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Autodesk EAGLE
EAGLE User Support (English) Problem with Eagle 6.5
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Related

Problem with Eagle 6.5

Former Member
Former Member over 11 years ago

Sir,

    I am using Eagle 6.5 and I have created PCB design in editor. I am facing the problem of the pitch dimensions of IC packages. When I print the design on paper using PRINT command for making PDF, the pitch(distance between the pins of IC package) don't match with the original IC. For example, If I use DIL 18 pin package then ideally after printing, it should match with all DIL but its not matching and I cannot place the IC on board. I lost 2 boards fabricated in due to this error. Any help would be appreciated.

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  • Richard_H
    0 Richard_H over 11 years ago

    Hi,

     

    how did you produce the manufacturing data? If you print the layout (with the PRINT command) how are the settings for "scale" and "Limit"? Are you sure that you  print 1:1 ?

     

    Regards,

    Richard

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  • Former Member
    0 Former Member over 11 years ago in reply to Richard_H

    Its 1:1 scale is 1 and limit is 0

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  • Richard_H
    0 Richard_H over 11 years ago in reply to Former Member

    Hi,

     

    could it be a matter of the printer? Do you know that you can calibrate  the printer's output in x and y direction in the PRINT dialogue as well?


    Best regards,

    Richard

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  • Former Member
    0 Former Member over 11 years ago in reply to Richard_H

    Maybe. But I don't know the calibration. Could you please tell me for printing 1:1?

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  • autodeskguest
    0 autodeskguest over 11 years ago in reply to Former Member

    On 25/03/14 11:28, Mrunal Ahirrao wrote:

    Maybe. But I don't know the calibration. Could you please tell me for

    printing 1:1?

     

    No, we can't, because that's the point. The calibration is provided to

    account for the printer not reproducing exactly to scale. This is an

    error in the printer; one that is expected but not known in advance. It

    could be manufacturing tolerances or paper shrinkage or a firmware quirk

    or even down to the drivers on your PC.

     

    The way you set the calibration is by measurement.

     

    Create a blank PCB with just a pair of specific length marked-off axes

    in the dimension layer. 10cm long would be reasonable.

     

    Print this at 1:1 with calibrations of 1.0 in both axes

     

    Using a ruler, measure accurately the actual length of the 10cm axes

     

    Calculate the calibration factors by dividing:

     

                       Designed length of axis

        Calibration = -


                       Measured length of axis

     

    Print again with these calibrations and check that you now have the

    correct printed lengths.

     

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