Rounded rectangle maximum corner radius

Bug #1668020 reported by Michal Vanco on 2017-02-26
This bug affects 2 people
Affects Status Importance Assigned to Milestone
Seth Hillbrand

Bug Description

For rounded rectangle pad, the radius of the corner is now specified only as a percentage of the pad width. It would be very helpful to have the possibility to specify maximum radius in mm also. IPC7351C recommends corner radius of 25% of the pad width with maximum 10mil (0.25mm). KiCad now supports only the first part of this recommendation. Of course there exists a workaround but ...

Bob Cousins (bobcousins42) wrote :

Can't the footprint designer just use a calculator to get the right radius?

I think the right place for applying footprint conventions is in the relevant library spec, e.g. for official libraries, supporting with verification scripts e.g

Michal Vanco (michal-vanco) wrote :

Well ... yes ... footprint designer certainly can use the calculator to calculate the right radius. In fact, this is the workaround I was talking about. But it would also be helpful to be able to specify the radius in mm.

I don't think this is the "library convention" thing. In fact KiCad libraries are not IPC compliant. But if I want my own libraries to be compliant with IPC, in some cases (for large pads) I need to specify exact radius.

I think of this as a feature request. Not as a bug.

Jeff Young (jeyjey) on 2018-02-19
Changed in kicad:
importance: Undecided → Wishlist
status: New → Triaged
Seth Hillbrand (sethh) on 2018-07-07
Changed in kicad:
assignee: nobody → Seth Hillbrand (sethh)
milestone: none → 6.0.0-rc1
status: Triaged → In Progress
Rene Poeschl (poeschlr) wrote :

This doesn't really need a file format change either. Kicad outputs the current radius next to the radius ratio. If the radius field would also be editable kicad could calculate the required ratio from whatever is entered there. (would not be the perfect solution but something that can be added earlier)

Seth Hillbrand (sethh) wrote :

@Rene- That make sense. You edit one or the other but not both. The other fields becomes driven. We still only write the roundrect_rratio value, regardless if it is driven or driving. I think we could do something like that for 5.1 in the dialog re-work if it's important to the librarians.

KiCad Janitor (kicad-janitor) wrote :

Fixed in revision 9cafe65e841786fce91720de9a5d212d7876b75f

Changed in kicad:
status: In Progress → Fix Committed
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