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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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<blockquote data-quote="Cyborg" data-source="post: 86869" data-attributes="member: 3426"><p>Well checking it on the lathe would certainly be easier and cheaper given the fact that I don't have the knife edges. Interesting subject the "between centres vs knife edges". TP told me when discussing one of his new cranks that "the crank cannot be checked between centres on a lathe, only on knife edges close to the inner bearings as the grinding process does not use the centres and they could be out". I mentioned this to one of the local gurus (who is retired and only works on his own projects) and he just looked at me like I had two heads. He said just set the crank up in the lathe and if the centres aren't centred, then just centre them with the grinder. Not sure why I was leaning towards knife edges. Maybe it was the fact that they made a special tool just for that purpose.... or I'm just a shitty student and wasn't listening to the guru.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 86869, member: 3426"] Well checking it on the lathe would certainly be easier and cheaper given the fact that I don't have the knife edges. Interesting subject the "between centres vs knife edges". TP told me when discussing one of his new cranks that "the crank cannot be checked between centres on a lathe, only on knife edges close to the inner bearings as the grinding process does not use the centres and they could be out". I mentioned this to one of the local gurus (who is retired and only works on his own projects) and he just looked at me like I had two heads. He said just set the crank up in the lathe and if the centres aren't centred, then just centre them with the grinder. Not sure why I was leaning towards knife edges. Maybe it was the fact that they made a special tool just for that purpose.... or I'm just a shitty student and wasn't listening to the guru. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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