Why not make them from steel DIN2541-03 (translate
to SAE) and you can surface harden them if necessary.
Thomas
Gary K. McCormick wrote:
> Yes, they could - and that would be the way to go for low-volume
>manufacturing. The
> originals appear to be cast steel, and it would be economically unfeasible to
>produce the
> cast steel blanks for the volume we are talking about, so machining from a
>suitable steel
> alloy, with area hardening for the teeth and bore, would be the way to go. It
>would be
> helpful to get an idea of the properties of the material from an original
>set, i.e.,
> hardness, etc.
>
> Gary McCormick
> San Jose, CA
>
> sidney raper wrote:
>
> > OK, I know virtually nothing about what I am about to ask, but why couldn't
> > a unit be milled out of billet steel and heat treated? I cannot imagine
> > that it would cost the obscene money that the stock units are getting.
> >
> > Sid
> >
> > >From: "Gary K. McCormick" <svgkm@halley.ca.essd.northgrum.com>
> > >Reply-To: "Gary K. McCormick" <svgkm@halley.ca.essd.northgrum.com>
> > >To: datsunmike <datsunmike@nyc.rr.com>
> > >CC: Brian Rourke <bbtmc@ozemail.com.au>, datsun-roadsters@autox.team.net
> > >Subject: Re: Timing gears...again.
> > >Date: Thu, 16 May 2002 07:00:04 -0700
> > >
> > >I believe he is talking about newly fabricated sprockets, not
> > >retro-treating existing
> > >units.
> > >
> > >Gary McCormick
> > >San Jose, CA
> > >
> > >datsunmike wrote:
> > >
> > > > I do believe the gears are already hardened. You could try the freeze
> > >method
> > > > which is supposed to make parts last longer.
> > > >
> > > > Mike
> > > >
> > > > ----- Original Message -----
> > > > From: "Brian Rourke" <bbtmc@ozemail.com.au>
> > > > To: <datsun-roadsters@autox.team.net>
> > > > Sent: Wednesday, May 15, 2002 10:19 PM
> > > > Subject: Timing gears...again.
> > > >
> > > > > I know that a local 2000 sports specialist here in OZ is talking about
> > > > > experimenting with hardened alloy sprockets for the U20 engine. Should
> > >be
> > > > > interesting to see the results....
> > > > >
> > > > > Cheers all, Brian Rourke 1970 2000 solex.
> > > > >
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