Jack -
The tolerance on wire varies based on process and materials; but for
general purposes solid 14AWG (0.06408" diameter) wires of soft mandrel
drawn materials have a dimensional tolerance of +/-0.0001". Be cautious
of using just gage as the size for wire my simple reference list 10
different gage references with 7 different sets of diametric
measurements.
Jeffrey McGlaughlin, CID
Engineering Designer EAS
4-2-50 room
x-7582 Phone
(614)458-7582 Fax
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack
Olson
Sent: Monday, August 28, 2006 10:05 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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