[Jukebox-list] Rockola Tempo2 Speed

[Bill Signor]

Bob,
No I'm not in a 50hz area. I agree it is probably the ratio of the spindle 
to the idler wheel. It would happen early on as well as 30 mins into 
playing. Now it seems corrected with the tape, but can't rule out motor 
either. Problem is when you are so focused on listening to the sound speed 
sometimes you think its off especially if you have a 45 that warped like so 
many are (alittle off center)

Bill
----- Original Message ----- 
From: "John Robertson" <pinball at telus.net>
To: "Jukebox mailing list" <jukebox-list at lists.netlojix.com>
Sent: Monday, November 05, 2007 7:47 PM
Subject: Re: [Jukebox-list] Rockola Tempo2 Speed


> Bob Ellingson wrote:
>> At 02:52 AM 11/5/2007 -0500, you wrote:
>>
>>> Bill, keep it simple. If the tape increased your speed to the correct
>>> speed, that tells you that the ratio is slightly off between either the
>>> motor end piece which engages to the idler wheel, or the idler wheel is
>>> slightly too small.
>>
>> The size of the idler wheel will not matter!  If you calculate
>> the ratio of the idler wheel to the motor spindle, and then the ratio of 
>> the turntable to the idler, you will see that it
>> cancels out:
>>
>>        Spindle         Idler            Spindle
>>       --------   X   ----------   =    ---------   =  Speed
>>         Idler         Turntable         Turntable
>>
>> The problem has to be friction, slippage, or mis-match
>> of the spindle-to-turntable size.  This isn't in a 50 Hz
>> area, is it?  Maybe the spring that enlarges the spindle
>> for use in foreign areas has fallen off?
>>
>> --Bob
>> =======================================================================
>> Bob Ellingson bobe at halted.com
>> Halted Specialties Co., Inc. http://www.halted.com
>> 3500 Ryder St. (408) 732-1573
>> Santa Clara, Calif. 95051  USA (408) 732-6428 (FAX)
>>
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>>
> The only turntable drive wheels where there is a problem with ratios are 
> the two step idlers that were used in the 50's. There they divided the 
> motor speed by the ratio of the two wheels on the idler as well as the 
> ratio between the turntable and the motor spindle. As I recall the 
> Wurlitzer 1250 through 1650 all used this, as did Rockolas up to the early 
> 60s (or is it the late 50s?) the 1454 for one used the two step idler.
>
> However by the time of the Tempo they only used a single wheel idler. So 
> then lack of enough friction is the only thing you have to sort out when 
> the speed is low - assuming the turntable motor and the turntable main 
> bearing are both running freely. A few drops of nail polish remover will 
> revitalize those idlers - use the non-acetone version though.
>
> John :-#)#
>
> -- 
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call 
> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
>                 www.flippers.com "Old pinballers never die, they just flip 
> out"
>
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