How is this done

[dogooder]

Well of course! The 19th C copy gunstock was only as good as the master!

Dave.

I think he is talking about a manual tracer lathe but not sure. I don't believe there were any tracer lathes in the 19th century. I have run huge overhead belt
driven lathes made by the Gisholt machine manufacturing corp. I was turning 14 foot long seven inch diameter drive shafts in the eighties on a lathe from
1898. A side note. I worked for a company who built the stepdown transformers you see on the poles for homes. This was around 2000 to 2005. The blueprints
were from 1929, copies from earlier ones, nothing had changed.

 

[ecc83]

It was only a guess about the 19th century but...https://en.wikipedia.org/wiki/Thomas_Blanchard_(inventor)#Machine_tools_for_gun_making_and_pattern_copying_lathe
I was pretty bob-on!

We don't have 'Pole Pigs' over here we have huge "substations" huge transformers in buildings the size of a house that serve an area of several streets. If you start at NN5 5PF in Google and pan left to "Duston Road" there is a really BIg Mother!

Dave.

 

[dogooder]

It was only a guess about the 19th century but...https://en.wikipedia.org/wiki/Thomas_Blanchard_(inventor)#Machine_tools_for_gun_making_and_pattern_copying_lathe
I was pretty bob-on!

We don't have 'Pole Pigs' over here we have huge "substations" huge transformers in buildings the size of a house that serve an area of several streets. If you start at NN5 5PF in Google and pan left to "Duston Road" there is a really BIg Mother!

Dave.

This is the largest machine I have ever worked on. It is in a shop in Denver. A Carlton 6HC, 60 foot of travel in the X, 20 foot of travel in the Y and 8 foot of spindle extension. The way covers are covering the railroad tracks it rides on. I would mill jet engine test stands. Did a yoke for a forty inch telescope. We had a rotary table for it that you could drive a car up on.