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In Reply to: Re: TD125 owners and others with strobed TTs - any of your strobes dead still? posted by albertoderoma on September 11, 2006 at 17:50:25:
...I mounted a fine tip Sanford "Sharpie" marker to a "third hand" device and very carefully moved it closer to the spinning motor shaft (with the pulley removed), until it just barley contacted the shaft. This marked the run out and gave me an idea of which way to bend the shaft.The Thorens motor's shaft is very soft metal and will bend easily. I used the "box end" of a small combination wrench over the shaft to apply the force needed to bend the shaft in the opposite direction of the mark made by the sharpie.
It took a bit of time but turned out well. I have since fixed a half dozen Thorens motors this way.
--
Al G
Follow Ups:
Awesome - if a bit scary.Thanks a bunch!
Alberto-Nothing to be concerned about, just easy does it, as Al indicated the Thorens shaft is rather soft so be gentle, invariably
the shaft will end up being bent slightly the other way, over compensation to one degree or another is inevitable.BTW you'll never achieve dead center, perfectly straight once the shaft is bent, some folks have reportedly achieved perfection by getting the shaft as straight as they can and then filling it down while the motor is running, I've never tried this as for one absolute
straight isn't really necessary once it's straight enough to clean up Piano notes its just fine.The easiest method I've found was suggested by a German Thorens owner on the Vinyl Engines Thorens specific forum (something I'd think any Vintage Thorens owner would benefit by there are some very heavy Thorens obsessive enthusiasts, an excellent resource)
The idea is drill a small hole slightly smaller than the shaft dia. in a very small wooden dowel achieve a tight fit by opening the hole with a small. rats tail file, you want a tight fit, leave the belt on the pulley (removing TD 125 Pulleys can be an exasperating procedure) then rotate the inner platter manually and the small dowels movement provides an more perceptible exaggerated range of the bent shafts eccentric orbit yielding a more precise result with less frustration and anxiety.
The dreaded Thorens wobbling pulley is anything but rare, as the first time an owner decided to haul his table to the shop or whatever without removing the outer platter, hits a bump or brakes to hard the outer platter becomes detached and the Platter hits the pulley, it doesn't take much of a hit.
Hi Fred,Thank you for your always thorough and useful replies.
Looks like I got a project for this week-end ...
AlbertoThis procedure is a bit more difficult to describe than actually perform.
it's actually kind of fun, and the result will put a big smile on your face the first time you hear music, now devoid of the wow and flutter.
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