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Track too wide to backoff from drill

Kommentare

4 Kommentare

  • Boss .

    Hi Peter,

    I asked support and Mint Tek the same question. Apparently there are still photo-plotters in use so the 'check' option is provided. It was apparently a fairly recent requested feature. Simply uncheck what you don't require.

    MinTek also gave some interesting information about PCB production and what they perform before sending designs to be manufactured.

    If I understood correctly, the copper layer artwork is produced with all holes filled (so backoff is not an issue), it is then etched and finally drilled. This removes any errors from etched pad hole having to align perfectly with a drilled hole as any misalignment would impact on any through hole plating.

    So I believe most users can safely ignore backoff errors. Also it would make sense to supply the copper layers with holes filled to save additional work.

    From memory they also said silkscreen on pads is not an issue as it used to be making the paste or solder unreliable as they mask the silkscreen layer with the pads to avoid these areas. Obviously it's best to avoid this for legibility, but nice to know there are some checks in the process.

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  • Peter Sarro

    Hey Boss:  Thanks for responding so quickly:  Yes, of course, I should have thought of photo plotters which would explain it.  Thanks for the explanation; going forward I'll have to remember to keep that rule unchecked.  

    Perhaps there's a way - I've not found it yet - to option a custom Design Rule Check configuration so that one can save certain manufacturing options (or would that be possible with a DT File?); it would probably be useful when dealing with more than one PCB fabrication service since not every one is exactly the same.   

    I'm amazed at how well DesignSpark works, and for a free tool it's simply staggering !  Really looking forward to the next iteration! 

    In any case, thanks again !

     

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  • Boss .

    Hi Peter,

    I use the DRC options selectively and work through them a few at a time, starting with net completion and dangling tracks. Then the various Spacing options and finally Manufacturing.
    If you do all at once the list can be overwhelming.

    Yes I'm also amazed at DSPCB and have used it since V3 and each release just gets better. V8 will be great with the new measure tool, it's currently in beta, but I'm told soon to be released so wait for official release now.

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  • Peter Sarro

    Yes, I have been using the DRC in increments and it works out to be less overwhelming as you say.

    I have noticed some issues with the current Measure tool;  glad to hear there will be improvements to it.

    Thanks for the additional info.

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