Circular PCB with circular notches

The idea would be to group an arc plus two short straight segments together

and rotate the entire object by maybe a degree or so.  I then want to copy

and paste five of these objects around the circumference.

Thanks,

Don

"Don Golding" <dgolding@sbcglobal.net> wrote in message

news:i5bot3$4m1$1@cheetah.cadsoft.de...

what is the best way to micro-rotate the circular notches around the

circumference of the pcb?

>

Thanks,

Don

 

Don Golding wrote:

>The idea would be to group an arc plus two short straight segments together

>and rotate the entire object by maybe a degree or so.  I then want to copy

>and paste five of these objects around the circumference.

That's the easy part 8-)

just draw your arc + attached segments and group them.

Then enter  'rot r72' on the command line, press

assuming that the center of rotation (center of board) is the point of

origin.

repeat 4 times, done

but as said before, that is the easy part. As eagle will not calculate

line intersections, or does no snap-to-end-off-line when drawing,

there is no easy way to get a closed outline when adding the arcs for

the board outline.

So either construct the board outline in a CAD program and import them

via dfx (see appropriate ULP), or draw one notch and one attached

outline arc using precalculated coordinates, then complete the outline

per copying as described above.

And see the help text for the wire command (especially the radius and

curve options) and the chapter 'command syntax' (about coordinate

modifiers).

--

Lorenz

Don Golding wrote:

>The idea would be to group an arc plus two short straight segments together

>and rotate the entire object by maybe a degree or so.  I then want to copy

>and paste five of these objects around the circumference.

That's the easy part 8-)

just draw your arc + attached segments and group them.

Then enter  'rot r72' on the command line, press

assuming that the center of rotation (center of board) is the point of

origin.

repeat 4 times, done

but as said before, that is the easy part. As eagle will not calculate

line intersections, or does no snap-to-end-off-line when drawing,

there is no easy way to get a closed outline when adding the arcs for

the board outline.

So either construct the board outline in a CAD program and import them

via dfx (see appropriate ULP), or draw one notch and one attached

outline arc using precalculated coordinates, then complete the outline

per copying as described above.

And see the help text for the wire command (especially the radius and

curve options) and the chapter 'command syntax' (about coordinate

modifiers).

--

Lorenz

"Lorenz"  wrote

>

>............... but as said before, that is the easy part. As eagle will

not calculate

line intersections, or does no snap-to-end-off-line when drawing,

there is no easy way to get a closed outline when adding the arcs for

the board outline................................

>

True, you cannot snap to the end of a line that is not on a grid but you can

get two line ends to snap to the same grid point. Which has the desired

effect.

So if you manually get the ends very close you can subsequently snap them to

the same grid point.

There is an element of error that can be introduced but it's up to you to

make the error acceptable by selecting a grid that is fine enough. In my

example the error was <0.5mil but I could have made it much less.

Make the grid or alt grid very small (not to small) and with Move command

activated (and zoomed all the way in) hold the CTL so the line end snaps to

the grid. Do the arc end first as the short straight short lines of the

notch are already accurately placed. When you have the end placed as close

as your chosen grid permits. Drop it and then snap the end of the straight

line to the same point. Verify the coords for both lines are the same with

INFO.

Warren