At 01:02 PM 9/3/2008, you wrote:
Notice that they specify 0 degrees as pin one in the SW
quadrant. Although they don't say which direction the rotation is,
looking at an illustration, it seems to show that the rotation is
CCW. I want to say I read this somewhere else, but I can't say
where. It is not easy to find this info on the web.
I did some more searching and found another document on XYRS
formats. I should have stopped at one, because now I have two that conflict...
This one can be found at
http://www.screamingcircuits.com/Portals/0/documents/Understanding%20the%20Centroid%20file.pdf
They are very clear that the rotation is CCW. They make it a bit
fuzzy for the bottom side by talking about it as viewed from the top
side. But from the perspective of the assembly machine, it is CCW on
both sides when viewed from that side.
However,,, they use a 0 degree orientation having pin one in the
upper left quadrant.
I have tried to find this info at the machine maker's sites, but they
are very shy on giving technical info.
Rick
Arius - A Signal Processing Solutions Company
Specializing in DSP and FPGA design URL http://www.arius.com
4 King Ave 301-682-7772 Voice
Frederick, MD 21701-3110
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