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 pick and place file - metric mils conversion 

Last post Fri, May 9 2008 12:07 AM by archive. 2 replies.
Started by archive 09 May 2008 12:07 AM. Topic has 2 replies and 1191 views
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  • Fri, May 9 2008 12:07 AM

    • archive
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    pick and place file - metric mils conversion Reply

    Hi All,


    Assume your board is designed with mils setup and you use mils. Is there a method to generate 'metric'  pick and placement report WITHOUT changing the original setup file ( already use mils ). Because the conversion is a mess for the brd file. I takes too long time ( and may convert 24.99 instead of 25- if the accuracy setup is not optimized) and this may result many DRC's in the brd file.

    And I wish the the allegro will give metric and mils for the same time in the future. Especially for measuring some distance .

    Thanks for the answers.

    Ahmet OZSOY


    Originally posted in cdnusers.org by AhmetOzsoy
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  • Fri, May 9 2008 9:53 AM

    • archive
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    RE: pick and place file - metric mils conversion Reply

    For 1MM, what allegro should answer?

    39.37007874....... and so on.


    Changing unit ans you ALWAYS have roundoff problems

    MM to Mils: divide by .0254 : heavy roundoff problems
    Mils to MM: multipli by 0.0254: only accuracproblems:

    I have chose to work ONLY with MM's


    Originally posted in cdnusers.org by jch teyssier
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  • Sat, May 10 2008 11:53 AM

    • archive
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    RE: pick and place file - metric mils conversion Reply

    I can give you a round-about way, if you don't like to re-specify the database to get the MM pick-n-place.

    Out put the X-Y file to excel
    Create a formula to make the conversion in excel
    Output the file in .txt format

    You can then cludge it back into a placement.txt file and import that to a MM database.

    If I REALLY felt I needed to do that I would. I would prefer to change the database (setting MM decimals to 2 places) and export from Allegro. I don't see rounding as a real issue now-a-daz. Fab vendors couldn't really care about your accuracy. They care LOTS MORE about fabrication issues (line widths, spacings, impedance, etc.) They can pretty much drill anywhere; they worry about their own fabrication accuracies; and being manufacturable.

    Just being me. :)
    Mitch


    Originally posted in cdnusers.org by cadpro2k
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Started by archive at 09 May 2008 12:07 AM. Topic has 2 replies.