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

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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

"Fredric" <e5frog@gmail.com> wrote in message

news:ihktdf$2c1$1@cheetah.cadsoft.de...

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.

Hmmm ! This is what I thought you meant but your words "'...but the polygon

part doesn't get completely round but jagged....." confused me.

Anyway this is easy, because your requirements are simple. It may not be the

case when your board is more complex.

On the TOP place a rectangle

Place a HOLE of the desired size in the middle

On the bottom place a polygon of the desired size. Lets make it the exact

size of the board dimensions.

Next, there is a DRC setting (DRC/Distance/Copper-Dimension) that will keep

the polygon pour the specified distance away from dimension objects. The

objects in this case are your outer board shape and the periphery of the

hole

If you make that DRC setting 40mils you will have your 1mm clearance around

the hole. Also the polygon will be pulled back 40mils from the edge of the

board, which is normal practice.

If the 'jagged' you refer to is the circle  being made up if straight

sections, set the wire width the polygon is drawn with to something that

works for you. I got a good result with  50mil wires. Check that the corners

of the polygon remain acceptable.

Warren

bStop part is solved, I just wasn't thinking properly.

If I use a polygon for the bottom layer and set the distance of 40mil we're

in the ballpark but the hole in the bottom layer is then 16 cornered

instead of round. So I placed an enough thick circle there and changed the

clearance to 0 to make the polygon and circle blend together.

Solved the problem, but the four corners are rounded because the polygon

line is rounded off, tried adding rectangles but the I got quarter rounds

at the two edges of that rectangle instead so I decided to have round

corners, rounding can be shrunk by thinning the polygon line I guess but it

was apparantly not that important.

So thanks guys, managed to get that PCB done and making the others will be

a little easier.

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