2 cam job , same board, different result dimmension

On 4/15/2011 1:22 AM, binooetomo wrote:

Dear All ...

 

First, this post is related to my previous post here (/message/30230) (http://www.element14.com/community/message/30230 (http://www.element14.com/community/message/30230#30230))

 

I try to make 2 ps file via cam job

 

1. First cam job :

a. Layers :

- Center drill (created using drill-aid.ulp)

- Dimmension

b. device : ps

c. style  :  Pos.Coord

 

2. second cam job :

a. Layers :

- bottom

- pads

- vias

- Dimmension

b. device : PS-Inverted

c. style  :  Mirror , Pos.Coord

 

Since "Dimmension" included in both job , I'm expecting exact same dimmension of both ps file

 

I make a check for this , by importing both file to same file using Inkscape

The result is different, the first cam job produce slightly smaller dimmension

Differences betwen both is about :

- Horizontal (w) = 0.769 mm

- Vertical (h) = 0.901 mm

 

A. Picture 1 : Take a look at the dimmension of the 1rst cam job result

  Image:http://i55.tinypic.com/b7dw94.png

( http://i55.tinypic.com/b7dw94.png )

B. Picture 2 : Take a look at the dimmension of the 2nd cam job result

  Image:http://i51.tinypic.com/11gimig.png

  ( http://i51.tinypic.com/11gimig.png )

 

My Question : Is there a way to fix this ?

 

Sincerely

-bino-

 

what is the width of the dimension line you have drawn on layer 20?

perhaps the precision of the two drivers ps and ps-inverted is set

differently? a good test of whether this has to do with the drivers

would be to run identical jobs on ps and ps inverted and compare the

dimensions, that would help narrow down where the error is.

I realy appreciate your enlightment.

Guest wrote:

 

what is the width of the dimension line you have drawn on layer 20?

perhaps the precision of the two drivers ps and ps-inverted is set

differently? a good test of whether this has to do with the drivers

would be to run identical jobs on ps and ps inverted and compare the

dimensions, that would help narrow down where the error is.

 

I make a test with same job and style .. but diferent driver .

The result is (in mm) :
1. PS : 156.786 x 93.688
2. PS-INVERTED : 157.312 x 94.208

3. diference between both device : 0.526 x 0.52

Note : The dimension line width is set to 0

So, I think there is precision diferencies betwen both device.
How to tune it up ?

Sincerely
-bino-

On 4/15/2011 6:03 PM, binooetomo wrote:

I realy appreciate your enlightment.

Guest wrote:

>

>

> what is the width of the dimension line you have drawn on layer 20?

> perhaps the precision of the two drivers ps and ps-inverted is set

> differently? a good test of whether this has to do with the drivers

> would be to run identical jobs on ps and ps inverted and compare the

> dimensions, that would help narrow down where the error is.

>

 

I make a test with same job and style .. but diferent driver .

The result is (in mm) :

1. PS : 156.786 x 93.688

2. PS-INVERTED : 157.312 x 94.208

 

3. diference between both device : 0.526 x 0.52

 

Note : The dimension line width is set to 0

 

So, I think there is precision diferencies betwen both device.

How to tune it up ?

 

Sincerely

-bino-

 

the CAM drivers are in a text file called eagle.def in version 4, I

don't have v5, so it may be different there. the file includes

documentation and can be editted.

another issue would be: exactly what are you measuring? are you truly

measuring the board outline object or just the drawing area that

contains it? perhaps the actual objects  are identical but one driver

declares a slightly larger area for the drawing.