Thread: Sheraton 9A Spindle Bearing Grooved

What are the Dimensions of the parts at the moment.

Depending on the amount that the Bore maybe oversize by (also check for ovality) you may be able to get by,by just honing the bore with the appropriate cylinder hone.

If the bore is not excessively worn you could also consider getting the Shaft Metal Sprayed or Hard Chromed.

Dont think it is a very good idea to put to much load on the Bearing cap.

There should be some members on here that should be able to supply you with original dimension for the Bore and Shaft,at least that way you can see what tolerance there was and do your calculations to see where yours are at.

pipeclay,
thanks for taking the interest.

Using my new, metric, unbranded, uncalibrated (Chinese ?) micrometer, the sizes are;
- front 46.02 mm = 1.812 inches,
( 1 13/16 inches = 1.8125 inches ),
- rear 34.91 mm = 1.3744 inches,
( 1 3/8 inches = 1.375 inches ).

At TAFE college tonight, the teacher expressed opinion that the housing should be OK with a squeeze of 20 thou = 0.5 mm.

Further, he suggested that one solution could be a thin steel (stainless) precision sleeve fixed to the spindle.
Apparently these are commercially available to repair precision fits to high speed seals.
Not sure just how the sleeve would be fixed, it may have to be ground after gluing.
He thinks the duty on a hobby lathe would be within the capabilities of such a sleeve.

Thanks for the suggestions on honing, metal spraying and hard chrome.

Happy machining,
John.

If you go the route of a Speedy Sleave you may find that you will need to use 2 as for that diameter shaft and length I dont think they are available.

You will have to try and fit the Sleeve or Sleeves to an un damage section of your spindle.

The sleeves are a size for size fit to the existing shaft,I have never seen or heard of them being retained by any type of retaining compound.

if you use the sleeve you will more than likely have to make your own installation tool as the tools normally supplied are of limited length and wont allow you to place the sleeve onto your spindle in the desired position.

Why dont you chase the appropriate sleeve or sleeves up CBC bearings I think are Aust distributers (search for RAWHIDE) and take your spindle to your class and fit it there.

Bit off topic for a machine use instruction class but a usefull bit of fitting experience that all your class may be able to learn from.

I can only see the way to proceed is to apply the correct fix...And to fix it correctly would not be cheap...

The spindle has to be metal sprayed and ground, to do this correctly requires a person with the knowledge of how accurate the spindle needs to be setup.. I really doubt if you took it to any metal sprayer they would actually do a proper job..

Then the housing has to be line bored out and bushed with new bearings.. At least that is the way I would most likely proceed..

RC have you had bad results from items being sprayed in the past.

Originally Posted by pipeclay

RC have you had bad results from items being sprayed in the past.

No on the contrary all the metal spraying I have had done has been more then adequate... But I have only had it done for sealing areas where there is a wide tolerance for concentricity..

Spindles need to be set up correctly to be ground correctly... I get my metal spraying done at an engine reconditioning shop...However I doubt that shop has employees with the necessary knowledge to correctly set it up for grinding so the spindle nose runout falls within the necessary specs which is less then 0.01mm for a lathe under 500 swing..

Just general spraying and grinding that would cost $200+ anyway(going by jobs sizes I have had done), more if done correctly...