skiboyracing
Member
- Jan 22, 2006
- 85
- 0
whenfoxforks-ruled said:How do you rotate the case to knurl it? Surely there is no way of turning that tool in a circle to achieve the knurl, so the case must spin? QUOTE]
foxforks.
You use a vertical mill and a graduated boring head. The boring head is indexed off of the original bearing boss ID just as though you were going to bore the ID bigger. But, instead of using a cutting tool, you use the knurling tool.
I see that as only a temporary fix since the bearing boss will only have partial surface support after knurling. The force of the crank will eventually pound the high surfaces down and the bearing will loosen again.
I would find a new set of cases and be sure to heat the cases when you install or remove the bearings. This will eliminate loose bearing bosses in the future.
whenfoxforks-ruled said:then why not put a sleeve in it?
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