[Collins] 75A-4 Dial Spline Lock Nuts

[kirklandb at sympatico.ca]

I use a SMT rework hot air gun with the 1/8" nozzle to heat 
all the screws.

Others technqiques: Varnish remover (in gel so it doesn't run)
Apparently loctite makes a glue remover.

Bill, ve3jhu


> 
> From: "Dr. Gerald N. Johnson" <geraldj at ispwest.com>
> Date: 2006/06/27 Tue AM 10:52:21 EST
> To: collins at mailman.qth.net
> Subject: Re: [Collins] 75A-4 Dial Spline Lock Nuts
> 
> On Tue, 2006-06-27 at 07:49 -0400, Jim Walker wrote:
> > Still working on the 75A-4.  I encountered a problem I have never had
> > before and really need some experience.  I set the end points on the PTO
> > but went to center the dial but cannot get the spline lock nuts loose.
> > I have the XCELITE 99 spline set.  The set screws take the #99-62 pieces
> > and the inside of the lock screws are in good condition.  I have removed
> > the front panel for cleaning and have good access.  To date I have
> > managed to twist the spline wrench into a noodle.  I even shortened it
> > with a cut off wheel to increase the torque.  I've tried ACETONE.  I
> > haven't tried heat as I can't get my solder gun down to the shaft and am
> > afraid I'll damage the dial.  
> > 
> >  
> > 
> > To date there is no damage but no movement (n pun intended) on this
> > problem.  I really need some suggestions.
> > 
> >  
> > 
> > Jim 
> > 
> > KZ5AW
> > 
> Heat may work. Watch out for acetone near the dial it can be as
> destructive as a slipped soldering iron. Maybe heat the side of the
> spline wrench.
> 
> What color is the locking stuff on the screws? Some was stronger than
> the screws. Acetone may work given time to soak in. The real locking is
> in the threads.
> 
> It may not be possible to loosen the dial setscrews. You may have to
> compromise between dial centering and end point adjustment. Maybe you
> can rotate the PTO in its linkage.
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
> 
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