[time-nuts] Wenzel Oscillator Repair
Joseph M Gwinn
gwinn at raytheon.com
Tue Jan 20 21:41:05 UTC 2009
time-nuts-bounces at febo.com wrote on 01/20/2009 04:32:15 PM:
> Bruce Griffiths skrev:
> > The relatively low thermal conductivity of the steel can will help
> > considerably in avoiding thermal damage if the heat is
> applied to the joint.
> > If the can were copper it would be much more difficult to avoid
thermal
> > damage.
>
> When I needed to have a McCoy oscillator can opened my trusty good old
> friend Sten did the usual trick of pre-heating the can and then when
> applying heat to the solder the thermal difference is lower and hence
the
> heat-flow away from the joint. Didn't take much time and I think the
> oscillator is 100% intact.
>
> Pre-heating and hot air are his main tools for tricky soldering jobs. He
> has low fatality rate on problems like that. This is why we let him do
> that kind of stuff at work.
I imagine that Sten works *very* fast. I've found that when soldering
thermally sensitive things like small coil bobbins made of nylon that a
high temperature and relatively large iron is best - the terminals come up
to temperature almost instantly, and it's all over before the heat can
spread and melt the bobbin.
Hot air has the advantage over a flame that overtemperature is less likely
with hot air.
Joe
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