Vertical shear finishing tool for the lathe - video

[NortonDommi]

I have a couple of those Eccentric Engineering tangential tools and find they do an excellent job as a shear tool when used in reverse i.e. with a RH tool instead of running towards the headstock cut towards the tailstock and vice versa for a LH tool.
The bit could also be turned through 90 degrees to achieve the same result, I have been means to make a dedicated tool though.

[tonyfoale]

I have a couple of those Eccentric Engineering tangential tools and find they do an excellent job as a shear tool when used in reverse i.e. with a RH tool instead of running towards the headstock cut towards the tailstock and vice versa for a LH tool.
The bit could also be turned through 90 degrees to achieve the same result, I have been means to make a dedicated tool though.

I made an indexable carbide tip version by machining the sides of the tool holder to 15 deg. There is a full description here

Shear tools for lathe work.

Click image for full size.