Back in the "good ol' days" before surface mount, the wire leads found on through resistors had a tolerance of ±.002" I think it'd be safe to apply that tolerance.
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Monday, August 28, 2006 7:05 PM
To: [log in to unmask]
Subject: Re: [DC] Hole diameter specification
I'm curious about the logic that makes your hole size "just right".
I remember a solderability study that said capillary action works best somewhere between 11-14 mils over the lead size. Auto-inserters like to have a little more than that though...
Using your .064 leads (nominal size?) and the midrange (Level B) of IPC-2222 Table 9-3, your range would be .072-.091, but that is without a lead diameter tolerance.
As the lead diameter tolerance increases, the acceptable hole diameter range decreases.
I would say the ideal size is probably more like .080
Interesting side note: I looked all over the internet to find typical wire diameter tolerances based on the AWG sizes... couldn't find anything.
So what IS the tolerance on 14 gauge wire?
onward thru the fog,
Jack
On 8/28/06, Tempea, Ioan <[log in to unmask]> wrote:
>
> Thanks,
>
> I have checked it and it is not what I hoped. My heart's desire was to
> see that the hole diameter was too big, but it actually is just right.
>
> Best regards,
>
> Ioan
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of
> Susy Webb
> Sent: Monday, August 28, 2006 10:13 AM
> To: [log in to unmask]
> Subject: Re: [DC] Hole diameter specification
>
>
> The information you are looking for is in IPC-2222. Look in section 9.2.2"Plated Through Holes".
> Susy
> >
> > From: "Tempea, Ioan" <[log in to unmask]>
> > Date: 2006/08/28 Mon AM 08:19:11 CDT
> > To: [log in to unmask]
> > Subject: [DC] Hole diameter specification
> >
> > Hi,
> >
> > I have a TH cap that has 0.064" diameter pins and 0.089" diameter holes.
> Are the holes properly designed?
> >
> > I have skimmed IPC-2221 and IPC-D-279, but cannot find any formula
> > for
> calculating the diameter of the hole from the pin diameter. Where can
> I find such formula?
> >
> > Thanks,
> >
> > Ioan
> >
>
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