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Re: MGC & Crank Pulley: Greater Specifidity

To: mgs@Autox.Team.Net (mgs)
Subject: Re: MGC & Crank Pulley: Greater Specifidity
From: todd@nutria.nrlssc.navy.mil (Todd Mullins)
Date: Thu, 10 Apr 1997 09:28:28 -0500 (CDT)
Rich Mason writes:

> I thought it was a well established fact that RCH was much finer than BCH.
> Maybe a survey is in order?

It's my understanding that the main difficulty with RCH is the
temperament.  The manufacturing process for RCH uses very stringent
tolerances, such that the slightest miscalculation during production
disrupts the entire process, sometimes so severely that an entire batch
of RCH must be discarded, and a new process begun after cool-down.

BCH, on the other hand, are relatively easy to come by, both due to
their abundance in nature and the fairly simple harvesting procedure.
Such a plethora of specimens means that you'll find widely varying BCH
specifications from manufacturer to manufacturer.  Most machinists use
BCH to "rough out" a project, then switch to RCH for final honing.  When
selecting a shop for your project, ask to see a sampling of the BCH and
RCH they use.

-- 

Todd "Uh-oh" Mullins
Todd.Mullins@nrlssc.navy.mil    On the lovely Mississippi (USA) Coast

'74 MGB Tourer in pieces, like me

(witty quote here)

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