Making a Custom Die on the Proxxon PD 250/e Lathe

Making a die is the natural counterpart to making a tap, and is the reason I made my shop made tap in the first place. The custom slideway threads on my G Boley watchmakers lathe are an unusual geometry, but are damaged, and I need to chase them with a die to clean up the form. I researched the techniques involved from books and YouTube videos, and took the shop made tap out for its first real work.

The thread in question is a left hand 4mm by 0.6mm pitch with a 55 degree angle. It predates most modern thread standards, and is not compatible with any older standards I can find. This video is the first time my tap has ever cut steel.

OnShape Model: http://bit.ly/2JBwnTu

The links below will financially support this channel if you use them to buy stuff:

Machines:
Proxxon PD 250/e Lathe (24002) - https://ebay.us/w9X2nv
Proxxon FF 230 Milling Machine - https://ebay.us/bLYDr3

Tools:
CCMT External Lathe Tool - https://ebay.us/S5zvA4
4mm Solid Carbide Square Nose End Mill - https://bit.ly/3YhP96C https://ebay.us/zeQpNv
MAP/Pro Gas Cylinder - https://ebay.us/B1e5xU
Pizza Oven Bricks - https://ebay.us/Vnofhm

Materials:
BS1407 Silver Steel, 20mm precision ground round bar - https://ebay.us/WNeecN

Music:
Easy Lemon by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/