Re: photo plotter apertures for traces

Geo wrote:
On Fri, 25 Jan 2008 15:29:20 -0800, "sycochkn" <sycochkn@xxxxxxxxxxxxx> wrote:


Actually there are 5 types of apertures circular, rectangular, oblong, diamond and drawn.
all except the drawn can be used for traces. only the round one will give you the same width in all directions and gurantee no overshoot from the traces.

Cadstar specifies an annular ring to draw traces. Apparently the idea was to
prevent overexposure by the overlap of a solid circle.

PCB film exposure is an all or nothing process. It is either fully exposed to
light, or not exposed at all. There is no chemical difference in the emulsion
between fully exposed, and fully-fully-fully exposed. The only way to overexpose
PCB photographic film is to burn a hole in it, which isn't going to happen.

-Chuck
.

Relevant Pages

  • Re: photo plotter apertures for traces
    ... all except the drawn can be used for traces. ... you the same width in all directions and gurantee no overshoot from the ...
    (sci.electronics.cad)
  • Re: photo plotter apertures for traces
    ... all except the drawn can be used for traces. ... you the same width in all directions and gurantee no overshoot from the ... Cadstar specifies an annular ring to draw traces. ...
    (sci.electronics.cad)