The Shop > Tools
Sieg Super C3 bearing change
iafilius:
Hi John,
if you want to share the original spacer dimensions, yes please :)
In the meantime I'm waiting on my 4" (100mm) spindle, to have all components ready for an upgrade (bearings + spindle).
Bearings are already waiting.
About the plastic or some softer/elastic material or hard metal spacers, I'm not a metallurgist as well, and don't kno what the barings itself can absorb or give back when needed, it seems logical to me, but the temperature size variations might be compensated by the tapered bearing, which has hollow cones and i read. Maybe you need absolute stiffness for a lathe, and therefore no soft plastic.
Thank in advance for the dimensions.
Arjan
John Rudd:
Ohhhhhh.......
Finally got round to it....
The thickness of the spacer is 11.08mm.....That is the original spacer thickness....
Apologies for the belated reply....
Meldonmech:
Hi John
Well modded, should make a big difference
Cheers David
iafilius:
--- Quote from: John Rudd on December 26, 2013, 10:03:13 AM ---Ohhhhhh.......
Finally got round to it....
The thickness of the spacer is 11.08mm.....That is the original spacer thickness....
Apologies for the belated reply....
--- End quote ---
John and others. Ut took some while for me to get the right materials (bearing puller stuff), and now with my spindle detached, thinking on the subject shielding the tapered bearing.
The dust cap will keep the worst out probably, but like a seal more.
It seems the dust cover is build to hold a seal. I ordered 48x3 , 48x3,5 and 48x4 (mm) nbr o-rings to see if i can get it sealed and fit. If that works i consider to create a new spacer with a diamer of 48 too, to be able to use the same construction. That spacer needs to be shortened or re-created anyway.
What do you think?
Regards,
Arjan
steampunkpete:
My default choice for grease would be a moly-grease. What did you use john?
With regard to the bearings: For almost all applications that use two bearings (ball or taper) the rule is that one inner or one outer must have axial float. In the case of ball-races this is to prevent axial loading which the bearings are not intended to withstand. For taper bearings it is to permit the pre-load to be set (as has been rightly stated in this topic already). There are some odd exceptions to this rule for certain applications. When the Triumph Bonneville was made by the Meriden Cooperative, they redesigned the rear-wheel to take a disc brake. The wheel hub was re-designed with two ball races and no float anywhere. As a consequence the life of the rear-wheel bearings was less than 3000 miles. It was a pig's ear design with no easy remedy.
I have seen a mini lathe webpage dealing with a bearing change that suggests a 38mm x 4mm O-ring for an additional seal on the spindle. I have the bearings and O-rings ready to go and have acquired the purpose designed LMS extractor kit. The job will, however, have to wait until I've re-vamped the garage.
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