Re: [CAD_CAM_EDM_DRO] Re: Circuit Board Layout Program

mariss92705 wrote:

> Alan,
>
> This is a gerber file of a 0.9" circle inscribed in a 0.9" square
> whose lower left-hand corner was placed at the x,y origin (x=0, y=0).
> Most of the code must be for the circle line segments. The numerical
> data is xxx.xxxx leading zeroes and decimal point not shown. Seems it
> should be possible to turn it into G-Code.
>
> Mariss
>
> G04 AutoGERB for AutoCAD 14/2000*
> G04 RS274-X Output *
> %FSLAX34Y34*% This is the format specifier (FS) line - it says
> coordinates

are absolute, x and Y are both 3.4 digits, as you say above.

>
> %MOIN*% This one is a bit odd, bit I think sets coords to inches
> %ADD12C,0.005000*%
> %ADD13C,0.007000*% These are the aperture definitions, looks loke 5 and 7
> mil circles

The rest is draws and fills.
Ignore the G54. Dnn, where nn is 10 or greater selects an aperture
described above.
So, D12 draws with a .005" line. D01 is a draw from current location to
specified coordinates.
D02 is a move without drawing. D03 is a flash aperture at that location.
Unless you are
using positive and negative drawing, which is a feature of RS-274X, that is
about all
there is to it. I have made programs that do somewhat similar things, ie.
read in
some variant of G-code and convert it to some other variant. The aperture
selection
is like a tool change. Although with an engraving point, depth can control
diameter.
Now, one limitation is that in the Gerber file, you can flash rectangular
apertures, etc.
But, the D01 is like a Z-down and then cut, the D02 is like a Z-up and move
above
the part. And a D03 is like a canned cycle, move and then Z-down and back
up.

>
> G54D12*X10000Y5000D02*X9988Y5348D01*X9952Y5694*X9891Y6036*X9807Y6374*X
> 9700Y6705*X9570Y7028*X9418Y7341*X9245Y7642*X9051Y7931*X8837Y8206*X8605
> Y8465*X8355Y8707*X8089Y8932*X7808Y9137*X7514Y9322*X7207Y9486*X6890Y962

Jon