Padstack Drill Tolerance

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   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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rrix Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 10 Jan 2018 Status: Offline Points: 34	Post Options Post Reply Quote rrix Report Post Thanks(0) Quote Reply 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.



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716	Post Options Post Reply Quote Tom H Report Post Thanks(1) Quote Reply 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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chrisa_pcb Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 29 Jul 2012 Location: San Diego Status: Offline Points: 772	Post Options Post Reply Quote chrisa_pcb Report Post Thanks(0) Quote Reply 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?

rrix Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 10 Jan 2018 Status: Offline Points: 34	Post Options Post Reply Quote rrix Report Post Thanks(0) Quote Reply 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.

ransonjd Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 15 Nov 2016 Status: Offline Points: 139	Post Options Post Reply Quote ransonjd Report Post Thanks(0) Quote Reply 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.

ransonjd Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 15 Nov 2016 Status: Offline Points: 139	Post Options Post Reply Quote ransonjd Report Post Thanks(0) Quote Reply 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.