Facing a BB without threads?
09-11-20, 03:14 AM
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Facing a BB without threads?
I've been researching a bit but haven't found an answer yet. If you have a BB without threads or with non-standard threads, how would you go about facing it? All the tools I've seen use _threaded_ inserts and a spring to provide the tension needed to shave off the metal. Am I missing something here?
Cheers,
Phillip
Cheers,
Phillip
09-11-20, 04:16 AM
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I don't really know, but, perhaps pressed fit bb does not need the shell faced. Have you checked youtube for video? Or maybe www.parktools.com for info. Ask an LBS.
09-11-20, 05:08 AM
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09-11-20, 05:09 AM
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A centering cone is used on the opposite side and a pilot bushing is used on the side being faced. As seen in the picture on this Park tools page. https://www.parktool.com/product/40-98mm-pilot-764
If the bottom bracket requires reaming also, the reamer takes the place of the bushing, as is done with reaming and facing a head tube.
If the bottom bracket requires reaming also, the reamer takes the place of the bushing, as is done with reaming and facing a head tube.
09-11-20, 07:42 AM
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You face a threaded bottom bracket to assure the thread in cups have flat and parallel surfaces to tighten against. Most non-threaded bottom brackets use pressed-in bearings and the outside faces of the bb shell don't locate them so facing isn't needed.
Last edited by HillRider; 09-11-20 at 07:48 AM.
