Hi Rick,
Consider this:
1. start w/ standard nut, drill out threads w/ clearance drill or slightly larger.
2. cut in half as before
3. file at saw cut till you get tap size measurment across hole pupendicular to saw cut.
4. clamp nut halves together & tap threads. Damn, the tap won't stay centered, and I was doing so well. Might be able to cuck nut halves in 3 jaw and cut threads on larger sizes?
5. file some more along saw cut for clearance so you can measure undersized thread.
I guess that idea fizzled at step 4, but was trying to eliminate the cross drilling.
CT2
--- In gingery_machines@yahoogroups.com, "RG Sparber" <rgsparber@...> wrote:
>
> CT2,
>
> Good suggestion.
>
> Now you got me thinking - having the nut cut in half is good because it
> helps to keep the halves on the bolt as you bring it to the mic. But all of
> that thread contacting the bolt is bad because you don't know for sure where
> it is touching.
>
> Ideally I would want a bolt with a hole slightly greater than the major
> diameter but have two thin blades opposing each other with the thread cross
> section similar to the anvils of a thread mic.
>
> Assuming I can find a drill with the correct diameter, cutting the major
> diameter would be easy.
>
> I could then cross drill and tap a smaller hole on the radial centerline.
> Thread in a short section of threaded rod into each side that extends into
> the major diameter hole down to a few thou more than the pitch center but is
> below the surface of the outer flats. Loctite the rod in place.
>
> Then run a tap which will only cut threads into the ends of the threaded
> rod.
>
> Since I'm making the nut anyway, I could add a loose fitting guide pin that
> will keep the two halves connected yet not be hit by the mic nor interfere
> with alignment.
>
> If the above is not clear, please let me know and I will draw it up.
>
> Rick
>
> -----Original Message-----
> From: gingery_machines@yahoogroups.com
> [mailto:gingery_machines@yahoogroups.com] On Behalf Of Brite
> Sent: Tuesday, August 23, 2011 10:34 PM
> To: gingery_machines@yahoogroups.com
> Subject: [gingery_machines] Re: new article: A Possible Means of Measuring a
> Thread's Pitch Diameter
>
> I liked this idea from th moment you suggested it, Rick. When cutting
> threads, might have to use smaller sections, maybe 2 "thirds" rather than 2
> "halves", but I'm going to try to remember this one!
>
> CT2
>
>
>
> --- In gingery_machines@yahoogroups.com, "RG Sparber" <rgsparber@> wrote:
> >
> > This article presents a possibly new way to measure a thread's pitch
> > diameter using a common hex nut. I am presenting data that hints that this
> > may work but this is far from being a proof nor does it follow solid
> > metrology procedures.
> >
> >
> >
> > The central idea is to emulate the inserts used on a thread mic by using
> the
> > halves of a hex nut.
> >
> >
> >
> > If you are interested, please see
> >
> >
> >
> > http://rick.sparber.org/mpd.pdf
> >
> >
> >
> > Your comments and questions are welcome. All of us are smarter than any
> one
> > of us.
> >
> >
> >
> > Rick
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
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