Eagle CAM foo

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We used to reduce it 2:1, I imagine some fine stuff would have been
done 4:1.

The last time I used tape was in college and that was used on a
lathe-type PCB machine. After college, everything was done in a CAD
system (though schematics were drawn and netlists entered by hand for
a few years). The boards were done by a positive system, too, so
multi-layer and traces could be quite fine (three traces between .100"
spaced IC pads were common).

Made it difficult to check the footprints.

Make 2:1 or 4:1 models of each footprint?

 

[josephkk]

I have done further investigation on this mess.
Matters not what layer one uses (1, 2, 121, 200etc).
Drawing a WIRE, it gets transferred by CAM down to 0.05mil (what
Eagle calls zero).

That really means "pen" size zero (the smallest in the system).

BUT....drawing a RECT, if the width or the length (ie one of its
dimensions) is less than 1.0mil, it gets dropped.
So, the Cam processor is flawed.
Is there a fix?

There still seems to be a units inconsistency involved.

?-)

 

[Robert Baer]

Wow, getting the tape which was usually 3 mils thick minimum to stand up
cleanly at 2 mils width is impressive. Or is there some confusion in the
units?

?-)

Who said anything about tape (for fine lines)?
A good drafting pen will give lines far finer than those rolls of tape.
And for finer lines, look at the bills in your pocket, which were
counterfeited by (crudely speaking) scratches back in those daze.
I will not instruct anyone how to counterfeit paper currency, even
the older-printed version (read: silver certificate age).
Some of the techniques to do so were useful to make fine lines for
PCBs, which was all i cared about.

 

[Robert Baer]

We used to reduce it 2:1, I imagine some fine stuff would have been
done 4:1.

Made it difficult to check the footprints.


Best regards,
Spehro Pefhany

Photo reduction is a very excellent tool.
Have even used a photo technique to make negatives of both sides of PCBs.
Remember the Altair computer?
I made negs of the PCBs, patched where needed, then positives for
added corrections and revisions including removing the mess of jumpers.
Resulting improved PCB was made and sold in the hundreds near cost.
Altair owner sent me a letter saying those copies (which were NOT the
same due to circuit improvements at minimum) were "copyrighted" and
virtually blackmailed me to stop.
I also made copies of the BASIC tapes and included inverse assembly
language listings, which he said were "patented"; he virtually
blackmailed me to stop that as well.
Nothing had been copyrighted and the boards i made were out of the
bounds of any purported copyright (new and different circuitry).
Software could NOT be patented in those daze.
Also, the inverse assembly listing was never created by him either
directly or indirectly; he had ZERO ownership.

 

[josephkk]

Who said anything about tape (for fine lines)?
A good drafting pen will give lines far finer than those rolls of tape.
And for finer lines, look at the bills in your pocket, which were
counterfeited by (crudely speaking) scratches back in those daze.
I will not instruct anyone how to counterfeit paper currency, even
the older-printed version (read: silver certificate age).
Some of the techniques to do so were useful to make fine lines for
PCBs, which was all i cared about.

That is a whole different pan of sknarr then.

?-)