'sorted' was for way back when when they turned a physical wheel with
the D code aperture in it
it made the drawing of the strokes more effectient
Dennis Saputelli
_______________________________________________________________________
Integrated Controls, Inc. Tel: 415-647-0480 EXT 107
2851 21st Street Fax: 415-647-3003
San Francisco, CA 94110 www.integratedcontrolsinc.com
Leo Potjewijd wrote:
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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