Nancy,

I am not real clear on what the situation is at your end, but I can tell you
what we do here and have been extremely successful at it.

We adopted the suggested criteria for the board design that the equipment
manufacturer recommended. Specifically, we do .014" over lead diameter for
the hole as a general format. We generally have 3 different lead diameters
which relate to 3 hole sizes for automatically inserted components.

It is Friday, so I am bit thick, but I do not understand the RH. So, to
continue with comments on your information, my belief is that it could be a
situation of oversized hole with a possibility of clinch angle and length
thrown in for good confusion. Remember the lead will only take up a certain
amount of the hole and the solder needs to fill in the rest. If the hole is
oversized, and the lead is short, or not at a good holding angle, you could
have all sorts of 'wonderful things' happen as a result.

I hope I am not too far off base on your question. If so, feel free to slap
me around and wake me up. If I can lend any more help (or confusion!) just
holler!

Richard Hamilton
Clemar Mfg. / Rain Bird
[log in to unmask]

> -----Original Message-----
> From: Nancy Trumbull [SMTP:[log in to unmask]]
> Sent: Friday, December 10, 1999 8:41 AM
> To:   [log in to unmask]
> Subject:      [TN] PTH Design question
> 
> Hi Netters,
> 
> First let me wish each and every one of you a Very Merry Christmas and a
> Happy and Save New Year
> from us here in Michigan
> 
> Now my problem: Aluminum Condenser that is being inserted by the RH is
> leaning out of specification.
>  
> I have checked 
>           clinch = OK
>           clinch direction = OK
>            Hole dimensions= 1.1 ±0.1 OK
>            Lead radius = 0.5  OK
> All are with-in standard
> Yes, I know for many of you this may be a very easy question, but I still
> need help.
> Question that is on my mind is for design.
> Is the Hole dimension to large for the Lead radius?
> I do not know PCB design so I would like some information before I ask for
> a design change.
> Or does any one have any other ideas 
> Hey I might be one of the old ones in QA but I'm up for new ideas every
> day.
> I'll keep my thinking cap on until some one gives me a better idea or I
> figure it out
> Thank You All in Advance.
> Nancy
> 
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