[HAM] WD-40 - Vibrato scanner - M-102 ??

[David Damroze]

    Right now I have just the gear housing assembly with the rotor still 
attached sitting
  out on the the balcony with some denatured alcohol poured into it 
hoping the
solvent will soak into the bearing and loosen it up.
  I go out and give it a turn once in a while, but, it still seems 
pretty stiff.
  Fortunately, I still have the T-412 to play on . That scanner just 
took a finger nudge to get going.

  David D.
On Jun 27, 2008, at 7:33 AM, David Anderson wrote:

> David,
>
> I've found that the solution depends in part on what the device in
> question has been oiled with over the years. Sometimes the sticky
> stuff comes off easily, and sometimes it's pretty persistent. It may
> be the case that the bearing ran dry at some point and the last oil
> on the surface got overheated from friction. In that case, rinsing
> that last oil out and re-oiling may do the job.
>
> Denatured alcohol and naphtha should be available at your local
> hardware store. Just use something to squirt a bit in there. Then, I
> would turn the shaft by hand to aid in cleaning and flush it a bit
> more. Re-oil the bearing and give the oil some time to work its way
> into the bearing. Patience with bronze bearings is often rewarded. I
> read that in the factory, the manufacturers of bronze bearings
> immerse them in oil and use a vacuum to pull the air bubbles out and
> fill all the pores with oil.
>
> The nastiest case I've run across was a Leslie horn bearing that had
> been over-oiled over the years with some horrible-smelling oil. I had
> to soak it in alcohol several times and blow it out with compressed
> air to clean it out, but when I was done, it worked like new.  The
> horn bearing is also one case where you can use air pressure to speed
> up the re-oiling process. You oil it and blow air into it, which
> forces the oil through the pores.
>
> This is all similar to what Steve Leigh has done to revive tone
> generators with sticky bearings, so I should footnote him :-)
>
> David
>
> On Jun 27, 2008, at 1:36 AM, David Damroze wrote:
>
>>   What you say makes sense to me regarding the porousness of the
>> bronze.
>> It sounds like I need to take the scanner apart to clean it. I
>> was hoping I could spray something in there to loosen it up and then
>> re-oil it.
>>    Could I just remove the screw at the bottom to allow the gunk to
>> run
>> out without having
>> to actually dismantle the vibrato ?
>>    What are some products with denatured alcohol that are
>> appropriate to
>> this application ?
>>      I have dribbled a little Hammond oil in there and am giving the
>> bracket a push with a screwdriver
>> once in a while to try to loosen it. It does move with enough
>> pressure.
>> Maybe after it sits over night.
>>
>>
>>   DD
>>
>>
>
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