In this video I design and build a universal indexing attachment for the lathe utilising an expanding mandrel and some 3D printed index plates. This I will be using in future videos to machine the graduations needed for dials etc. This design should work on most lathes with a hollow spindle bore and will be sharing it with my Patreon supporters;

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Timestamps
0:00 Introduction
0:17 What problems do we need to solve?
01:10 Design
02:59 Machining the expanding mandrel
10:53 Drilling the bolt hole pattern
12:45 Milling the slots
14:23 Making the standoff
14:42 Making the cone
15:25 Indexing plates
16:23 Installing and use
18:08 Testing
19:54 Conclusion