Originally Posted by
JohnG
I have unboxed a TTS 8000, and checked the spindle for Side to Side Play, I have detected, what I will refer to zs a excessive movement, one that I am not detecting in the other TT's I have.
I don't know anything about the bearings engineered design or how much side to side movement there should be in a unused bearing, so I will not pretend that I have any ideas for what engineered tolerances there should be.
As a result of receiving a few guidelines on how to remove a Bush from a encapsulated bearing housing, I sourced a tool that I feel can be used to carry out one of the methods in a controlled manner.
The method I intend on using will only be attempted after I have sought further advices, but as it seems at present to not put any parts at a real risk, if set up properly, I will learn as much on the operation and any unknown to me risks, that I can.
With the stimulation of a method to remove a Bush that I could comprehend, I was motivated to unpack the TTS 8000, and see how secure the spindle felt in the housing.
The amount of movement I have felt does not make me feel that the Spindle is seated as well as I feel it should be, it is not in keeping with the way I have come to understand the intentions of others, that I know that have worked on "improving" bearings.
With the concerns felt about the amount of side to side movement, and the audible noise that can be detected when checking for movement from the spindle hitting the side walls of the housing, I got brave and had a attempt at what Mark did, and successfully removed the Spindle from the housing, and similar to Marks discovery, my one was very dry. The spindle did not have a amount of lubricant that could leave a residual on my fingers.
I am not at rest with this as a find, and intend on making changes to this situation, I feel a correct lubrication, will be a preventative exercise.
I can see into the Housing Shaft and there is a low level Bush, seated down in the bottom, that does not touch the base, there is a non metallic liner sleeve that sits above the lowest bush, with what feels like a tiny gap between the two components. The non metallic sleeve liner is of a length that it sits directly under the bush seen at the top of the shaft, there feels like there is tiny space between the top of the non metallic liner and the bottom of the high level bush.
The internal diameter of the Bushes are slightly smaller than the internal diameter of the non metallic sleeve.
I am assuming the gaps created between the Bushes and Sleeve are to allow a Lubricant to travel as well as expand.
Rightly or wrongly, I intend to attempt to tighten up the tolerances between the spindle and bushes, by exchanging them. So I will pursue the investigation of the supplied method to remove the bushes, the sleeve will be removed temporarily as well.
On the bottom of the spindle there is a half round nipple machined as part of spindles production onto the bottom face of the spindle.
This acts a the low friction rotation point, it is not easy to make out, but there seems to be a abrasive wear in the bottom of the housing on the base, again due to the unpolished appearance of the wear, this looks like it could be having a unwanted effect on the operation.
Again rightly or wrongly, I will be looking into the idea I have of placing a 0.5mm POM thrust pad in the base of bearing housing as a preventative measure to protect the housing,as well as supply the nipple a much smoother surface to rotate on.
This is heading toward the type of conditions, I would like my vintage TT bearing to function under.
I will feel more at rest if I can achieve this.
The method to remove the bushes should be reversible, so it can be returned to the original parts, if all goes well.