Have the person with the lathe use it to externally thread a length of metal so
it will screw into something he already has to screw onto the spindle. Then he
can ship that to you to use for a fit testing piece.
On Friday, July 31, 2020, 4:26:20 AM MDT, stjohn gold
<thesaint4...@gmail.com> wrote:
Hi Andy,
great post, thanks! It all goes to show that threads are complicated. Some
of those standards were written over a period of 20 years, that is no joke.
Nothing to physically test your fit against - brave!
cheers, St.john
On Thu, Jul 30, 2020 at 9:54 PM andy pugh <bodge...@gmail.com> wrote:
> (Or "Why do I always take 4 goes at a fit with G76")
>
> I recently had the occasion to think harder than normal about threads,
> and especially about their sizing and fits.
> Threads were one of the very first things to be standardised and made
> interchangeable, largely through the work of Josiah Whitworth. And it
> turns out that they are one of the more complicated things to
> standardise.
> The reason I was thinking about this was that I was trying to make a
> lathe faceplate for someone a few hundred miles away. I know that his
> spindle nose is 2 1/4" BSF. (ie, one of Whitworth's threads) but have
> nothing to use for a trial fit.
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