Clear circular space in bottom layer?

"Fredric" wrote

Great forum this, quick and good answers, been scratching my head with

this

one as well.

 

I have a small project, about 10x10xm bottom layer, smaller rectangle on

the top layer.

 

Trick here is that there's supposed to be a hole near the middle, the top

layer is supposed to have copper to the edge of the hole so that's solved.

My problem is that on the bottom layer I need to have a copper free area

of

1mm around the 2mm hole (1mm radius hole, 2mm radius free space)

 

I have tried bRestrict and bKeepout, didn't help, I guess these are

perhaps

just to keep away components from that area?

 

I had some result using a polygon, but the copper around the hole was not

circular around the edge (not when viewing Gerber either) and polygons are

enormous in size, 1.5MB instead of 1kB file...

 

I've also thought about using "Holes" but there's no restriction you can

set to the layer. I basically just need to do the same as the bStop layer

but for the bottom layer instead.

When you use polygons, set the wire size to as large as you can and still

retain the detail you want. Try 10mil for a start. Large file sizes arise

from using zero width.

It's unclear what kind of copper you have on the bottom of your board.

(.....> I had some result using a polygon, but the copper around the hole

was not

circular around the edge...)

Post an image of your board.

I just want a solid layer, a hole near the middle, 1mm clear space around

the hole on the bottom layer. So a 3mm empty space in the form of a circle,

I was hoping to be able to use the rectangle for this and just clear that

space somehow... When making the regtangle as a polygon I have tried

various method of making the clearance in the bottom layer but the polygon

part doesn't get completely round but jagged.

I can try adding width to it though.

It's the center hole that needs the bottom layer cleared around it.

This is not the actual design, the measurements differ, I just wanted to

try and sort it out at home.

Seeing the editor of the gerber files today simply taking the rectangle and

a filled circle, setting the circle as negative and adding them together

makes all this a quite painful process. It's so simple but not in Eagle...

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`

end

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 1/24/2011 2:10 PM, Fredric wrote:

I just want a solid layer, a hole near the middle, 1mm clear space around

the hole on the bottom layer. So a 3mm empty space in the form of a circle,

I was hoping to be able to use the rectangle for this and just clear that

space somehow... When making the regtangle as a polygon I have tried

various method of making the clearance in the bottom layer but the polygon

part doesn't get completely round but jagged.

 

I can try adding width to it though.

 

>

 

It's the center hole that needs the bottom layer cleared around it.

 

This is not the actual design, the measurements differ, I just wanted to

try and sort it out at home.

 

>

Seeing the editor of the gerber files today simply taking the rectangle and

a filled circle, setting the circle as negative and adding them together

makes all this a quite painful process. It's so simple but not in

Eagle... begin 644 Image1.png

MB5!.1PT&@H````-24A$4@```XH```J"`(```#S-#<M````*W1%6'1#<F5A

You need to use the circle command to draw the bStop. It works best to

do it from the command line, see "help circle" for the somewhat weird

syntax. Use the HOLE command to make the proper size hole. I assume you

got this far. The polygon surrounding the hole will avoid it by an

amount set in the DRC. If there is nothing on your board but this hole,

you could just change the clearance parameter ( You can figure out which

one, between dimension and signal probably).

Otherwise you draw a filled circle in the bStop layer. How do you do

that? choose circle command, it will ask for the center of the circle,

use the center of the hole, now go up to the parameter bar and set the

circles width ( yes width) to zero! This makes the circle filled. That's

right a width of zero is full width. How did you not intuitively know

this? Okay, it will now ask you to click on the outer diameter of

the circle. Done.

the real pro way to do this is to set the MARK and issue the commands

HOLE x (R0 0) then CIR 0 (R0 0) (R0 y)   where x and y are drill

diameter and stop radius. You can also use CHANGE to post-humously set

the diameter to zero, hence fill the circle.

Good Luck

On 1/24/2011 2:10 PM, Fredric wrote:

I just want a solid layer, a hole near the middle, 1mm clear space around

the hole on the bottom layer. So a 3mm empty space in the form of a circle,

I was hoping to be able to use the rectangle for this and just clear that

space somehow... When making the regtangle as a polygon I have tried

various method of making the clearance in the bottom layer but the polygon

part doesn't get completely round but jagged.

 

I can try adding width to it though.

 

>

 

It's the center hole that needs the bottom layer cleared around it.

 

This is not the actual design, the measurements differ, I just wanted to

try and sort it out at home.

 

>

Seeing the editor of the gerber files today simply taking the rectangle and

a filled circle, setting the circle as negative and adding them together

makes all this a quite painful process. It's so simple but not in

Eagle... begin 644 Image1.png

MB5!.1PT&@H````-24A$4@```XH```J"`(```#S-#<M````*W1%6'1#<F5A

You need to use the circle command to draw the bStop. It works best to

do it from the command line, see "help circle" for the somewhat weird

syntax. Use the HOLE command to make the proper size hole. I assume you

got this far. The polygon surrounding the hole will avoid it by an

amount set in the DRC. If there is nothing on your board but this hole,

you could just change the clearance parameter ( You can figure out which

one, between dimension and signal probably).

Otherwise you draw a filled circle in the bStop layer. How do you do

that? choose circle command, it will ask for the center of the circle,

use the center of the hole, now go up to the parameter bar and set the

circles width ( yes width) to zero! This makes the circle filled. That's

right a width of zero is full width. How did you not intuitively know

this? Okay, it will now ask you to click on the outer diameter of

the circle. Done.

the real pro way to do this is to set the MARK and issue the commands

HOLE x (R0 0) then CIR 0 (R0 0) (R0 y)   where x and y are drill

diameter and stop radius. You can also use CHANGE to post-humously set

the diameter to zero, hence fill the circle.

Good Luck