[R-390] Fundamental question - setscrews

[Don Reaves]

It is counter intuitive, but I've had some success tightening a stuck screw
ever so slightly first to break the tension.  Righty tighty, lefty loosey.
There must be some law of Newtonian physics that explains this phenomenon.


On Wed, Nov 14, 2012 at 1:13 PM, Mike A <mikea at mikea.ath.cx> wrote:

> On Wed, Nov 14, 2012 at 09:45:27AM -0800, John Saxon wrote:
> > Another simple question...
> >
> > Straightforward goal:  remove a knob
> >
> > Problem: Bristol setscrew appears to be welded to the control shaft.
> >
> > How to loosen it up?
> >
> > I am afraid to twist any harder for fear of breaking my Bristol wrench.
> >
> > Suggestions?
>
> Apply a drop of penetrating oil, wait a few hours, try again?
>
> If that still fails, then try alternating these:
> o   touch a hot soldering iron to the setscrew long enough to heat-soak
>     the metal; then
> o   spray the setscrew with some freeze spray or other -- say canned
>     air, upside down.
> The idea is to try to break it free using thermal expansion and
> contraction.
>
> --
> Mike Andrews, W5EGO
> mikea at mikea.ath.cx
> Tired old sysadmin
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Don Reaves  W5OR WD2XSH/15
8101 Barrett Rd. Roland AR 72135
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