Machining a motor coupling for a big generator

[MWF FEED]

This time the coupling is for my neighbour who is building a big generator to be used during blackouts.
The material that was given to me for machining this part proved to be a gateway to an ordeal to say the least.

In this video I am using (https://youtu.be/51CMJHCBABI):
- Weiler Matador SV (1972) Lathe
- Schaublin SV-51 (1955) Milling machine
- Solberga (1975) Drill press
- Kemppi MasterTig MLS 2000 Welder
Attached Images

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https://metalworkforums.com/images/attach/jpg.gif Shot2.jpg (https://metalworkforums.com/attachment.php?attachmentid=400742&d=1669712120) (140.4 KB)
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https://metalworkforums.com/images/attach/jpg.gif Shot4.jpg (https://metalworkforums.com/attachment.php?attachmentid=400744&d=1669712120) (191.7 KB)
https://metalworkforums.com/images/attach/jpg.gif Shot5.jpg (https://metalworkforums.com/attachment.php?attachmentid=400745&d=1669712120) (164.8 KB)
https://metalworkforums.com/images/attach/jpg.gif Shot6.jpg (https://metalworkforums.com/attachment.php?attachmentid=400746&d=1669712120) (150.4 KB)
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