[modeleng] Re: [modeleng] Pistons was 3½ vs 5, Sweet Pea
- From: "Jeff Dayman" <jeffdayman@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 26 Sep 2005 20:04:32 -0400
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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