During your possession of this machine has it always had this issue? The 
gradual pace of the deviation points to mainspring or main (1st) wheel issues. 
Set mainsprings are uncommon on DD machines. This is usually caused by degraded 
lubricant residue on the MS or stiff material on the barrel floor or lid 
catching the spring edges. It can also be due to a wear mismatch between 1st 
wheel and worm, especially if it’s cyclic error, If these came from two 
different motors. There can be other causes, less likely. I would put my money 
on sticky mainspring.

Sent from my iPhone

> On Dec 20, 2019, at 1:28 PM, Ron L'Herault via Phono-L <phono-l@oldcrank.org> 
> wrote:
> It’s not a flutter or wow, but rather a more gradual speed change so I doubt 
> it’s the surface of the governor disk but I will recheck.   
> Ron
> From: Phono-L [mailto:phono-l-boun...@oldcrank.org] On Behalf Of Andrew Baron 
> via Phono-L
> Sent: Friday, December 20, 2019 12:47 PM
> To: Antique Phonograph List
> Cc: Andrew Baron
> Subject: Re: [Phono-L] Edison DD problem
> Governor flywheel friction surface cleaned of ALL old residue, polished, and 
> fresh oil on the leather friction pads? Also, look closely at the flywheel as 
> it spins to verify that your screw loosening/tightening on the weight springs 
> indeed yielded the desired result. Run the motor as slowly as it will run 
> when making this observation, if there’s any doubt. The slower speed will 
> more readily reveal eccentricities. Check also for your problem at various 
> tensions of the mainspring — is it just as bad across the board, or more 
> noticeable when more fully wound or more relaxed? Deviations here would point 
> to mainspring coils sticking together, despite your observations. A 
> mainspring under tension, where the turns of its coils bear hard one upon the 
> other, will exhibit different behavior than what you can observe in a static 
> test. It may be necessary to do a thorough cleaning of the spring out of the 
> barrel, as well as the barrel muck itself, followed by a reinstall with 
> appropriate new lubricant. The most perfect regulating system (governor 
> setup) won’t iron out uneven delivery of power to the governor and turntable 
> platter. The underlying fault will be somewhat muted by the turntable 
> platter’s flywheel effect, so it is likely more pronounced than it would seem 
> with the platter on the spindle, and may be easier to pin down with the 
> platter removed. You’re already doing all the right things by being observant 
> and dealing with the visible issues, now look more closely for the subtler 
> ones. There are other possible causes beyond what I’ve outlined above, but 
> it’s best to check for these issues first.
> Best of luck and keep us posted.
> Andrew Baron
> Alpine Clock Repair, LLC
> Santa Fe
> On Dec 20, 2019, at 9:08 AM, Ron L'Herault via Phono-L <phono-l@oldcrank.org> 
> wrote:
> If anyone is still here on the mailing list(s)  What is your take on the 
> situation?  Problem: Edison Diamond Disc single spring motor does not keep a 
> constant speed. Spring does not seem to be caked with grease, judging from 
> the several inner coils one can pull out without having the whole spring out. 
> A small amount of grease was added. Old grease under the bull gear plate was 
> removed and fresh grease added. Governor screws have been loosened, and 
> tightened after the governor has spun around for a while. bearing points are 
> well oiled, gears lightly greased. Solution(s)?
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