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Padstack Drill Tolerance

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rrix View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rrix Quote  Post ReplyReply Direct Link To This Post Topic: Padstack Drill Tolerance
    Posted: 25 Jun 2019 at 12:57pm
Is there a way to set the default drill +/- tolerances on the through-hole padstacks that PCB Library Expert creates for OrCAD PCB version 17.2.048?  It's defaulting to zero.
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Tom H View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2019 at 1:11pm
The current version of Library Expert does not have a Drill Tolerance feature. 

Mainly because only Cadence CAD tools supports that feature and all other 23 CAD tools do not. 

We'll take a look at this in future releases. 

V2019.04 is the current release. 

V2019.05 is scheduled for release the week of July 22. 

V2020 is scheduled for release before September 2 (Labor Day). At least in beta because it's a total rewrite of the UI. 

V2021 is scheduled to be released summer 2020 and will support schematic symbols and many new features as it is a 100% rewrite from scratch but will closely match the V2020 UI. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote chrisa_pcb Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2019 at 5:04pm
The key here is where do you want the information to come from?

We have a Fabrication Tolerance setting. Is this usable as the allegro padstack tolerance setting? Or do you need something more? Are you looking for each padstack to have a tolerance, or will a global tolerance that you set(i.e. from a cell in the grid) work?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rrix Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jun 2019 at 5:59pm
Default fabrication tolerance seems to be about 0.05 mm.  

I have some pad stacks at that setting, but my general standard is a +/- tolerance of 0.08 mm.

In Allegro, each pad stack has a positive and negative tolerance (they can even be different).



A global drill tolerance single value entry that populates the positive and negative drill tolerances each with that same number would work for about 90% of the pad stacks I'm creating, then if something else is needed, I can manually change it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ransonjd Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2019 at 7:31am
Altium has supported drill tolerances on holes since version 17.1 or possibly earlier. I also would appreciate this feature.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote ransonjd Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jun 2019 at 7:34am
Altium doesn't require a tolerance, so I leave it unset and specify a default tolerance in my fabrication drawings for most holes. I would like if this could remain an option for Altium.
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