[modeleng] Re: Pistons was 3½ vs 5, Sweet Pea
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Mon, 26 Sep 2005 17:01:46 -0700 (PDT)
Harry, I must confess to threading the piston rod the
full length of the piston plus the height of the nut.
If this is improper practice, what diameter shoulder
should be allowed for the piston to butt against? And
I do agree that the piston should be finish turned on
its own individual rod.
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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