Re: BB86 reamer/facer?
park tool #752 BB30 reamer and have it reduced / reground by a reputable tool grinding shop ? (needs to be 41.0 +0 -0.05mm)
that way you can use #690 or #690XL depending on the OD of the shell to face in a single pass (may need a spacer for extra cutting depth)
don't forget the bevel on the inside of the shell, 1mm +-0.5mm at 45 degrees is usual, but necessary for the bb to sit against the faces of the shell because of the small radius on the internal corner of the BB itself
just a thought
best of luck
NBC
Last edited by NBC; 06-26-2014 at 01:14 PM.
Reason: extra info
Nathan B Colman
cyclist, amateur framebuilder, campanologist, and general lover of old trains, planes, bikes, cars etc !
Bury St Edmunds, Suffolk, England :)
Bookmarks