X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to; bh=YUH6fjLCoshJ32xroxPva7YnjjNZBxIyqijdplm/Ouc=; b=FMvCMKDOUnrzCeJSRWNpPMFKLSR6p0mN4y+3zHd+c9oV0fcQcOrL5u1E3PlNamDv4e rv8Vt45GzVpwrEqEf3M1QFi4o1TPC//q6QPu7gnJcYn8PYeRoNG4yb2m/9UXnQfMnMnO VLDToVql3iszWptclNONgs5tpn+iabKLysZz5ISVRcKBHpXhi82pEnUByYIiy89OtCrA eTac90DIoWVUhKTkZhNPpDKpGTdst6Y8RTuo33wEomYBG95ro97lbz1/9SxNGrOC9aFg rc3k76FiQI2z+XkQXaznz9sT1gSMBme4V1oUBdjpQFo5WETaS1/IJ1g8IloVW+MCeQ4h leFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to; bh=YUH6fjLCoshJ32xroxPva7YnjjNZBxIyqijdplm/Ouc=; b=IDCuBdua7WbBpxs+ebnxJsR6brlgz0WPps0BBskyBQlIcQ/YkDPnITCSW0naeOYODl 4bEQxqtEup4tUWBV8EEvNLEnhXV6CjVo31I5HW9MTYC8IeAvbKWw2uEBIj8I5hljjv70 kB1fgARARdc2cEm4wCJyo8hmP5HBiKGY1DQR9Bc3RjuYFUZMsB1Ede/GcFULkYYuiLIX Rips8ksQUsQHWygIo6gTw4n1o11Ku7Zc5LCmxjs2CSyk28f6Uz1eY2v/QMP9O2t9Yh5b vuzQEmWB0cX30xdWx1/KQLXnkzs+ahyO7aT7/n4IliLGHTy0JGXm73TBmPGcr3RZUr6t Nr2w== X-Gm-Message-State: AFeK/H0UGbR2r/Vq+CUl7O8MSe+pHgaNAnglPe0gg4DolZukFLZhfD/L60ceD/oE7gb50GdPWI2oIbq6+SCOHg== X-Received: by 10.159.32.38 with SMTP id 35mr64903uam.12.1489532220761; Tue, 14 Mar 2017 15:57:00 -0700 (PDT) MIME-Version: 1.0 Sender: froggytoad AT gmail DOT com In-Reply-To: References: <20170314194424 DOT a2f383cf15dcf3ae8e204261 AT gmail DOT com> <7000e948-3f4a-5676-d1ec-6017daad0cdc AT fastmail DOT com> From: "miloh (miloh AT froggytoad DOT net) [via geda-user AT delorie DOT com]" Date: Tue, 14 Mar 2017 15:57:00 -0700 X-Google-Sender-Auth: PPlnMEoj8pYPvtnBzJCt0ygGbXU Message-ID: Subject: Re: [geda-user] [pcb-rnd] tEDAx footprint load support To: geda-user AT delorie DOT com Content-Type: text/plain; charset=UTF-8 Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk Why not set plating to '0' for a unplated hole that is treated as a mounting hole? By the way, mounting holes are really different across fabrication industry and the current discussion of 'do unplated holes' exist doesn't really capture that. Why is that? I'm sure without as much experience as others in the thread that I've seen insulated, conducting, unplated, masked, unmasked, dot unmasked styles for mounting holes all in a wide swath of electronics manufacture (no aerospace though). A variety of purposes and conditions for use in differing designs. As for clearance, these values affect long term stability and usability. otoh, part packing in design, and repair/reworkability down the road. Blind and buried vias are an interesteing topic, but to me not relevant to footprint support - what do others think? -r miloh alexander On Tue, Mar 14, 2017 at 1:09 PM, Chad Parker (parker DOT charles AT gmail DOT com) [via geda-user AT delorie DOT com] wrote: > It's because if you accidentally put too much torque on the screw, it can > crack the plating and cause failures. This could result in debris that could > short something intermittently, or could potentially cause the connection to > fail on one of the other copper layers. > > It only has to happen to you once on a really expensive project...! > > On Tue, Mar 14, 2017 at 3:55 PM, Girvin Herr (gherrl AT fastmail DOT com) [via > geda-user AT delorie DOT com] wrote: >> >> >> >> On 03/14/2017 12:31 PM, Chad Parker (parker DOT charles AT gmail DOT com) [via >> geda-user AT delorie DOT com] wrote: >>>> >>>> - Holes without plating is common. >>> >>> >>> Common, but not essential. The same footprint could work fine with plated >>> holes. >> >> >> Not always. In much of my work I'm not allowed to use pth for any kind of >> mounting hole, which would include holes for screwing into things like heat >> sinks and packages that might be included in a footprint. >> >> >> --Chad >> >> +1 >> I was in the aerospace industry for years and I agree. Mounting holes >> shall not be plated. I no longer remember why. Probably due to a failure >> or two traced to the pth mounting holes - A reliability issue. Ignoring >> history and thinking outside the box is not always a good thing to do. >> >> Girvin Herr >> >