ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello all
I recently 'rescued' a Beogram 3000 which appears to have had some rough treatment from whoever took it from its original owner.
It is now spotlessly clean, the cover had been polished to clear again (this took several days intermittently), the enclosure for the torsion lid springs has been repaired etc.
The motor and platter bearing was cleaned and re-lubricated and all functions now work correctly except I hear a soft 'schoop...schoop' noise when the motor and idler wheel rotates the platter. The motor is almost totally quiet and its driveshaft is not bent.
The soft noise seems to come from the idler mechanism. I have removed the idler wheel and chucked it in my lathe. I then set up a runout clock the lathe bed to check for a flat spot or out of roundness of the idler wheel and found a tiny amount of out of round but IMO not enough to cause the noise.
Thereafter, with the idler still in position in the headstock chuck, I used a diamond grinding tool to true the idler wheel and thereafter, no out of roundness.
I went further - I then chucked the idler wheel spindle in the lathe and again found a minimal amount of shaft wobble but trued the shaft as well using a very small plastic mallet with one or two light taps.
So everything around the motor, the idler wheel and the platter spindle is running true and up to speed.
Some weeks ago when I first started working on the 3000, I wiped some grime off the idler lifting lever - the part made from beryllium copper. Near the rounded tip of this lever, I found a black blob which looked like a spot of black grease. When I wiped it away, I saw a small hole near the tip of the lifting lever.
In hindsight, could this 'blob' have been a small 3mm diameter rubber that I thought was dirt? And the small hole at the tip of the lifting lever - was this the hole into which the rubber was fitted?
Since I have a lathe, I ground a little piece of rubber to fit into the hole near the lifting lever's tip but it made no difference - the 'schoop...schoop' sound is still there.
Do you have any advice for me please?
dauphine/andre
The noise could be from variations in the hardness of the idler wheels rubber compound due to age.They can become quite noisy as they harden.
There is a small flat-headed fiber blob fitted to the end of the lifter, running in the groove in themetal part of the idler wheel. It has a little grease on it so will collect a little dust and dirt andcould easily be mistaken for just that.
Martin
My Beocenter 3500 - which includes a Beogram 3000 - has the same problem with the idler wheel. I can tame it for a while with acetone but the noise would come back after a few days.
Terry's rubber wheels anyone?
Jacques