[modeleng] Re: Pistons was 3½ vs 5, Sweet Pea
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Mon, 26 Sep 2005 14:30:20 -0700 (PDT)
Harry, down at the County Jailhouse Maintenance Dept.,
we called them "Security Screwdrivers"--Spanners to
our British brethern.
Al Messer
--- Harry Wade <hww@xxxxxxxx> wrote:
> At 09:27 PM 9/26/05 +0100, you wrote:
> >Works on the 12" to the ft scale ok John, why not
> in 5" - Dave
>
> I have never known of a single instance where
> a threaded piston
> connection (meaning for anything other than
> retaining nut), was used in
> full size. Certainly there may very well have been,
> but it would have been
> the extreme exception rather than the rule.
> IF you intend to use a fully threaded
> connection, and I've done so
> myself (but won't again), the thing to do is start
> the thread in the lathe
> (between centers, in collet, or indicated in a
> 4-jaw) with a single point
> tool. This assures axial alignment (&
> concentricity) of the thread form,
> and you have the option of running on a die for
> final shaping. Then, more
> importantly, the piston should be finish turned to
> final OD on the rod
> between centers to insure concentricity between the
> rod and piston OD. On
> my current loco project I intend to use a short
> tapered shank retained by a
> recessed nut as described next.
> Another question . . . I cannot for the life
> of me remember the name
> of the type of nut & spanner combination where the
> nut has two holes
> drilled in the face and the spanner is adjustable
> with studs which fit into
> the holes. Refresh my memory?
>
> Regards,
> Harry
>
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