Padstack Drill Tolerance
Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=2503
Printed Date: 22 Nov 2024 at 6:52pm
Topic: Padstack Drill Tolerance
Posted By: rrix
Subject: Padstack Drill Tolerance
Date 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. |
Replies:
Posted By: Tom H
Date Posted: 25 Jun 2019 at 1:11pm
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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. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: chrisa_pcb
Date Posted: 26 Jun 2019 at 5:04pm
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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? |
Posted By: rrix
Date Posted: 26 Jun 2019 at 5:59pm
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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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Posted By: ransonjd
Date 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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Posted By: ransonjd
Date 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. |