[modeleng] Re: [modeleng] Pistons was 3½ vs 5, Sweet Pea

I just call that a pin nut or face nut and pin spanner.

Cheers Jeff Dayman


----- Original Message -----
From: "Harry Wade" <hww@xxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Monday, September 26, 2005 5:13 PM
Subject: [modeleng] Pistons was 3½ vs 5, Sweet Pea


> 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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