Andy,
I saw a 60 taper machine in storage here in Wichita.
It was from an arsenal.
The machine was huge. I would think it could cut the threads with a thread
mill or single point tooling with the size of the adapter.
I had never imagined an adapter that size.
The attached picture shows a comparison between 50 taper adapters (in the
man's hand) and 60 taper adapters in the box. The picture is not of the
machine here. It is just an example I found on the internet.
The link also shows dimensions in the chart at the bottom of the page.
Large, heavy, grown  equipment.

http://parlecparts.com/pages/cat_taper_toolholders

thanks
Stuart


On Sun, Feb 7, 2016 at 2:15 PM, andy pugh <bodge...@gmail.com> wrote:

>
> https://en.wikipedia.org/wiki/Welin_breech_block#/media/File:Sailor_looking_into_the_breech_of_16_inch_gun_aboard_USS_Alabama_(BB-60).jpg
>
> I suspect an extremely specialised machine for the internal version.
>
> --
> atp
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