[simpits-tech] Threads. HATE 'EM.

[Cris Harrison]

hey g
maybe this will help?? http://mdmetric.com/tech/M-thead%20600.htm

On Wed, Jan 23, 2013 at 3:12 PM, geneb <geneb at deltasoft.com> wrote:
> I'm trying to construct a 3D model of an M36x2 thread.  For the curious,
> that's the thread used by the TM Warthog and F-16 stick grip assemblies.
>
> In order to correctly build the model that I can then in turn print, I
> need to know how big the thread needs to be and what the diameter is of
> the surface I'm either cutting thread into or attaching it to.
>
> >From what I've read, metric threads have a 60 degree angle to them.
>
> The formula I found (http://www.metrication.com/engineering/threads.htm)
> seems to say that the total height of the thread is 0.866 * P where P is
> the pitch of the thread (2mm in this case).
>
> So theoretically, my thread depth/height would be 1.732mm.  Correct?
>
> When I measure the threaded base of my Warthog, I get a diameter of 35.82
> or so.  Pretty close to the 36mm I'd expect when you account for the
> designed-in flattening of the thread apex.
>
> So in order to create external threads, should I start with a "post" with
> a diameter of 34.268 and then add the threads to that?
>
> For internal threads, would it be a hole 36mm and then cut the thread into
> it using a 60 degree triangle, 1.732mm tall?
>
> Thanks!
>
> g.
>
> --