[Elecraft] Concentric knobs??

[hb9ari]

Hello Guy,

I think that you have found the good explanation!

May be some of these knobs don't get a correct or sufficient  pre-aging (?)
procedure before leaving the factory; at my QRL pro, we get this kind
of problem with molded plastic enclosure breaking some time after
they were bee assembled.

In French, we are speaking of "retrait" but i don't find
the correct translation!

My best 73,
Rudi, HB9ARI

On 23.06.2011 19:31, Guy Olinger K2AV wrote:
> Having managed to break a few myself (have to remind myself I'm not
> rebuilding an auto engine), I think what is going on is that the knobs
> are (or were) still curing, causing them to shrink a tiny bit after
> being tightened on the shaft.
>
> I think the curing accelerates after being put on the radio because
> they have free air around them, instead of being in a bin or box. I
> found the screws TIGHTER a week after I put the knobs on.  I simply
> loosened and retightened them to "pinky torque" and no problems since.
>
> Pinky torque is to use your pinky ONLY as pressure on the allen wrench
> when tightening. One probably does not even need that much.
>
> 73, Guy.
>
> On Thu, Jun 23, 2011 at 1:46 AM, hb9ari<hb9ari at bluewin.ch>  wrote:
>> Hi Brian,
>>
>> Thank you for the reply.
>> As i bought an assembled K3, i don't
>> tighten the screws.
>> As Tim explained in his message, this "problem"
>> was present sometimes in a particular batch.
>>
>> I will send an email to the "parts" department.
>>
>> My best 73,
>> Rudi, HB9ARI
>>
>>
>>
>> On 23.06.2011 00:50, Brian Maynard wrote:
>>> I had the same problem at the time I built K3 #4974. Elecraft sent
>>> replacements right away (the usual excellent service), and coached me not to
>>> over tighten the set screws (two per knob). The knobs are pretty soft and
>>> deform easily if over tightened.
>>>
>>> -----
>>> Brian,  op K1NW
>>> --
>>> View this message in context: http://elecraft.365791.n2.nabble.com/Concentric-knobs-tp6502754p6506455.html
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