Stephen:
Yes, I have had the problem also. One thing to check is the amount of plating
on your diodes. The last time I encountered this problem, I found that the
supplier that purchasing was using simply dipped the diode leads into a solder
pot, and the plating thickness varied wildly. By using a different manufacturer,
the problem went away for that run of pcb's. The older diodes were simply kept
on the shelf until the pcb's were recut and the hole made larger.
Stephen R. Gregory wrote:
>
> Hi ya'll!
>
> I'm pretty sure that one or two of you "ol' crusty" types (I mean that in a
> GOOD way), have run across this problem I have a time or two. I have this
> board I'm building in a quasi "prototype/pre-production" run that has a PTH
> rectifier diode installed vertically...some of you have may have guessed what
> my problem is already from my subject, the hole's too small.
> Lead diameter is right around .050" +/- a mil or two, guess what the hole size
> is? .050", +/- a mil or two...that's just peachy ain't it? It goes two times
> per board, and we gotta' build a hundred of these, maybe two hundred.
>
> So tell me, what have all you "old salts" done to make a square peg to fit in
> a round hole? I've had some REALLY GOOD suggestions from some "experts" here,
> one was to get a dremel and drill the hole out (sounds good to me!...snicker),
> another was to get a can of "Freeze-it" and spray the diode leads with it,
> then hurry up and stuff it in the hole before it warms up and expands...that
> sounded pretty keen too, except it's hard to hold the diodes when you're
> wearing mittens to keep from getting your digits frostbitten.
>
> So I told my "helpers" that I really appreciated their suggestions, but that I
> would like to give the technet a chance to offer some guidance to me, and that
> no-way were the suggestions from the TechNet going to be as good as theirs,
> but I wanted to see what popped up...and I would come to them if I needed
> anymore "help"...in other words, don't call me, I'll call you.
>
> I'm sure glad this is email, it would be kinda' hard to carry on this
> conversation with my tongue in my cheek like this...
>
> So, what's the verdict? Am I hosed? I looked around on the NET trying to find
> the same spec'd diode with smaller lead diameters, but no joy. The only two
> companies I found were Motorola and General Instruments, and they both listed
> the same thing that I have now.
>
> Is there any trick that any of you have done to make something like this work?
> I'm afraid if I don't figure something out, I'll be in mittens spraying diodes
> with freeze-it on the production floor...ya' gotta save me!
>
> -Steve "soon to be numb-fingers" Gregory-
>
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