On 02/07/2016 02:15 PM, andy pugh 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. > I restored a 75mm Krupp that had a similar stepped cut to the breach. The Krupp was not a true thread as the grooves had no lead and the breach block was tapered so that you did not have to retract the breach block after unlocking, you simply swung the block out of the way to eject and reload. In this case a rotary shaper would be the handiest tool to cut the grooves.
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