photo plotter apertures for traces
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Posted by sycochkn on January 23, 2008, 8:21 pm
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Posted by James Beck on January 24, 2008, 9:32 am
Please log in for more thread options Since my CAD package pretty much handles the code generation for FLASH and DRAW I couldn't say for sure without looking in the output file, BUT I doubt it. I do know that CADStar can optimize route T's and other junctures so there isn't an overshoot bulge on the far side. Kinda' does a little pull back on the gerber data. Jim | |||||||||||||
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Posted by Hal Murray on January 25, 2008, 12:51 am
Please log in for more thread options >Since my CAD package pretty much handles the code generation for FLASH
>and DRAW I couldn't say for sure without looking in the output file, BUT >I doubt it. I do know that CADStar can optimize route T's and other >junctures so there isn't an overshoot bulge on the far side. Kinda' >does a little pull back on the gerber data. Where does that "overshoot bulge" come from? If I draw a T with 3 lines using the same dia round pen, it comes out clean. I'm drawing the lines so they all meet at the same point which is the middle of each line. The circle from the left matches the circle from the right. At the junction, there is a circle that gets painted twice. If I bring the bottom line up to the exact same point, it doesn't overshoot at all. The circle at the end point overpaints the same circle that was already painted twice. The new line adds a pair of small sections to the area that gets painted twice. They are the corners from the circle SW and SE to the edges of the lines. -- These are my opinions, not necessarily my employer's. I hate spam. | |||||||||||||
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Posted by James Beck on January 28, 2008, 11:09 am
Please log in for more thread options usenet@ip-64-139-1-69.sjc.megapath.net says...
> >Since my CAD package pretty much handles the code generation for FLASH
> >and DRAW I couldn't say for sure without looking in the output file, BUT > >I doubt it. I do know that CADStar can optimize route T's and other > >junctures so there isn't an overshoot bulge on the far side. Kinda' > >does a little pull back on the gerber data. >
If all the routes are of the same diameter then yes, no bulge, but not
> Where does that "overshoot bulge" come from? > > If I draw a T with 3 lines using the same dia round pen, > it comes out clean. I'm drawing the lines so they all meet > at the same point which is the middle of each line. > > The circle from the left matches the circle from the right. > At the junction, there is a circle that gets painted twice. > > If I bring the bottom line up to the exact same point, it > doesn't overshoot at all. The circle at the end point overpaints > the same circle that was already painted twice. The new line > adds a pair of small sections to the area that gets painted > twice. They are the corners from the circle SW and SE to the > edges of the lines. > > all intersections are from the same DRAW code. You, obviously, don't need to optimize out a bulge that isn't there. You can also get a bulge when a DRAW and a FLASH overlap/end on each other. Big DRAW aperture onto a smaller rectangular FLASH and you get a little overshoot. Jim | |||||||||||||
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Posted by sycochkn on January 28, 2008, 7:56 pm
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> usenet@ip-64-139-1-69.sjc.megapath.net says...
>> >Since my CAD package pretty much handles the code generation for FLASH
>> >and DRAW I couldn't say for sure without looking in the output file, BUT >> >I doubt it. I do know that CADStar can optimize route T's and other >> >junctures so there isn't an overshoot bulge on the far side. Kinda' >> >does a little pull back on the gerber data. >>
>> Where does that "overshoot bulge" come from? >> >> If I draw a T with 3 lines using the same dia round pen, >> it comes out clean. I'm drawing the lines so they all meet >> at the same point which is the middle of each line. >> >> The circle from the left matches the circle from the right. >> At the junction, there is a circle that gets painted twice. >> >> If I bring the bottom line up to the exact same point, it >> doesn't overshoot at all. The circle at the end point overpaints >> the same circle that was already painted twice. The new line >> adds a pair of small sections to the area that gets painted >> twice. They are the corners from the circle SW and SE to the >> edges of the lines. >> >> > If all the routes are of the same diameter then yes, no bulge, but not
> all intersections are from the same DRAW code. You, obviously, don't > need to optimize out a bulge that isn't there. You can also get a bulge > when a DRAW and a FLASH overlap/end on each other. Big DRAW aperture > onto a smaller rectangular FLASH and you get a little overshoot. > > Jim | |||||||||||||
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> Bob
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