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How tight should Crank Arms be on Shaft?

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Clean:
Peeps,

A quick nOob question; should my Crank Arms fit easily onto the shaft, do they need a little "assistance" or do they need twatting on?   ???

Worried that if it is the latter I may have the wrong shaft for the arms.  :(

Are all OS Bits configured with a square, very slightly tapering, interface between the arm and shaft?  :-\

All input gratefully received.  :daumenhoch:

Thanks,

Clean.

HUTCHMAN:
with a square taper,just place the crank arm onto the spindle then tighten the spindle nut/bolt till tight.

Clean:

--- Quote from: HUTCHMAN on May 02, 2011, 05:12 PM ---with a square taper,just place the crank arm onto the spindle then tighten the spindle nut/bolt till tight.

--- End quote ---

Tried that. Arms go on about 1/4 of the way then become immovable. Tried "encouraging" them with a knocking stick but got nervous so stopped.  ::)

Upon removing the arm I can see light scraping on the taper and square hole which, to me, suggests that there may be a mismatch?  :-\

HUTCHMAN:
yes,tapers sound totally different.

Clean:

--- Quote from: HUTCHMAN on May 02, 2011, 05:40 PM ---yes,tapers sound totally different.

--- End quote ---

 :'(

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